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Lookup.im API vs Sofiaplan

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

APILookup.im APINEW—SofiaplanNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Lookup.im API vs Sofiaplan: common questions

Which is more reliable, Lookup.im API or Sofiaplan?

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

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

Can I call Lookup.im API and Sofiaplan from the browser?

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

Are Lookup.im API and Sofiaplan free for commercial use?

Lookup.im API has unclear commercial terms, and Sofiaplan 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.