canonical · 3.2 personacapability

Developer Tools

Score 38.6 / 100 1067 providers +41 via APIs 214 APIs Search apis.io →

Variants seen in the corpus: Developer ToolsDeveloper-Toolsdeveloper toolsdeveloper-tools

Providers using this tag (1067)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 22 Complete, well-documented, and agent-ready

AhaSendEmailTransactional EmailSMTP2 APIs82.3 LaunchDarklyFeature FlagsFeature ManagementExperimentationObservability3 APIs77.9 DrippayCompanyBillingUsage-Based BillingMetering1 API76.1 PlunkEmailTransactional EmailMarketingAutomation2 APIs74.6 RedoclyArtificial IntelligenceAPI CatalogAPI DocumentationArazzo12 APIs74.6 PostmanAI Agent BuilderAI AgentsAPI CatalogAPI Client21 APIs72.5 MailboxlayerEmailEmail VerificationEmail ValidationSMTP2 APIs71.9 Blnk FinanceFintechFinancial-ServicesLedgerdouble-entry-accounting1 API71.8 GiteaGitSource ControlDevOpsCI/CD2 APIs71.7 AkuityGitOpsContinuous DeliveryKubernetesArgoCD8 APIs71.5 StoplightAPI DesignAPI DocumentationAPI GovernanceAsyncAPI2 APIs69.7 LoopsEmailEmail APIMarketing AutomationTransactional Email1 API69.1 PrismicGraphQLHeadless CMSContent ManagementPage Builder8 APIs68.9 MailosaurEmail TestingSMS TestingQA Automation1 API68.8 Edge ImpulseArtificial IntelligenceMachine-LearningEmbedded Machine LearningEdge AI2 APIs68.0 Azure DevOpsAgileCI/CDDevOps11 APIs67.4 ButtondownAnalyticsAutomationsEmailMarkdown1 API67.3 GitHubCodePipelinesPlatform38 APIs67.3 NetlifyCDNCloudContinuous Deployment2 APIs67.3 APILayerAPI MarketplaceAPI CatalogAPI Discovery3 APIs67.0 API EvangelistAPI EvangelistDeveloper PortalAPI ResearchAPI Governance2 APIs66.9 CloudBeesCI/CDContinuous DeliveryContinuous Integration3 APIs66.6

Strong 80 Solid coverage with minor gaps

Developing 302 Usable, with meaningful gaps to close

Thin 313 Limited public surface area

Emerging 244 Early or largely undocumented

Minimal 81 Almost no public developer surface

Unrated 25 Not yet scored

AirplaneCompanyInternal ToolsWorkflows AppBistroCompanyFacebookApp MarketplaceSocial-Media BinarisCompanyServerlessFunctions as a ServiceFunction-as-a-Service BinpressCompanySource Code MarketplaceSDK BlueStripe SoftwareCompanyApplication Performance ManagementAPM DevOpsAutomationCI/CDConfiguration ManagementContainers DigitalkCompanyEnterprise SoftwareProgramming Languages DistelliCompanyDevOpsDeploymentContinuous Delivery DivshotCompanyWeb HostingStatic HostingFrontend ElasticBoxCompanyCloudMulti-CloudApplication Deployment Engine MLCompanyArtificial IntelligenceMachine-LearningMLOps FimioCompanyWeb3Fraud Detection FleksyCompanyKeyboardSDKMobile FusebitEmbedded iPaaSIntegrationServerless2 APIs General Galactic CorporationCompanyWeb3EthereumBlockchain InVisionAppCompanyDesignProduct DesignPrototyping justyoCompanyNotificationPush NotificationsMessaging1 API Kimono LabsCompanyWeb ScrapingData Extraction LytmusCompanyHiringRecruitingTechnical Interviews REST APIArchitectureHTTPWeb ServicesREST Rome ToolsCompanyJavaScriptTypeScript StamplayCompanyBackend-as-a-ServiceAPI IntegrationLow-Code SuborbitalCompanyWebAssemblyEdge Compute test.aiCompanyTestingTest AutomationQuality Assurance2 APIs ThundraCompanyObservabilityServerlessAPM

APIs with this tag (212)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 4 Complete, well-documented, and agent-ready

