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npm Registry vs SEO Score

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

APInpm RegistryNEW—SEO ScoreNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree (public registry)Free tier — API key required
Rate limitUnpublished (bulk scraping discouraged)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

npm Registry vs SEO Score: common questions

Which is more reliable, npm Registry or SEO Score?

On our scheduled checks, SEO Score leads on measured uptime — npm Registry at —% versus SEO Score 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 npm Registry and SEO Score need an API key?

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

Can I call npm Registry and SEO Score from the browser?

Only npm Registry 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 npm Registry and SEO Score free for commercial use?

npm Registry 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.