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ipapi.co vs Zipcodestack

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

APIipapi.coNEW—ZipcodestackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — quota not published; returns 429 when exceededFree tier — API key required
Rate limitUnpublished (429 Quota exceeded)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ipapi.co vs Zipcodestack: common questions

Which is more reliable, ipapi.co or Zipcodestack?

On our scheduled checks, Zipcodestack leads on measured uptime — ipapi.co at —% versus Zipcodestack 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 ipapi.co and Zipcodestack need an API key?

ipapi.co needs no key, while Zipcodestack requires a free API key. If you want to start calling without signup, reach for ipapi.co first.

Can I call ipapi.co and Zipcodestack from the browser?

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

Are ipapi.co and Zipcodestack free for commercial use?

ipapi.co has unclear commercial terms, and Zipcodestack 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.