Mailboxlayer Email Validation APIREST/JSON API for real-time email validation: syntax check, typo suggestions, MX-record lookup, SMTP verifi...71.9 Blnk Cloud APIManaged Cloud REST surface covering OAuth auth, a Proxy API to a Core instance, Data API, Filters API, Aler...71.8 Blnk Watch APIRule-based transaction monitoring API (transaction evaluation, instruction management, Git-backed rule sync...71.8 Prismic Types APIThe Types API reads and writes a repository's content models — custom types and Slice Machine shared slices...68.9

Strong 27 Solid coverage with minor gaps

TranscriptFetch REST APIREST API (current version v2, path-prefixed) for fetching timestamped transcripts from YouTube, TikTok, Ins...64.7 Renderwolf APIProduction REST/JSON rendering API: screenshots, PDFs, templated images, QR codes, video, site previews, si...64.5 Cracked APIREST/HTTP API to discover, inspect, run and poll third-party agent tools, with smart-run capabilities, lead...64.0 Singular Testing Console APIBETA integration-testing API. Register a real test device to open a one-hour logging session, then read bac...63.0 TempMailGrab REST APIVersioned v1 REST API for creating private disposable inboxes, reading parsed messages with extracted OTPs ...62.6 Lacuna Account APIFree introspection of the calling credential — account id, subscription plan, credit balance (subscription ...62.1 Lacuna MCP ServerHosted Model Context Protocol server (Streamable HTTP) at https://www.lacuna.fm/mcp, protocol 2025-06-18. i...62.1 .NET CLICross-platform command-line interface for developing, building, running, and publishing .NET applications. ...60.9 Waxell Developer MCP ServerWaxell Developer MCP is a hosted Model Context Protocol server that lets coding agents (Claude Code, Cursor...60.8 Ablo Integration-Helper MCP ServerA public, anonymous, stateless Streamable-HTTP MCP server Ablo runs on its own domain so an AI coding assis...59.9 Chainstack Faucet APIPublic Chainstack-operated testnet faucet for Hoodi, Sepolia, BNB Testnet, zkSync Testnet, Scroll Sepolia, ...59.5 Fasten ToolboxStandalone FHIR-based developer tools derived from the main Fasten platform, including catalog browsing, di...58.8 APIFreaks MCP ServerOfficial first-party Model Context Protocol server (Apache-2.0) exposing 59 read-only tools across 13 categ...58.2 Kong InsomniaKong Insomnia is an open-source API development platform for designing, debugging, and testing APIs. It sup...58.0 Amazon Q Developer in Chat Applications APIAPI for Amazon Q Developer in chat applications, which enables integration of Amazon Q Developer capabiliti...57.6 Keploy Cloud APIREST API for Keploy Cloud (base https://api.keploy.io/client/v1) providing AI test-suite generation and exe...57.6 Keploy MCP ServerHosted, remote Model Context Protocol server (streamable HTTP, bearer kep_ PAT auth) at https://api.keploy....57.6 Pagesnap APIREST API converting public URLs to Markdown, text, HTML, JSON, ARIA trees, screenshots, PDFs, link-preview ...57.1 Safari Developer Tools APIAPIs and tools for inspecting, debugging, and optimizing web content in Safari, including Web Inspector and...57.1 Formboost Form Submission APISingle public unauthenticated HTTP endpoint (POST https://formboost.app/f/{alias}) that accepts JSON or for...56.4 Deployxa PlatformAI-first autonomous cloud deployment platform API. The published OpenAPI 3.0.3 contract covers project crea...56.0 x402 List APIPublic REST API (OpenAPI 3.1) providing access to the x402 services directory, uptime, pricing, facilitator...55.9 Treblle Aspen API TestingAspen is Treblle's intelligent API testing application for macOS featuring AI-powered capabilities through ...55.8 CrawlGraph MCP ServerHosted remote Model Context Protocol server at https://crawlgraph.com/mcp over Streamable HTTP, plus an ope...55.3 Temenos Explorer APIAPIs for the Temenos Explorer framework, providing an API gateway for server-to-server API calls with Keycl...55.1 API League PlatformThe API League Platform exposes 55 read-only GET operations across twelve categories: Books (2), News (3), ...54.9 Kore.ai Arch MCP ServerA stdio Model Context Protocol server, @koreai/arch-mcp-tools, that exposes the Kore.ai Agent Platform cont...54.7

