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CEORater API vs OpenF1

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

APICEORater APINEW—OpenF1NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree & open (historical); real-time may require a free account
Rate limitUnpublishedRetry-After: 60s
In directory since2026-07-052026-07-05
operationalpartialdownno data

CEORater API vs OpenF1: common questions

Which is more reliable, CEORater API or OpenF1?

On our scheduled checks, OpenF1 leads on measured uptime — CEORater API at —% versus OpenF1 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 OpenF1 need an API key?

Neither needs a paid key — CEORater API is callable with no signup, and OpenF1 is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call CEORater API and OpenF1 from the browser?

Only OpenF1 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 OpenF1 free for commercial use?

CEORater API has unclear commercial terms, and OpenF1 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.