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ISRO vs Satellite Passes

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

APIISRONEW—Satellite PassesNEW—
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

ISRO vs Satellite Passes: common questions

Which is more reliable, ISRO or Satellite Passes?

On our scheduled checks, Satellite Passes leads on measured uptime — ISRO at —% versus Satellite Passes 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 ISRO and Satellite Passes need an API key?

Neither needs a paid key — ISRO is callable with no signup, and Satellite Passes is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ISRO and Satellite Passes from the browser?

Yes — both ISRO and Satellite Passes 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 ISRO and Satellite Passes free for commercial use?

ISRO has unclear commercial terms, and Satellite Passes 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.