Feature

Open Source

Source code published under an open license.

113 providers 670 APIs 108 declared variants

The implementation is openly licensed and publicly readable, so integrators can audit behavior, fork, and contribute. Also changes the risk calculus on vendor continuity.

113 API providers on the APIs.io network offer open source. The highest-rated are Canvas LMS, Airbyte, Pipedream, Commerce Layer, Daytona.

Providers

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

Exemplar 4 Complete, well-documented, and agent-ready
Canvas LMS Canvas is the open, AGPLv3-licensed learning management system created and maintained by Instructure, Inc. ... 7 APIs 73.4 Airbyte Airbyte is an open-source data integration platform that enables businesses to easily and efficiently move ... 1 API 71.2 Pipedream Pipedream is a developer-centric integration platform providing three product lines: Workflows (code-level ... 3 APIs 70.9 Commerce Layer Commerce Layer is the headless, multi-market commerce API used by global brands to sell everywhere — web, m... 3 APIs 70.3
Strong 21 Solid coverage with minor gaps
Daytona Daytona is open-source, secure, and elastic infrastructure for running AI-generated code. Daytona sandboxes... 11 APIs 69.7 Highlight (highlight.io) Highlight (highlight.io) is the open-source, full-stack monitoring platform — session replay, error monitor... 7 APIs 68.0 Buildkite Buildkite is a hybrid CI/CD platform that combines a hosted control plane (pipelines.buildkite.com) with se... 5 APIs 67.8 Stytch Stytch is an authentication and identity infrastructure provider. Its Consumer and B2B APIs cover passwordl... 3 APIs 67.6 Pocket Network Pocket Network is the decentralized RPC layer of Web3 — a permissionless, fully open data delivery protocol... 3 APIs 67.3 sensible-so Sensible is a document-automation API platform that extracts structured data from PDFs, images, spreadsheet... 4 APIs 66.4 APIs.io APIs.io is an open source API search engine and directory that uses APIs.json files to discover, index, and... 1 API 65.4 Hyperbolic Hyperbolic is an open-access AI cloud and decentralized GPU marketplace serving 200,000+ builders with affo... 6 APIs 65.2 GitLab GitLab Inc. is an open-core company that develops GitLab, a DevOps software platform for building, securing... 41 APIs 64.6 Inworld AI Inworld AI is a real-time voice AI infrastructure provider. The Inworld platform delivers text-to-speech, s... 6 APIs 64.5 Nanonets Nanonets is a no-code document AI and OCR platform that combines a custom-model OCR API, pre-built document... 4 APIs 64.3 ibm-quantum IBM Quantum is IBM's quantum computing program — the operator of the IBM Quantum Platform (quantum.cloud.ib... 8 APIs 64.2 Microsoft Azure Quantum Microsoft Azure Quantum is Microsoft's cloud quantum computing service — an open, multi-vendor platform tha... 5 APIs 64.2 fireblocks Fireblocks is an institutional digital-asset and stablecoin infrastructure company providing MPC-secured cu... 15 APIs 63.9 Paperspace Paperspace is a GPU cloud platform for AI, ML, and 3D rendering workloads, acquired by DigitalOcean in 2023... 10 APIs 63.1 Outbrain Outbrain Inc. (NASDAQ: OB), which closed its acquisition of Teads in early 2025 and now operates public... 3 APIs 61.9 Civitai Civitai is the largest open community for Stable Diffusion, SDXL, Flux, and video AI models — hosting over ... 3 APIs 61.8 Mews Mews is a cloud-native hospitality operating system serving 15,000+ hotels, hostels, and vacation-rental pr... 6 APIs 61.6 Vespa Vespa is an open-source AI search engine, big-data serving engine, and vector database originally developed... 8 APIs 60.8 Recraft Recraft is a London-based AI design platform — founded in 2023 by Anna Veronika Dorogush (creator of the Ca... 2 APIs 60.4 TIDAL TIDAL is a high-fidelity music streaming service owned by Block (Square's parent, acquired 2021) offering H... 10 APIs 60.2
Developing 33 Usable, with meaningful gaps to close
ankr Ankr is a Web3 infrastructure provider whose multichain RPC, Advanced API, liquid staking, contract automat... 5 APIs 59.5 D-Wave D-Wave Quantum Inc. (NYSE: QBTS) is the leader in commercial quantum annealing computing and developer of t... 6 APIs 59.4 Chroma Chroma (Chroma DB) is an open-source AI-native embedding database designed to make it easy to build LLM app... 4 APIs 59.3 Google Quantum AI Google Quantum AI is Google's quantum-computing research and engineering arm, building superconducting quan... 10 APIs 59.3 Encore Encore is a backend application framework and developer cloud that lets engineering teams build type-safe d... 5 APIs 59.2 Backpack Backpack is a Solana-first crypto company founded by Armani Ferrante and Tristan Yver — the same team behin... 3 APIs 59.0 Triton One Triton One is a high-performance Solana RPC and blockchain infrastructure provider operating globally distr... 9 APIs 58.3 ThingsBoard ThingsBoard is an open-source IoT platform for device connectivity, data collection, processing, and visual... 15 APIs 58.2 ServiceTitan ServiceTitan is the operating system for the trades — all-in-one field service management software for resi... 23 APIs 57.6 Typesense Typesense is a fast, typo-tolerant, open-source search engine designed for developer productivity. It provi... 