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ip.app vs OpenPLZ API

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

APIip.appNEW—OpenPLZ APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ip.app vs OpenPLZ API: common questions

Which is more reliable, ip.app or OpenPLZ API?

On our scheduled checks, OpenPLZ API leads on measured uptime — ip.app at —% versus OpenPLZ 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 ip.app and OpenPLZ API need an API key?

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

Can I call ip.app and OpenPLZ API from the browser?

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

ip.app has unclear commercial terms, and OpenPLZ 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.