Developing 45 Usable, with meaningful gaps to close

Encore MCP ServerEncore ships a built-in Model Context Protocol server (`encore mcp start` for SSE, `encore mcp run` for std...54.0 Warp Enterprise Analytics APIThe Enterprise Analytics API provides team usage metrics and administrative insights for Enterprise plan cu...54.0 Warp Oz CLIThe Oz CLI is a command-line interface for interacting with the Warp Oz agent platform. It allows developer...54.0 JayeXJayeX is a customizable cloud developer tool suite hosted by the Continuous Delivery Foundation that provid...53.5 crob.at REST APIPublic REST API to create and retrieve Pokémon Showdown team links, generate random teams, and access sampl...52.0 Anaconda MCPAnaconda's Model Context Protocol surface for AI coding agents. `anaconda-mcp` is a unified local gateway t...51.8 macadress.com APIREST/JSON API for single and batch MAC/OUI lookups, vendor directory search, and health checks. Requires a ...51.4 Aeternity Middleware APIae_mdw, the æternity middleware (v1.108.2) — an indexing layer over the node exposing 76 unauthenticated RE...50.5 Evaluation APIHigh-performance feature flag evaluation service for SDKs, with client and SDK endpoints for evaluation, id...50.1 Management APIProgrammatic access to Featureflip — projects, environments, feature flags, variations, targeting, segments...50.1 MCP Server (local)Documentation for the @featureflip/mcp server, a local stdio process run via npx that calls the Management ...50.1 Knative CLI (kn)The Knative CLI (kn) provides a command-line interface for creating and managing Knative resources includin...49.9 Spec Scoring APIPublic, no-auth REST API for scoring OpenAPI documents. GET /api/review/checks returns the full set of chec...49.5 WordPress VIP Platform APIThe GraphQL API for WordPress VIP, Automattic's enterprise WordPress and Node.js platform. Documented opera...49.5 WordPress.com MCP ServerAutomattic's hosted Model Context Protocol server for WordPress.com. Streamable HTTP transport secured with...49.5 Scalar Agent and MCPAI layer that lets developers chat with an API inside the docs and exposes hosted MCP (Model Context Protoc...49.4 Scalar API ClientFully open-source, offline-first API client built on the OpenAPI standard - a Postman/Insomnia alternative ...49.4 Scalar CLIOpen-source command-line tool (@scalar/cli) for validating and linting OpenAPI documents (Spectral rules), ...49.4 npm CLIThe npm CLI is the official command-line interface for the npm package manager, providing developers with t...49.3 Meta Agent Tools APIREST/HTTP API for a registry of MCP servers, agent skills and plugins — public catalog search, publishing/e...48.9 RWTH GitLab REST API (self-hosted)The RWTH IT Center self-hosts a GitLab instance at git.rwth-aachen.de used across the university's institut...48.5 Jam MCP ServerHosted Model Context Protocol server that pipes a Jam's recording, console logs, network requests, user eve...48.3 Media Caption Public APIREST API for fetching public YouTube transcripts synchronously and in bulk, with account/balance endpoints,...48.0 TweetAPI Hosted MCP ServerHosted remote HTTP MCP server providing current TweetAPI docs and read-only live public-data tools. Uses OA...47.2 TweetAPI tw-v2 REST APIREST API for public Twitter/X data with X-API-Key auth, JSON responses, and 76 documented endpoints across ...47.2 KUAE Cloud Coding Plan APIAn LLM inference endpoint operated on Moore Threads MTT S5000 GPUs and sold as a subscription for AI coding...46.7 VNC Developer SDKCross-platform SDK for embedding VNC Viewer and Server functionality into applications. Available for C, Ja...46.7 Linktree Arbor RegistryArbor is Linktree's design system, published as a public HTTP component registry. Anonymous, unauthenticate...45.7 Standard Compute Inference APIOpenAI-compatible (and Anthropic Messages-compatible) LLM inference endpoint. Set base URL to https://api.s...45.3 anew Write/Read APIREST/HTTP API to encode self-contained HTML into shareable URLs (POST /write) and read pages back (GET /{sl...44.3 wasmCloud wash CLIwash (WAsmcloud SHell) is the comprehensive command-line tool for developing, building, deploying, and mana...44.3 Sideko CLIThe Sideko CLI is a Rust binary (current release v1.6.3, Aug 2025) that provides command-line access to the...43.9 ToAPIs APIOpenAI-compatible REST API covering chat/completions, image generation, video generation, and model listing...43.7 Trellix API ExplorerInteractive API documentation and testing tool for Trellix security products formerly under the FireEye bra...43.6 FreeTTS REST APIREST/JSON API for text-to-speech synthesis, audio and SRT subtitle download, and voice listing. Uses x-api-...42.6 Ciena Emulation Cloud APICiena Emulation Cloud is an open application development environment enabling developers to create, test, a...42.3 Swytchcode Documentation & Agent SurfacesSwytchcode's publicly consumable surfaces: developer documentation and a published llms.txt. The primary in...42.2 TronZap REST APIREST API for TRON Energy and Bandwidth rental, energy subscriptions, and AML crypto checks. Endpoints inclu...42.1 TronZap Wallet Orders APIFully public, unauthenticated Orders API for non-custodial wallet integrations. Four operations — POST /v1/...42.1 PageAudit APIREST/HTTP API for one-shot technical SEO audits plus micro-tools, with a hosted MCP server, llms.txt, and O...41.4 Glia Functions APIGlia Functions is a serverless JavaScript runtime (workerd) inside the Glia platform, with REST endpoints f...41.0 Redis InsightRedis Insight is a free GUI management tool for Redis. Provides database browsing, query execution, memory ...40.6 Stellary MCP ServerHosted remote MCP server (streamable HTTP) exposing board read/write, cockpit supervision, agent runtime, a...39.7 Stellary REST APIREST API at the application root covering auth/identity, organizations/workspaces/projects, delivery (cards...39.7 Spree Dev ToolsInternal developer tooling for working on Spree itself - debuggers, profilers, dummy data generators, and h...39.6

