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APIs.guru vs LibreTranslate

Same instrument, two spec sheets — measured, not claimed.

APIAPIs.guruHEALTHY97LibreTranslateHEALTHY92
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms266619
P95 · ms14211474
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (software is AGPL-3.0)
Free tierFree and open, no keyFree — /languages is keyless; hosted /translate may require a key or donation
Rate limitUnpublishedUnpublished (per hosted instance)
In directory since2026-07-052026-07-05
operationalpartialdownno data

APIs.guru vs LibreTranslate: common questions

Which is more reliable, APIs.guru or LibreTranslate?

Both are neck-and-neck — APIs.guru and LibreTranslate each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, APIs.guru or LibreTranslate?

APIs.guru has the lower median latency in our checks — APIs.guru responds in 266 ms versus LibreTranslate at 619 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do APIs.guru and LibreTranslate need an API key?

Neither needs a paid key — APIs.guru is callable with no signup, and LibreTranslate is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call APIs.guru and LibreTranslate from the browser?

Yes — both APIs.guru and LibreTranslate send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are APIs.guru and LibreTranslate free for commercial use?

APIs.guru has unclear commercial terms, and LibreTranslate has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.