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ip.app vs SLF

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

APIip.appNEW—SLFNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — static file, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ip.app vs SLF: common questions

Which is more reliable, ip.app or SLF?

On our scheduled checks, SLF leads on measured uptime — ip.app 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 ip.app and SLF need an API key?

Neither needs a paid key — ip.app is callable with no signup, and SLF is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ip.app and SLF from the browser?

Yes — both ip.app 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 ip.app and SLF free for commercial use?

ip.app 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.