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Open Topo Data vs Zipcodestack

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

APIOpen Topo DataNEW—ZipcodestackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
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

Open Topo Data vs Zipcodestack: common questions

Which is more reliable, Open Topo Data or Zipcodestack?

On our scheduled checks, Zipcodestack leads on measured uptime — Open Topo Data 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 Open Topo Data and Zipcodestack need an API key?

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

Can I call Open Topo Data and Zipcodestack from the browser?

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

Are Open Topo Data and Zipcodestack free for commercial use?

Open Topo Data 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.