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Crates.io vs Userstack

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

APICrates.ioHEALTHY90UserstackHEALTHY93
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d100%98.3%
P50 · ms458443
P95 · ms13173029
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 Userstack: common questions

Which is more reliable, Crates.io or Userstack?

Both are neck-and-neck — Crates.io and Userstack each measure 99.02% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Crates.io or Userstack?

Userstack has the lower median latency in our checks — Crates.io responds in 458 ms versus Userstack at 443 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Crates.io and Userstack need an API key?

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

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

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

Crates.io has unclear commercial terms, and Userstack 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.