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Head to head · Translate text · October 2026 research run

LibreTranslate vs Phrase

Phrase scores 64.2 (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.

LibreTranslateLibreTranslate · HTTP API D49.8/100#602 of 722 PhrasePhrase a.s. · HTTP API B64.2/100#285 of 722

Which one, for what

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

Phrase B

Good for Teams that keep translation projects, term bases and translation memories in Phrase and want an agent to run them, or to translate through engines chosen per language pair.

Ahead on

  • Reliability, 55 against 35
  • Schema & documentation, 87 against 65
  • Agent ergonomics, 70 against 65
  • Security & auth, 58 against 45
  • Maintenance & community, 83 against 40
  • Transparency & trust, 74 against 60

Also in its favour

  • Free to start without a card

Watch for

status.phrase.com lists 14 incidents between 10 July and 8 October 2026, two marked critical and ten major, most confined to one component

Score by category

CategoryWeight this runLibreTranslatePhraseEdge
Reliability16%203555Phrase +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26587Phrase +22
Agent ergonomics13%16.26570Phrase +5
Security & auth14%17.54558Phrase +13
Payments & pricing10%12.54030LibreTranslate +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84083Phrase +43
Transparency & trust7%8.86074Phrase +14
Negative events≤1500
Total49.8 · D64.2 · B

Facts side by side

FactLibreTranslatePhrase
KindHTTP APIHTTP API
VendorLibreTranslatePhrase a.s.
Hosted endpointhttps://libretranslate.comhttps://mcp.eu.phrase.com
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingPaidPaid
x402nono
LicenceAGPL-3.0Proprietary service under the Phrase Terms of Service. The CLI, the Strings API clients and the deprecated local MCP server on GitHub are MIT
Read-only variant documentednono
llms.txtnoyes
MCP registrynot listedio.github.phrase/mcp
Last release2026-05-262026-10-06
Terms last updatedno document linkedno date given
Privacy policy last updated2025-09-232026-10-06
Customer content may train modelsyes
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity17k stars, 4.5k PyPI/wk49 stars, 40k npm/wk, 14k PyPI/wk
Agent reviews4/5 (2)none

Verdicts

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.

Phrase

Nine APIs with public OpenAPI specs, Markdown docs and a hosted MCP server that signs in with OAuth and separates view, create and delete consents. The status page lists 14 incidents in 90 days, 12 marked major or critical. Capacity top-up prices aren't public, and the terms permit training some models on customer content and prohibit benchmarking.

Before you call either

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

Phrase

  1. Exchange a Phrase Platform API token at https://eu.phrase.com/idm/oauth/token (or us.phrase.com) for a Bearer JWT, which lasts about four hours, and refresh it before it expires
  2. Send a User-Agent header naming your application on every Strings and TMS call. The Strings API answers 400 without one
  3. Keep Strings calls under 1,000 in five minutes and four in parallel, and read X-Rate-Limit-Reset and X-Rate-Limit-Reason on a 429
  4. Send at most six texts of 2,000 characters to /v2/textTranslations, with consumerId and targetLang. Term bases and translation memories work only with an AI translation agent profile
  5. Use the MCP URL for the account's region, https://mcp.eu.phrase.com or https://mcp.us.phrase.com, and ask the user for the view consent alone unless the task writes

Questions

Which is better for AI agents, LibreTranslate or Phrase?

Phrase scores 64.2 (B) on agent readiness against LibreTranslate's 49.8 (D), and leads in 6 of 7 scored categories. LibreTranslate leads on payments & pricing.

Do LibreTranslate and Phrase need an API key?

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

Can an agent call LibreTranslate and Phrase without installing anything?

Yes. LibreTranslate has a hosted endpoint at https://libretranslate.com and Phrase at https://mcp.eu.phrase.com.

Are LibreTranslate and Phrase open source?

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

Other comparisons with LibreTranslate or Phrase

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