Thin 97 Limited public surface area

Falco Plugin APIThe Falco Plugin API provides a C ABI interface for developing plugins that extend Falco with new event sou...38.9 ReqKey REST APIREST API for API key management, usage credits/metering, rate limiting, and traffic analytics. POST/JSON en...38.8 Image CDNToken-authenticated global image CDN delivering car logos in full, badge, and wordmark variants across mult...38.2 JSON APIBearer-authenticated REST/JSON API for listing brands and retrieving full brand detail including color pale...38.2 MCP ServerHosted streamable-HTTP MCP server exposing read-only brand tools, account tools, resources, and prompts. Au...38.2 Kyverno CLIThe Kyverno CLI provides a command-line interface for applying and testing Kyverno policies against Kuberne...37.8 Triplit CLICommand-line interface tool for scaffolding Triplit projects, running the local full-stack development envi...37.8 Spocket MCP ServerHosted MCP server (Streamable HTTP) with ~20 tools for deploying and managing always-on apps. Uses OAuth 2....37.2 Spocket Platform REST APIWhite-label reseller/provisioning REST API for hosting apps from a customer backend. OAuth2 client-credenti...37.2 Thunder Compute CLI (tnr)The tnr command-line interface is the primary developer surface for Thunder Compute, wrapping the REST API ...36.4 Crank Storyboard APIsThe public API reference for Crank Storyboard, the embedded graphical-interface development platform AMETEK...36.0 Lookip APIREST/HTTP IP intelligence API with LITE and MAX lookup tiers, batch lookups, and keyless public ASN endpoin...35.6 ForgeCode API (Tailcall Inc)ForgeCode is the commercial CLI coding harness product from Tailcall Inc, positioned as an AI-enabled progr...34.9 Vynaris Gateway APIREST API in OpenAI Chat Completions wire format. Primary endpoint POST /v1/chat/completions with SSE stream...34.6 EasyAR CRS Web Service APIREST/HTTP API for cloud image recognition: target management endpoints (/targets/, /target/, /grade/detecti...34.3 FluentEDI Tools APIStateless HTTP tool API. 50 paths and 99 operations in the served OpenAPI 3.1, no authentication. A failed ...34.0 Bolsai Financial Data APIREST/JSON API for Brazilian financial-market data — equities, FIIs, fundamentals, dividends, financial stat...33.8 SendHQ REST APIResend-compatible REST API for transactional and inbound email, domains, templates, deliverability, and wor...33.5 WeaveAPI OpenAI-compatible APIOpenAI-wire-compatible REST API for chat completions, responses-style requests and the model catalog, authe...33.2 OgenThe ogen code generator. Invoked as a build-time CLI against a local OpenAPI v3 document — `ogen [options] ...33.1 NJU e-Science Code Hosting (GitLab REST API v4)An institution-operated GitLab instance for NJU staff and students. Its REST API v4 is real and in producti...32.6 Zudoku Configuration APIZudoku is an open-source, developer-first API documentation framework built by Zuplo. It uses a file-based ...31.6 Playground GraphQL APIGraphQL gateway providing stateful mock query and mutation access to the same dataset, with an interactive ...31.5 Playground REST APIFree stateful mock REST API with session-scoped mutation overlays, dynamic collections, media generators, c...31.5 Wormhole CLICommand-line interface for interacting with Wormhole protocol operations including token transfers, NTT dep...31.3 Oapi-CodegenCommand-line tool and Go library that converts OpenAPI 3.0 and 3.1 specifications into Go server-side, clie...31.2 PlanetScale CLIThe PlanetScale CLI (pscale) is a command-line tool that brings PlanetScale database management to the term...31.2 src CLIsrc is Sourcegraph's command-line client for code search, code intelligence, batch changes, and administrat...30.9 StackShare GraphQL APIThe StackShare GraphQL API provides programmatic access to StackShare's database of developer tools and com...30.7 Taxi PlaygroundInteractive web-based editor for writing Taxi schemas and TaxiQL queries with live diagram generation and q...30.2 Stainless CLIThe Stainless CLI generates production-ready command-line interfaces from an OpenAPI specification. Generat...29.4 Push Chain Testnet FaucetPublic testnet faucet at faucet.push.org for the Push Chain Donut Testnet. Delivers 1 PC (native gas token)...28.7 Visual Studio Extensibility APIThe Visual Studio Extensibility API enables developers to create extensions that customize and extend Visua...28.5 