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Proweblook IP Checker vs SLF

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

APIProweblook IP CheckerREACHABLE—SLFNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — static file, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Proweblook IP Checker vs SLF: common questions

Which is more reliable, Proweblook IP Checker or SLF?

On our scheduled checks, SLF leads on measured uptime — Proweblook IP Checker at —% versus SLF 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 Proweblook IP Checker and SLF need an API key?

SLF needs no key, while Proweblook IP Checker requires a free API key. If you want to start calling without signup, reach for SLF first.

Can I call Proweblook IP Checker and SLF from the browser?

Yes — both Proweblook IP Checker and SLF send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Proweblook IP Checker and SLF free for commercial use?

Proweblook IP Checker has unclear commercial terms, and SLF 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.