Lingo.dev

Lingo.dev (formerly Replexica) is an AI localization platform for software teams. Its hosted Localization Engine exposes a Bearer/X-API-Key REST API and SDK for translating text, objects, chat messages, HTML, and string arrays while preserving structure, brand voice, and glossaries. Open-source tooling - the CLI and the build-time React Compiler - sits on top of the same engine.

Lingo.dev publishes 5 API contracts indexed on the APIs.io network, including Account API, Asynchronous API, Synchronous API, and 2 more. Tagged areas include Artificial Intelligence, Localization, Translation, i18n, and Developer Tools.

The Lingo.dev catalog on APIs.io includes 1 Spectral governance ruleset.

Lingo.dev’s developer surface includes pricing, authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.9/100 thin ▬ flat Agent 20/100 agent aware Front door AI 5/6 prominent Heartbeat 48/100 slowing open core · Apache-2.0 Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Artificial Intelligence Localization Translation i18n Developer Tools Internationalization

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 37.9/100 · thin

Contract Quality 9.5 / 19

Developer Ergonomics 5.9 / 15

Access Clarity 5.1 / 15

Operational Transparency 2.1 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 34.0 — up to +13.2 composite points Ask about this →
Contract Quality scores 50.8 — up to +12.3 composite points Ask about this →
Developer Ergonomics scores 39.3 — up to +12.1 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/lingo-dev/apis.yml: open an issue on github.com/api-evangelist/lingo-dev to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Localization and Translation Management	undeclared	-	1	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Lingo.dev CLI

Open-source command-line tool that localizes JSON, YAML, Markdown, CSV, and PO files in one command, tracking a lockfile so only new or changed content is processed. Connects to...

Lingo.dev Compiler

Open-source build-time React localization. The Compiler detects translatable strings and generates localized variants at build time without i18n wrappers, translation keys, or t...

Lingo.dev Account API

The Account API from Lingo.dev — 1 operation(s) for account.

Lingo.dev Asynchronous API

The Asynchronous API from Lingo.dev — 2 operation(s) for asynchronous.

Lingo.dev Synchronous API

The Synchronous API from Lingo.dev — 3 operation(s) for synchronous.

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Lingo.dev Engine Account API

OPEN COLLECTION

Lingo.dev Engine Account Asynchronous API

OPEN COLLECTION

Lingo.dev Engine Account Synchronous API

OPEN COLLECTION

Lingo.dev Engine API

OPEN COLLECTION

Lingo.dev API pricing

Prices published by Lingo.dev, read 2026-10-07 from lingo.dev/en/pricing.

Plan	Price
Sandbox	$0 Includes: 100K tok/day throughput, 7 days data retention, unlimited engines/seats
Production	$99/mo Includes: 5M tok/day throughput, 30 days data retention
Enterprise	Custom Includes: Unlimited throughput, 99.99% uptime SLA, human review, SSO

Plan details, limits and sources →

Rate limits

Monthly Translated Words: per plan allotment words
Requests Per Minute (RPM): see provider documentation requests
Concurrent Jobs: see provider documentation jobs

Compiled by API Evangelist, not yet checked against Lingo.dev's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Lingo.dev Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Lingo.dev Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Lingo.dev Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Lingo.dev API Rules

58 rules · 56 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Lingo.dev Authentication

apiKey · 1 scheme

SECURITY

Lingo.dev Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Lingo.dev Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Lingo.dev Agentic Access

