LibreTranslate
by LibreTranslate · Self-hosted open source machine translation API
BenchRank score
Screenshots of LibreTranslate
Homepage
Overview
LibreTranslate is an open source machine translation API that translates text and files between roughly 50 languages, with an auto-detect option for the source language. Requests POST a JSON body with source, target, format and an optional alternatives count to a /translate endpoint. It can be downloaded and run as your own server, and is powered by Argos Translate.
- Best for
- Developers who want a self-hosted, offline-capable machine translation API.
- Pricing
- No prices are shown; the page states the software is free to download and open source under AGPLv3, while the hosted API asks for an API key.
- Runs on
- Self-hosted
Strengths and trade-offs
Strengths
- Free to download and run as your own API server
- Stated as offline capable once self-hosted
- Open source under AGPLv3
- Around 50 languages, with auto source detection
Trade-offs
- AGPLv3 copyleft may not suit closed-source products
- Hosted translate box caps input at 2,000 characters
- Hosted API requires an API key; no pricing shown
How LibreTranslate markets itself
A structured read of the promise, proof and page design on LibreTranslate’s captured homepage.
Homepage capture
“Open Source Machine Translation API”
- Angle: Open source / ownership
- Hero: Interactive demo
Pricing
Published plans and prices from LibreTranslate’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
Openness
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
Maintenance
Release cadence and repository activity. Scored and shown, but not part of the composite — it is only measurable for open repositories.
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Where this comes from
The LibreTranslate pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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