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Crates.io vs Randommer

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

APICrates.ioNEW—RandommerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crates.io vs Randommer: common questions

Which is more reliable, Crates.io or Randommer?

On our scheduled checks, Randommer leads on measured uptime — Crates.io at —% versus Randommer 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 Crates.io and Randommer need an API key?

Crates.io needs no key, while Randommer requires a free API key. If you want to start calling without signup, reach for Crates.io first.

Can I call Crates.io and Randommer from the browser?

Yes — both Crates.io and Randommer 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 Crates.io and Randommer free for commercial use?

Crates.io has unclear commercial terms, and Randommer 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.