Open Explorer MCP ServerHorizon Robotics' hosted Model Context Protocol server for the OpenExplorer toolchain. Probed anonymously o...27.5 QName AI WHOIS REST APIApproval-gated REST API for WHOIS/RDAP lookups: GET /api/whois/{domain} (single), POST /api/whois/batch (ba...27.5 Auggie CLIAuggie is Augment's command-line interface that brings the Augment agent, Context Engine, and tool integrat...27.3 Genql GraphQL APIFully-typed TypeScript client generated from any GraphQL schema, enabling type-safe query building with IDE...27.3 RapidCanvas Platform APIBearer-token REST API behind the RapidCanvas platform and the RC CLI. All CLI interactions are HTTPS calls ...27.1 ReDocReDoc is an open-source API documentation renderer for OpenAPI specifications, originally created by Rebill...27.1 Advanced Schedule Cron APICompute upcoming fire times for a 5-field cron expression. Return next_runs, count, timezone, and the refer...26.8 ApyHub Developer Tools APIThe Developer Tools API from ApyHub — 120 operation(s) for developer tools.26.8 Audit Website SEO APISE Ranking Data API | Website Audit - provides a comprehensive suite of tools to programmatically manage th...26.8 Best Match Text Search APIRanks candidate strings against a source string and returns matches with Levenshtein distance. Useful for t...26.8 Broken Link Checker APIScan a webpage URL and get link statuses, redirect chains, response times, and a summary of broken links fo...26.8 Check Spelling APIDetect misspelled words in text and get correction suggestions. Returns the original input, misspelled word...26.8 Check WCAG Color Contrast APICompare foreground and background colors and get WCAG 2.1 contrast ratio, AA/AAA pass-fail, luminance, and ...26.8 Compare Features & Costs across Cloud ProvidersCloud Server Catalog gives you a searchable inventory of cloud locations and server offerings across provid...26.8 Convert Case & Slug from Text APIConvert text into slug, camelCase, snake_case, and other common cases. Useful for URLs, identifiers, headin...26.8 Convert Color Formats APIConvert a color string in hex, RGB, or HSL and get structured JSON back for palette, accessibility, and for...26.8 Convert Date & Time Formats APIConvert ISO strings, unix epochs, or now into UTC, localized, and relative formats. Returns weekday, week n...26.8 Convert HEX to RGB/HSL APIConvert a HEX color into RGB and HSL values. Useful for design tools, theming, and frontend workflows that ...26.8 Convert Number Bases APIConvert integer strings between bases 2 to 36, with auto-detection for 0x, 0o, and 0b prefixes. Useful for ...26.8 Convert Raw CSV to JSON APIConvert a CSV string into a JSON array of objects keyed by the header row. Get parsed rows in data and a to...26.8 Convert Raw JSON to CSV APIConvert a JSON array of objects into a CSV string with auto-generated headers. Useful for exports, reports,...26.8 Convert Raw JSON to XML APIConvert a JSON object in data to a well-formed XML string, with an optional root tag. Useful for legacy int...26.8 Convert Raw XML to JSON APIConvert XML strings into JSON while preserving attributes and text. Useful for parsing feeds, legacy integr...26.8 Convert Units APIConvert a numeric value from one unit to another using value, from_unit, and to_unit. Returns the original ...26.8 Correct Text Spelling APIDetect misspellings in short text and return corrected output plus word-level replacements. Useful for edit...26.8 CSV & JSON Data Cleaning and DeduplicationAnalyze CSV text or records for cleanup and duplicate checks. Configure key, required, and numeric columns ...26.8 Describe Cron APIBreak a cron expression into labelled minute, hour, day, month, and weekday fields. Useful for schedule pre...26.8 Detect File type APIInspect a binary file's magic bytes to return filename, extension, MIME type, and description. Useful for v...26.8 Differentiate Text APICompare two text or code snippets and get ordered diff segments plus addition, deletion, and unchanged coun...26.8 DNS Batch Lookup APIBatch resolve domains or IPs for A, AAAA, MX, NS, TXT, CNAME, and PTR records. Get per-row status plus reco...26.8 DNS Lookup APIResolve A, AAAA, MX, TXT, NS, CNAME, SOA, PTR, and CAA records for a domain. Returns records, ttl, and any ...26.8 Domain Availability APICheck whether a domain is available, taken, or indeterminate. Validate candidate names for signup flows, re...26.8 Domain WHOIS Lookup APIGet a