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IP Address API vs IsItWater

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

APIIP Address APINEW—IsItWaterNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
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

IP Address API vs IsItWater: common questions

Which is more reliable, IP Address API or IsItWater?

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

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

Can I call IP Address API and IsItWater from the browser?

Only IP Address API is browser-friendly — it returns CORS headers over HTTPS. IsItWater needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are IP Address API and IsItWater free for commercial use?

IP Address API has unclear commercial terms, and IsItWater 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.