5 APIs 57.3 E2B E2B (e2b-dev) provides secure, isolated cloud sandboxes for AI agents and AI-generated code, built on a for... 7 APIs 57.0 Leonardo.AI Leonardo.AI is an Australian generative-AI company (acquired by Canva in July 2024) offering a Production A... 14 APIs 56.7 1NCE 1NCE is a Cologne-headquartered global IoT connectivity provider best known for the IoT Lifetime Flat — a s... 6 APIs 55.7 Continue Continue is the open-source AI code assistant for VS Code and JetBrains, distributed under Apache 2.0. The ... 5 APIs 55.5 N8n Build with the precision of code or the speed of drag-n-drop. Host with on-prem control or in-the-cloud con... 2 APIs 54.6 Conekta Conekta is a Mexico-based payment processor that lets businesses accept credit and debit cards, OXXO cash v... 1 API 54.4 Octopus Energy Octopus Energy is a UK-founded retail energy supplier and the parent of Kraken Technologies, the AI-powered... 3 APIs 54.1 Lichess Lichess is a free, ad-free, open-source online chess server operated by a French nonprofit and powered enti... 1 API 53.8 Formant Formant is a San Francisco–based robotics and physical-operations cloud platform that lets companies operat... 4 APIs 53.2 Tensor Tensor is the Solana-native NFT marketplace and trading protocol founded by Tensor HQ and now stewarded by ... 3 APIs 52.2 Umami Umami is an open source, privacy-first web analytics platform that provides website traffic insights withou... 1 API 52.1 Packagist Packagist is the default package repository for Composer, the PHP dependency manager. It indexes over 454,0... 1 API 51.6 Beatoven.ai Beatoven.ai is an Indian generative-music startup (Bengaluru, founded 2021) building text-to-music and text... 1 API 51.5 arXiv arXiv is the open-access e-print repository operated by Cornell Tech, hosting more than two million preprin... 4 APIs 50.8 Forethought Forethought is a San Francisco-based generative AI customer-support platform. Its multi-agent product suite... 2 APIs 50.7 Redis Redis is an open source, in-memory data structure store used as a database, cache, message broker, and stre... 4 APIs 49.5 Nango Nango.dev is a developer infrastructure platform that simplifies building product integrations with externa... 1 API 48.6 AgStack Foundation AgStack Foundation is a Linux Foundation project providing open-source digital infrastructure for the agric... 3 APIs 48.5 Cerbos Cerbos is an open-core, language-agnostic, scalable authorization platform that decouples access control fr... 6 APIs 47.8 Academy Software Foundation The Academy Software Foundation (ASWF) is a Linux Foundation project that supports open source software dev... 11 APIs 47.0 ipify ipify operates two complementary IP APIs. The free Public IP Address API (api.ipify.org, api6.ipify.org, ap... 2 APIs 46.8 PokéAPI PokéAPI (pokeapi.co) is a free, open-source RESTful and GraphQL API serving comprehensive Pokémon data — in... 2 APIs 45.8 crates.io crates.io is the official package registry for the Rust programming language, operated by the crates.io tea... 2 APIs 45.4
Thin 25 Limited public surface area
Docling Docling is an open-source toolkit for parsing diverse document formats — PDF, DOCX, PPTX, XLSX, HTML, image... 16 APIs 44.2 Unity Unity is a real-time 3D content creation platform — the Unity engine powers cross-platform games, simulatio... 19 APIs 43.7 Children's Hospital of Philadelphia Founded in 1855 as the first hospital in the United States dedicated to the healthcare of children, Childre... 5 APIs 43.5 ACI.dev ACI.dev (Aipolabs Agent-Computer Interface) is an open-source tool-calling platform that hooks AI agents in... 4 APIs 43.1 Random User Generator Free random user data API for generating realistic fake user profiles with names, addresses, photos, and co... 1 API 42.9 Cypress Semiconductor Cypress Semiconductor was a US-based semiconductor company known for its PSoC programmable system-on-chip m... 7 APIs 42.5 Casdoor Casdoor is an open-source, AI-first identity and access management (IAM) and MCP gateway authentication ser... 8 APIs 42.2 Descope Descope is a customer and agentic identity access management (CIAM) platform founded in 2022 by veterans of... 5 APIs 41.6 Frankfurter Frankfurter is an open-source (MIT) currency exchange rates API that blends foreign-exchange reference rate... 2 APIs 41.0 American Airlines American Airlines is one of the world's largest airlines, operating an extensive domestic and international... 1 API 40.8 Jaeger Jaeger is an open-source, end-to-end distributed tracing platform for monitoring and troubleshooting transa... 3 APIs 38.4 Analog Devices Analog Devices (ADI) is a global semiconductor company designing high-performance analog, mixed-signal, and... 3 APIs 38.2 VA Lighthouse VA Lighthouse is the US Department of Veterans Affairs' developer API platform. Published at developer.va.g... 23 APIs 37.4 Medusa Medusa is an open-source headless commerce platform written in Node.js and TypeScript, distributed under th... 9 APIs 36.1 Three.js Three.js is an open-source JavaScript 3D library originally created by Ricardo Cabello (mrdoob) in 2010 and... 6 APIs 35.8 Yarn Yarn is an open-source JavaScript package manager and project manager originally created at Facebook in 201... 