domain’s WHOIS record from a domain query. Returns registrar, expiry date, creation date, status, ema...26.8 Email Syntax Validator APIValidate an email address by syntax only and get the local part, domain, and valid flag back. Useful for fa...26.8 Encode and Decode Base64 APIEncode UTF-8 text to Base64 or decode Base64 back to text. Useful for transport, inspection, and round-trip...26.8 Encode and Decode JWT APIEncode JSON payloads into JWTs and verify tokens with a shared secret. Returns a signed token, or validity ...26.8 Extract Readable Content from HTML APIExtract main article text and title from HTML using readability algorithms. Returns cleaned content, short ...26.8 Extract Sitemap from URL APIExtract URLs from a website’s sitemaps, with optional sitemap metadata and async job polling. Useful for SE...26.8 Extract Text from HTML APIExtract clean text from raw HTML, with optional URL support for better results. Returns text and length for...26.8 Extract Text from PDF Document APIExtract text from a PDF file and receive document text, page count, and per-page text. Useful for search, r...26.8 Format Date APIFormat an ISO datetime string with a Python strftime pattern. Returns the input, format, and formatted resu...26.8 Generate Hash APIHash a text string with MD5, SHA1, SHA256, or SHA512. Get the original input, chosen algorithm, and compute...26.8 Generate IDs In Batch APIGenerate batches of UUIDs, ULIDs, NanoIDs, hex strings, or short tokens. Useful for test data, fixtures, an...26.8 Generate Password APIGenerate cryptographically secure passwords with configurable length and optional symbols. Returns the pass...26.8 Generate Random Number APIGenerate a cryptographically secure integer between min and max. The response returns the chosen value and ...26.8 Generate Random String APIGenerate random strings up to 256 characters with alpha, alphanumeric, numeric, or hex output. Useful for t...26.8 Generate SVG Badge APIGenerate SVG badges from a label and message, with optional colors. Download the SVG or get a signed URL fo...26.8 Generate UUID APIGenerate version 1 or 4 UUIDs with a single GET request. Returns the UUID string and version for database k...26.8 JWT Decoder APIDecode a JWT from a token string and inspect its header, payload, and claims without verification. Useful f...26.8 Language Dictionary APIGet ISO 639-1 languages with code, English name, and native name. Useful for language pickers, localisation...26.8 MIME Type Lookup from File Name APIMap filenames or extensions to MIME types, or reverse a MIME type back to a filename-style value. Useful fo...26.8 Parse & Normalize US Address APIParse a free-form address line and optionally a country code into a structured response. Useful for checkou...26.8 Phone Number Formatter APIParse a phone number into E.164, international, and national formats. Returns validity plus country and reg...26.8 Phonetic Text Search APICompare a source word against candidate strings using Metaphone or Soundex. Returns matching words with sha...26.8 Ranked Text Search APIRank fuzzy matches for a search term against space-separated text. Returns matches with Levenshtein distanc...26.8 Resolve Short URL APIResolve shortened URLs to their destination. Control redirect hops and timeout for link checks, moderation,...26.8 Resume Parsing & Analysis APIParse resume files or text into structured output for ATS, screening, and candidate data workflows.26.8 Schedule Cron APICompute the next fire times for a 5-field cron expression. Returns the original expression and an array of ...26.8 Split Excel APISplit .xlsx and .xlsm files into one workbook per value group. Track job status, progress, and download fin...26.8 Text Distance Search APICompare two strings with Levenshtein distance. Send source and target, get an integer edit distance for fuz...26.8 Text Similarity Search APICompare a source string and a target string and get a 0 to 1 similarity score. Useful for fuzzy matching, d...26.8 Validate Or Generate Barcode Check Digits APIValidate or generate barcode check digits for EAN, UPC, and ISBN values. Returns validity and check-digit f...26.8 GitHub REST + GraphQL API (reference provider)Reference provider with arguably the most extensively-tooled developer surface on the web. Public OpenAPI, ...26.6 WhistleWhistle is a cross-platform HTTP, HTTPS, HTTP/2, WebSocket, and TCP debugging proxy tool. It lets developer...26.4

