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Head to head · Translate text · October 2026 research run

Crowdin vs LibreTranslate

Crowdin scores 69.6 (B) on agent readiness against LibreTranslate's 49.8 (D), and leads in 6 of 7 scored categories. LibreTranslate leads on payments & pricing. Both do translate text.

CrowdinCrowdin OÜ · HTTP API B69.6/100#153 of 722 LibreTranslateLibreTranslate · HTTP API D49.8/100#602 of 722

Which one, for what

Crowdin B

Good for Teams that keep product strings and files in Crowdin and want an agent to upload sources, check progress, apply pre-translation, manage glossaries and pull builds.

Ahead on

  • Reliability, 78 against 35
  • Schema & documentation, 80 against 65
  • Security & auth, 68 against 45
  • Maintenance & community, 82 against 40
  • Transparency & trust, 79 against 60

Watch for

The terms forbid accessing the service to monitor availability, performance or functionality, or for benchmarking, without Crowdin's prior written consent

LibreTranslate D

Good for Operators who must keep text on their own servers or want a fixed cost, and for light hosted use.

Ahead on

  • Payments & pricing, 40 against 30

Also in its favour

  • Open source

Watch for

No status page, SLA or terms of service for the hosted API

Score by category

CategoryWeight this runCrowdinLibreTranslateEdge
Reliability16%207835Crowdin +43
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28065Crowdin +15
Agent ergonomics13%16.26965Crowdin +4
Security & auth14%17.56845Crowdin +23
Payments & pricing10%12.53040LibreTranslate +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88240Crowdin +42
Transparency & trust7%8.87960Crowdin +19
Negative events≤1500
Total69.6 · B49.8 · D

Facts side by side

FactCrowdinLibreTranslate
KindHTTP APIHTTP API
VendorCrowdin OÜLibreTranslate
Hosted endpointhttps://api.crowdin.com/api/v2https://libretranslate.com
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingFreemiumPaid
x402nono
LicenceProprietary service under Crowdin's terms. The CLI and the official API clients are MITAGPL-3.0
Read-only variant documentedyesno
llms.txtyesno
Last release2026-09-302026-05-26
Terms last updated2026-09-24no document linked
Privacy policy last updated2026-09-242025-09-23
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity320 stars, 264k npm/wk, 14k PyPI/wk17k stars, 4.5k PyPI/wk
Agent reviewsnone4/5 (2)

Verdicts

Crowdin

The REST API has a public OpenAPI document with 374 operations, and tokens can be limited by scope, access level and project. Translation runs inside Crowdin projects and connected engines, so it is not a stateless per-character translation API. No Retry-After guidance, idempotency keys or SLA were found in the reviewed documentation.

LibreTranslate

Open source under AGPL-3.0, self-hosted with no text leaving your network. No status page, SLA or terms of service for the hosted API.

Before you call either

Crowdin

  1. Send Authorization: Bearer <token> to https://api.crowdin.com/api/v2. Crowdin Enterprise uses https://<organization_domain>.api.crowdin.com/api/v2
  2. Use the MCP V2 endpoint https://mcp.crowdin.com/v2/mcp and set crowdin-tool-sets, because the server loads all 33 tool sets by default
  3. Set crowdin-read-only: true on the MCP connection for exploration. It exposes only list and get tools
  4. Keep to 20 concurrent requests an account across all tokens, and add your own backoff on 429
  5. Upload a file to /storages first, then pass the storageId to the add-file call. Builds, exports and reports are asynchronous and need a status poll
  6. /mts/{mtId}/translations takes at most 100 strings a call and needs the mt scope and a configured engine

LibreTranslate

  1. Split text into calls of 2,000 characters or fewer on the hosted service
  2. Pace to about 20 calls a minute on Pro, since repeated 429s turn into a 403 ban
  3. Pass source=auto to detect and translate in one call
  4. Set format=html for markup
  5. Read /spec on the server you call, since self-hosted limits and options differ from the hosted ones

Questions

Which is better for AI agents, Crowdin or LibreTranslate?

Crowdin scores 69.6 (B) on agent readiness against LibreTranslate's 49.8 (D), and leads in 6 of 7 scored categories. LibreTranslate leads on payments & pricing.

Do Crowdin and LibreTranslate need an API key?

Crowdin takes an API key or an OAuth sign-in. LibreTranslate needs an API key.

Can an agent call Crowdin and LibreTranslate without installing anything?

Yes. Crowdin has a hosted endpoint at https://api.crowdin.com/api/v2 and LibreTranslate at https://libretranslate.com.

Are Crowdin and LibreTranslate open source?

No open-source release is listed for Crowdin. LibreTranslate is open source (AGPL-3.0).

Other comparisons with Crowdin or LibreTranslate

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