10 APIs 35.3 Apiary Apiary is an API design and documentation platform, now part of Oracle Cloud Infrastructure. With 486,000+ ... 2 APIs 32.7 Krea Krea is a real-time AI creative suite that lets designers, filmmakers, brand teams, and everyday creators g... 8 APIs 32.2 Volvo Cars Volvo Cars is a Swedish premium automotive OEM (headquartered in Gothenburg, owned by Geely) that operates ... 4 APIs 32.2 Audiomack Audiomack is an on-demand music streaming and audio discovery platform that lets artists and creators uploa... 1 API 32.0 Quote Garden Quote Garden is a free, open-source REST API that serves more than 75,000 famous quotes. Built by Prathames... 1 API 32.0 Jitsi Jitsi is a collection of free and open-source projects for secure, simple, and scalable real-time video con... 10 APIs 31.3 Syndica Syndica is a Solana-only infrastructure company building developer infrastructure for Web3. Its production ... 4 APIs 31.3 OpenHands OpenHands (by All Hands AI, formerly OpenDevin) is an open-source autonomous coding agent platform. Ships a... 4 APIs 30.4 Deutsche Telekom Deutsche Telekom AG is Europe's largest telecommunications operator, headquartered in Bonn, Germany, servin... 20 APIs 30.1
Emerging 27 Early or largely undocumented
Turborepo Turborepo is a high-performance build system for JavaScript and TypeScript codebases, built by Vercel and w... 1 API 29.9 Pasqal Pasqal is a French neutral-atom quantum computing company headquartered in Palaiseau, France and co-founded... 8 APIs 29.7 Cielo Cielo is one of the largest Brazilian card acquirers and a publicly traded company (B3:CIEL3), originally f... 13 APIs 29.6 Glama Glama is an all-in-one AI workspace combining an MCP server marketplace and registry, a managed MCP gateway... 7 APIs 29.5 Xanadu Xanadu is a Toronto-based photonic quantum computing company building cloud-accessible continuous- variable... 10 APIs 29.5 Renovate Renovate is an open source automated dependency update bot maintained by Mend. It scans repositories for re... 6 APIs 28.4 Apache Software Foundation The Apache Software Foundation (ASF) is a 501(c)(3) nonprofit organization that provides open source softwa... 1 API 28.0 Eyevinn Technology Eyevinn Technology is a Stockholm, Sweden based video streaming consultancy and open source company special... 8 APIs 27.5 BMW ConnectedDrive BMW ConnectedDrive is BMW Group's umbrella for connected vehicle services spanning navigation, remote servi... 3 APIs 27.2 Raken Raken is a San Diego-based construction technology company providing a field-first daily reporting and fiel... 1 API 27.1 Firely Firely is an Amsterdam-based health IT company and one of the original co-developers of the HL7 FHIR (Fast ... 2 APIs 27.0 Automatisch Automatisch is an open source business automation tool and self-hosted alternative to Zapier that connects ... 1 API 26.7 CHAOSS CHAOSS (Community Health Analytics in Open Source Software) is a Linux Foundation project that develops met... 4 APIs 26.7 Sony Sony Group Corporation is a Japanese multinational spanning electronics, gaming, entertainment, image senso... 4 APIs 26.5 Signifyd Signifyd is an ecommerce fraud prevention, chargeback protection, and revenue optimization platform. Its Co... 8 APIs 26.2 Xanadu Xanadu is a Canadian photonic quantum computing company building room-temperature, fault-tolerant, scalable... 14 APIs 24.0 Changelog Changelog is a media company and podcast network for developers covering open source and software developme... 4 APIs 23.5 Scenario Scenario is a Paris- and San Francisco-headquartered AI platform for game asset generation founded in 2021 ... 5 APIs 23.1 pnpm pnpm is a fast, disk space efficient package manager for JavaScript and Node.js projects. It uses a content... 5 APIs 21.9 Satellogic Satellogic is an Argentine-founded, U.S.-listed (NASDAQ: SATL) vertically integrated Earth observation comp... 6 APIs 21.9 CHIPS Alliance CHIPS Alliance is a Linux Foundation project (founded in 2019) that develops open-source hardware (silicon)... 1 API 21.1 QuEra Computing QuEra Computing is a Boston-based neutral-atom quantum computing company (founded 2018) that operates Aquil... 8 APIs 20.7 Apivault Apivault is an open-source directory and gateway for discovering public APIs. The platform catalogs thousan... 1 API 20.0 Refact.ai Refact.ai is an open-source, local-first AI coding assistant and autonomous software-engineering agent buil... 2 APIs 19.5 Quantinuum Quantinuum is an integrated quantum computing company formed by the 2021 merger of Honeywell Quantum Soluti... 9 APIs 19.4 WhyLabs WhyLabs was an AI observability platform focused on data and model monitoring for both classical ML and LLM... 3 APIs 17.9 Bosch Bosch is a German multinational engineering and technology company producing automotive components, industr... 5 APIs 15.0
Minimal 3 Almost no public developer surface
SST SST is an open source TypeScript framework for building full-stack applications on your own infrastructure.... 2 APIs 10.9 OctoAI OctoAI (formerly OctoML) was a Seattle-based AI inference platform founded in 2019 as a University of Washi... 5 APIs 10.7 Rolls-Royce Rolls-Royce plc is a British multinational aerospace and defense company manufacturing aero engines (Trent ... 1 API 9.5