Emerging 36 Early or largely undocumented

CodePen POST to Prefill APIHTTP POST endpoint that accepts JSON-encoded code and configuration and opens a new (unsaved) Pen in the Co...25.8 Bruno API ClientThe core open-source, git-native desktop API client (a lightweight Postman/Insomnia alternative). Compose a...25.7 Bruno CLI (bru)The @usebruno/cli command-line runner (invoked as bru, installed via npm install -g @usebruno/cli) executes...25.7 Bruno Git Integration and SyncPaid Bruno (Pro and Ultimate) adds native in-app Git integration and OpenAPI sync (5 syncs/month on Pro, un...25.7 Voiden Desktop ToolVoiden is a desktop application (Electron/TypeScript) for API design, testing, and documentation using .voi...25.0 CookiecutterA command-line utility that creates projects from project templates. Widely used for API project bootstrapp...23.9 Mustache TemplatesMustache is a logic-less template syntax available for HTML, config files, source code, and more. Used wide...23.9 YeomanYeoman is a scaffolding tool for modern webapps and APIs. Generators provide templates for REST APIs, Expre...23.9 VacuumVacuum is the world's fastest OpenAPI linter written in Go. It processes API specifications at lightning sp...23.6 MediaRuntime APIVersioned REST API (under /v1) for media-processing jobs, reports/analysis, reusable recipes, uploads/water...23.1 sbt Build Toolsbt (Simple Build Tool) is the dominant build tool in the Scala ecosystem (90% adoption). Its Server API en...23.0 Fern Definition and CLICapability area covering Fern's open-source (Apache-2.0) command-line interface and the proprietary Fern De...21.5 Fern SDK GenerationCapability area (CLI/platform, not a hosted REST API) that generates idiomatic, type-safe client SDKs in Ty...21.5 SpecLynxStop wrestling with OpenAPI specs. SpecLynx OpenAPI Toolkit delivers the most effective way to author and m...20.7 SpecLynx ApiDOMA unified semantic parsing engine that underpins all SpecLynx products. ApiDOM parses OpenAPI, AsyncAPI, Ar...20.7 SpecLynx CLIA command-line interface for overlay operations, dereferencing, bundling, format conversion (JSON/YAML), an...20.7 SpecLynx EditorA browser-based OpenAPI editor with real-time validation, smart autocompletion, and live preview. No instal...20.7 SpecLynx Language ServiceAn LSP-compatible npm library (@speclynx/apidom-ls) providing 13 intelligent editing capabilities for API d...20.7 SpecLynx OpenAPI ToolkitA VS Code extension providing semantic editing, real-time validation, linting, and live preview for OpenAPI...20.7 Konfig Demos and TutorialsCapability area (endpointsModeled). Builds interactive, runnable demos and markdown-based tutorials on top ...20.4 Konfig OpenAPI LintingCapability area (endpointsModeled). A configurable linter that inspects an OpenAPI Specification for errors...20.4 Konfig SDK Generation Platform (Sunset)Konfig's developer platform for generating, validating, and publishing SDKs, API reference documentation, a...20.4 FastMCP CLIThe FastMCP CLI is a developer command-line tool for running, inspecting, installing, and debugging MCP ser...19.7 AVAP BRUNIXAVAP BRUNIX is an AI copilot integrated into the AVAP framework, providing intelligent assistance for API d...18.4 Arc Developer ModeIn-browser Developer Mode for engineers - exposes developer tools, extension management, and Portrait Mode ...18.0 DapperDoxDapperDox is an open-source API documentation generator that renders beautiful, customizable reference docs...17.3 Babylon.js InspectorEmbeddable developer tool that overlays a live tree of every Babylon scene object — nodes, materials, textu...16.8 Spector.jsBrowser extension and embeddable library that captures and inspects WebGL / WebGPU frames — every draw call...16.8 API Stack DirectoryThe API Stack Directory is a searchable catalog of 213+ API tools and services organized into 50+ categorie...14.4 SpearSpear is a developer platform focused on API development workflows, providing tools for API design, collabo...13.8 LinkPeek Screenshot APIGET-based HTTP image API that returns a screenshot for any given web page URI. Embeddable directly in HTML ...12.7 LinkPeek Website Screenshot APIREST-style HTTP GET endpoint that accepts a target web page URI and returns a screenshot image. Supports si...12.7 Website Screenshot APIREST-style HTTP GET image API. A call to /api/v1 with query parameters (uri, size, viewport) returns a scre...12.7 KeyRunner PlatformThe KeyRunner platform provides a local-first toolset for testing, monitoring, mocking, and running APIs wi...12.5 JoggrJoggr is a documentation platform purpose-built for software teams, helping engineering teams create and ma...11.5 Mask APIMask API is a powerful and flexible tool designed to help programmers and companies customize the response ...11.4

