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CEORater API vs F1 API

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

APICEORater APINEW—F1 APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CEORater API vs F1 API: common questions

Which is more reliable, CEORater API or F1 API?

On our scheduled checks, F1 API leads on measured uptime — CEORater API at —% versus F1 API 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 CEORater API and F1 API need an API key?

Neither needs a paid key — CEORater API is callable with no signup, and F1 API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call CEORater API and F1 API from the browser?

Only F1 API is browser-friendly — it returns CORS headers over HTTPS. CEORater API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are CEORater API and F1 API free for commercial use?

CEORater API has unclear commercial terms, and F1 API 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.