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APIs.guru vs ReqRes

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

APIAPIs.guruHEALTHY97ReqResHEALTHY98
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms266256
P95 · ms1421582
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree and open, no keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

APIs.guru vs ReqRes: common questions

Which is more reliable, APIs.guru or ReqRes?

Both are neck-and-neck — APIs.guru and ReqRes 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 ReqRes?

ReqRes has the lower median latency in our checks — APIs.guru responds in 266 ms versus ReqRes at 256 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 ReqRes need an API key?

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

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

Only APIs.guru is browser-friendly — it returns CORS headers over HTTPS. ReqRes needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are APIs.guru and ReqRes free for commercial use?

APIs.guru has unclear commercial terms, and ReqRes 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.