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SEO Score vs serpstack

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

APISEO ScoreNEW—serpstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

SEO Score vs serpstack: common questions

Which is more reliable, SEO Score or serpstack?

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

Both ask you to authenticate — SEO Score uses an API key and serpstack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call SEO Score and serpstack from the browser?

Neither sends browser-friendly CORS headers reliably, so call SEO Score and serpstack from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are SEO Score and serpstack free for commercial use?

SEO Score has unclear commercial terms, and serpstack 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.