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RSQ API vs SEO Score

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

APIRSQ APIHEALTHY91SEO ScoreHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms783634
P95 · ms13871704
AuthnoneapiKey
CORSyesno
HTTPSnoyes
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

RSQ API vs SEO Score: common questions

Which is more reliable, RSQ API or SEO Score?

Both are neck-and-neck — RSQ API and SEO Score each measure 100% 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, RSQ API or SEO Score?

SEO Score has the lower median latency in our checks — RSQ API responds in 783 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 RSQ API and SEO Score need an API key?

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

Can I call RSQ API and SEO Score from the browser?

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

Are RSQ API and SEO Score free for commercial use?

RSQ API 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.