Minimal 2 Almost no public developer surface

QName AI WHOIS REST APIApproval-gated REST API for WHOIS/RDAP lookups: GET /api/whois/{domain} (single), POST /api/whois/batch (ba...10.0 Developer ToolsLow-code configuration and extension surface for the Odessa Platform — documented APIs for connecting any a...9.5

Unrated 1 Not yet scored

Fusebit HTTP APIThe Fusebit HTTP API managed and executed everything on the platform across two concurrent major versions o...

Companies reaching this through an API (41)

These companies publish an API, specification or operation carrying “Developer Tools” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Score breakdown

Frequency

85.0

log-scaled weighted occurrences

Breadth

29.4

spread across providers

Quality lift

39.1

mean composite of providers using it

Cohesion

14.5

strength of nearest seed neighbor

Where this tag comes from

Provider tag1067

Api tag215

Cohort brief

Auto-generated

The 1020 providers in the APIs.io catalog tagged Developer Tools, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

1020

all scored

Mean Kin Score

35.1

+11.2 vs catalog 23.9

Mean Agent Readiness

18.5

+6.5 vs catalog 12

Spread

2.6–82.3

median 35 · σ 15.3

How the 1020 split by band

Exemplar 22Strong 80Developing 302Thin 313Emerging 240Minimal 63

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	45.7	23.4	+22.3	1020
Operational Transparency	26	14	+12	1020
Contract Quality	29.5	19.8	+9.7	1020
Access Clarity	35	26.5	+8.5	1020
Discoverability	67.5	61.2	+6.3	1020
Contract Governance	10.1	6.4	+3.7	1020

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	27%	10%	+17
MCP server (first-party)	29%	13%	+16
Agent Skills	0%	0%	0
OAuth scopes	12%	11%	+1
Security	97%	97%	0
Arazzo workflows	4%	2%	+2
Governance rules	21%	14%	+7

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 AhaSend 82.3
2 LaunchDarkly 77.9
3 Drippay 76.1
4 Plunk 74.6
5 Redocly 74.6
6 Postman 72.5
7 Mailboxlayer 71.9
8 Blnk Finance 71.8
9 Gitea 71.7
10 Akuity 71.5

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This tag

curl "https://apis.io/api/v1/tags/developer-tools"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/developer-tools"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/developer-tools/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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