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Nationalize.io vs SEO Score

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

APINationalize.ioNEW—SEO ScoreNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierKeyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free keyFree tier — API key required
Rate limitKeyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headersUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Nationalize.io vs SEO Score: common questions

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

On our scheduled checks, SEO Score leads on measured uptime — Nationalize.io 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 Nationalize.io and SEO Score need an API key?

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

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

Only Nationalize.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 Nationalize.io and SEO Score free for commercial use?

Nationalize.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.