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Crates.io vs SEO Score

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

APICrates.ioHEALTHY90SEO ScoreHEALTHY91
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d100%100%
P50 · ms458634
P95 · ms13171704
AuthnoneapiKey
CORSyesno
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 SEO Score: common questions

Which is more reliable, Crates.io or SEO Score?

On our scheduled checks, SEO Score leads on measured uptime — Crates.io at 99.02% versus SEO Score at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Crates.io or SEO Score?

Crates.io has the lower median latency in our checks — Crates.io responds in 458 ms versus SEO Score at 634 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 SEO Score need an API key?

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

Can I call Crates.io and SEO Score from the browser?

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

Are Crates.io and SEO Score free for commercial use?

Crates.io has unclear commercial terms, and SEO Score 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.