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Sofiaplan vs Urlbox API

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

APISofiaplanNEW—Urlbox APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
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

Sofiaplan vs Urlbox API: common questions

Which is more reliable, Sofiaplan or Urlbox API?

On our scheduled checks, Urlbox API leads on measured uptime — Sofiaplan at —% versus Urlbox API 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 Sofiaplan and Urlbox API need an API key?

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

Can I call Sofiaplan and Urlbox API from the browser?

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

Are Sofiaplan and Urlbox API free for commercial use?

Sofiaplan has unclear commercial terms, and Urlbox API 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.