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OpenSky Network vs Transport for United States

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

APIOpenSky NetworkNEW—Transport for United StatesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial usenounclear
Data licenseNon-commercial/research use per OpenSky termsData copyright transit agencies / Umo IQ
Free tierFree for non-commercial/research use; anonymous requests are rate-limited and time-coarsenedFree — limits not published
Rate limitAnonymous access throttled; registered/OAuth users get higher limitsUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenSky Network vs Transport for United States: common questions

Which is more reliable, OpenSky Network or Transport for United States?

On our scheduled checks, Transport for United States leads on measured uptime — OpenSky Network at —% versus Transport for United States 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 OpenSky Network and Transport for United States need an API key?

Neither needs a paid key — OpenSky Network is callable with no signup, and Transport for United States is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call OpenSky Network and Transport for United States from the browser?

Only Transport for United States is browser-friendly — it returns CORS headers over HTTPS. OpenSky Network needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are OpenSky Network and Transport for United States free for commercial use?

OpenSky Network is personal/non-commercial only, and Transport for United States 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.