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APIs.guru vs FastApi Simple Calculator

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

APIAPIs.guruNEW—FastApi Simple CalculatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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 FastApi Simple Calculator: common questions

Which is more reliable, APIs.guru or FastApi Simple Calculator?

On our scheduled checks, FastApi Simple Calculator leads on measured uptime — APIs.guru at —% versus FastApi Simple Calculator at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do APIs.guru and FastApi Simple Calculator need an API key?

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

Can I call APIs.guru and FastApi Simple Calculator from the browser?

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

Are APIs.guru and FastApi Simple Calculator free for commercial use?

APIs.guru has unclear commercial terms, and FastApi Simple Calculator 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.