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Adoptium vs Crates.io

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

APIAdoptiumNEW—Crates.ioNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
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

Adoptium vs Crates.io: common questions

Which is more reliable, Adoptium or Crates.io?

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

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

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

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

Adoptium has unclear commercial terms, and Crates.io 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.