7 operations · 3 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: lingo-dev
url: https://raw.githubusercontent.com/api-evangelist/lingo-dev/refs/heads/main/apis.yml
name: Lingo.dev
kind: company
description: Lingo.dev (formerly Replexica) is an AI localization platform for software teams. Its hosted Localization Engine
  exposes a Bearer/X-API-Key REST API and SDK for translating text, objects, chat messages, HTML, and string arrays while
  preserving structure, brand voice, and glossaries. Open-source tooling - the CLI and the build-time React Compiler - sits
  on top of the same engine.
deliveryModel:
  model: open-core
  license: Apache-2.0
  license_evidence:
    repo: lingodotdev/lingo.dev
    spdx: Apache-2.0
    stars: 5404
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: medium
  source:
  - openapi
  - pricing
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/lingo-dev.png
tags:
- Artificial Intelligence
- Localization
- Translation
- i18n
- Developer Tools
- Internationalization
tags_raw:
- AI
- Localization
- Translation
- i18n
- Developer Tools
- Internationalization
created: '2026-06-21'
modified: '2026-09-16'
specificationVersion: '0.23'
apis:
- aid: lingo-dev:cli
  name: Lingo.dev CLI
  tags:
  - CLI
  - Open Source
  - i18n
  - CI/CD
  tags_raw:
  - CLI
  - Open Source
  - i18n
  - CI/CD
  - Open-Source
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://lingo.dev/en/cli
  baseURL: https://api.lingo.dev
  properties:
  - url: https://lingo.dev/en/cli/quick-start
    type: Documentation
  - url: https://github.com/lingodotdev/lingo.dev
    type: SourceCode
  description: Open-source command-line tool that localizes JSON, YAML, Markdown, CSV, and PO files in one command, tracking
    a lockfile so only new or changed content is processed. Connects to the Lingo.dev engine by default and can bring your
    own LLM (OpenAI, Anthropic, Google, Mistral, OpenRouter, Ollama).
- aid: lingo-dev:compiler
  name: Lingo.dev Compiler
  tags:
  - Compilers
  - React
  - Open Source
  - Build-time
  tags_raw:
  - Compiler
  - React
  - Open Source
  - Build Time
  - Open-Source
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://lingo.dev/en/compiler
  baseURL: https://api.lingo.dev
  properties:
  - url: https://lingo.dev/en/compiler
    type: Documentation
  - url: https://github.com/lingodotdev/lingo.dev
    type: SourceCode
  description: Open-source build-time React localization. The Compiler detects translatable strings and generates localized
    variants at build time without i18n wrappers, translation keys, or t() function calls, using the same localization engine
    behind the scenes.
- aid: lingo-dev:lingo-dev-account-api
  name: Lingo.dev Account API
  description: The Account API from Lingo.dev — 1 operation(s) for account.
  humanURL: https://lingo.dev/en/docs/api
  baseURL: https://api.lingo.dev
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/lingo-dev-account-api-openapi.yml
  - type: Documentation
    url: https://lingo.dev/en/docs/api
  - type: APIReference
    url: https://lingo.dev/en/docs/api/localization
  - type: PostmanCollection
    url: collections/lingo-dev.postman_collection.json
  - type: OpenCollection
    url: collections/lingo-dev.opencollection.json
  - type: Documentation
    url: https://lingo.dev/en/sdk/javascript
  - type: SDKs
    url: https://www.npmjs.com/package/lingo.dev
- aid: lingo-dev:lingo-dev-asynchronous-api
  name: Lingo.dev Asynchronous API
  description: The Asynchronous API from Lingo.dev — 2 operation(s) for asynchronous.
  humanURL: https://lingo.dev/en/docs/api
  baseURL: https://api.lingo.dev
  tags:
  - Asynchronous
  properties:
  - type: OpenAPI
    url: openapi/lingo-dev-asynchronous-api-openapi.yml
  - type: Documentation
    url: https://lingo.dev/en/docs/api
  - type: APIReference
    url: https://lingo.dev/en/docs/api/localization
  - type: PostmanCollection
    url: collections/lingo-dev.postman_collection.json
  - type: OpenCollection
    url: collections/lingo-dev.opencollection.json
  - type: Documentation
    url: https://lingo.dev/en/sdk/javascript
  - type: SDKs
    url: https://www.npmjs.com/package/lingo.dev
- aid: lingo-dev:lingo-dev-synchronous-api
  name: Lingo.dev Synchronous API
  description: The Synchronous API from Lingo.dev — 3 operation(s) for synchronous.
  humanURL: https://lingo.dev/en/docs/api
  baseURL: https://api.lingo.dev
  tags:
  - Synchronous
  properties:
  - type: OpenAPI
    url: openapi/lingo-dev-synchronous-api-openapi.yml
  - type: Documentation
    url: https://lingo.dev/en/docs/api
  - type: APIReference
    url: https://lingo.dev/en/docs/api/localization
  - type: PostmanCollection
    url: collections/lingo-dev.postman_collection.json
  - type: OpenCollection
    url: collections/lingo-dev.opencollection.json
  - type: Documentation
    url: https://lingo.dev/en/sdk/javascript
  - type: SDKs
    url: https://www.npmjs.com/package/lingo.dev
common:
- type: Pricing
  url: https://lingo.dev/en/pricing
- type: AgenticAccess
  url: agentic-access/lingo-dev-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/lingo-dev-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/lingo-dev-domain-security.yml
- type: Authentication
  url: authentication/lingo-dev-authentication.yml
- type: GitHubOrganization
  url: https://github.com/lingodotdev
- type: LinkedIn
  url: https://www.linkedin.com/company/lingodotdev
- type: Website
  url: https://lingo.dev
- type: Documentation
  url: https://lingo.dev/en/docs
- type: Plans
  url: plans/lingo-dev-plans-pricing.yml
- type: RateLimits
  url: rate-limits/lingo-dev-rate-limits.yml
- type: FinOps
  url: finops/lingo-dev-finops.yml
- type: Blog
  url: https://lingo.dev/en/blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Lingo.dev API — frequently asked questions

Does Lingo.dev have an API?

Yes. APIs.io lists 5 APIs from Lingo.dev, including Lingo.dev CLI, Lingo.dev Compiler and Lingo.dev Account API, and 2 more.

Is there an OpenAPI specification for the Lingo.dev API?

Yes. APIs.io indexes 3 OpenAPI specifications for Lingo.dev, each linked for download from this page.

How do I authenticate with the Lingo.dev API?

Lingo.dev uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Lingo.dev Authentication.

How much does the Lingo.dev API cost?

Lingo.dev publishes its prices; its Sandbox plan is $0 as of 2026-10-07. APIs.io lists 3 pricing plans for Lingo.dev, with each plan's price, limits and inclusions under Pricing on this page.

Is the Lingo.dev API ready for AI agents?

Lingo.dev has a Kin Score of 37.9 out of 100 (thin) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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