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

100% open source under Apache 2.0 (with separate commercial license for `highlight.io/` and `enterprise/` directories)150+ pre-built configurations in the open-source sensible-configuration-library covering common document types (1040, W-2, 1099, ACORD forms, loss runs, bank statements, rate confirmations)25+ open-source inference models — Llama 3.1 8B/70B/405B, Qwen 2.5, DeepSeek V3, DeepSeek R1, Hermes 3, Mistral, Llama 3.2 Vision, Qwen2-VL300+ Open Source Projects3D Scene module with custom-layer extensibility (open-source 3d-viewer-module)AGPL-3.0 Open SourceAll Google Quantum AI open-source software is Apache 2.0 licensedApache 2.0 LicenseApache 2.0 Open Source LicenseApache 2.0 licensed; governance via GOVERNANCE.md and MAINTAINERS.mdApache 2.0 open-source licensing for pytket, qnexus, lambeq, Guppy, Selene, QermitAutoChain — open-source lightweight framework for building and testing LLM agents (1.8k+ GitHub stars)Browser-side background-removal JS library and Blender texturing plugin available as open sourceC# scripting with hot-reload, the Unity Scripting API, and full source available via UnityCsReferenceCompanion BMW Car IT open-source stack (joynr, ramses, MoCOCrW, python-dlt) underpinning connected-vehicle middlewareCore: free open-source self-managedFirely .NET SDK — official open-source C# FHIR library (de-facto reference SDK)Free open-source MCP server hostingFree, ad-free, open-source online chess server operated by a French nonprofit, funded by donationsHosted Flow app (React) with full source available for self-hostingHosted micro frontends: checkout, cart, my-account, microstore, identity — each open-source on GitHubKrea Realtime experience with sub-50ms image generation and an open-source Realtime 14B autoregressive video model distilled from Wan 2.1 (CC BY-NC-SA 4.0)Local MCP server (Node.js, billed against API units) — open source on GitHubMIT LicenseMIT licensed, no required runtime dependencies, runs in browser, Node.js, Electron, Tauri, Deno, and React NativeMIT licensed, open source on GitHub (vercel/turborepo)MIT-licensed open sourceMIT-licensed open source codebase (composer/packagist) — operated, not designed for reuseOcean SDK — Python open-source SDK covering dimod, dwave-system, dwave-cloud-client, hybrid, samplersOfficial OpenAPI 3.1 specification published under MIT license at github.com/conekta/openapiOn-chain programs are open-source (Apache-2.0) Anchor programs published as IDLs, npm packages, and Rust cratesOpen SourceOpen Source (BSD-3-Clause)Open Source (MIT)Open Source Cloud (OSC)Open Source EcosystemOpen Source FocusOpen Source GovernanceOpen Source InfrastructureOpen Source IoT

Showing 40 of 108 declared variants