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Ducks Unlimited vs Open Topo Data

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

APIDucks UnlimitedNEW—Open Topo DataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
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

Ducks Unlimited vs Open Topo Data: common questions

Which is more reliable, Ducks Unlimited or Open Topo Data?

On our scheduled checks, Open Topo Data leads on measured uptime — Ducks Unlimited at —% versus Open Topo Data 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 Ducks Unlimited and Open Topo Data need an API key?

Neither needs a paid key — Ducks Unlimited is callable with no signup, and Open Topo Data is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Ducks Unlimited and Open Topo Data from the browser?

Only Ducks Unlimited 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 Ducks Unlimited and Open Topo Data free for commercial use?

Ducks Unlimited has unclear commercial terms, and Open Topo Data 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.