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CarsXE vs OpenSky Network

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

APICarsXEDEAD0OpenSky NetworkDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearno
Data licenseUnverifiedNon-commercial/research use per OpenSky terms
Free tierFree tier — API key requiredFree for non-commercial/research use; anonymous requests are rate-limited and time-coarsened
Rate limitUnpublishedAnonymous access throttled; registered/OAuth users get higher limits
In directory since2026-07-052026-07-05
operationalpartialdownno data

CarsXE vs OpenSky Network: common questions

Which is more reliable, CarsXE or OpenSky Network?

Both are neck-and-neck — CarsXE and OpenSky Network each measure 0.0% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Do CarsXE and OpenSky Network need an API key?

OpenSky Network needs no key, while CarsXE requires a free API key. If you want to start calling without signup, reach for OpenSky Network first.

Can I call CarsXE and OpenSky Network from the browser?

Neither sends browser-friendly CORS headers reliably, so call CarsXE and OpenSky Network from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are CarsXE and OpenSky Network free for commercial use?

CarsXE has unclear commercial terms, and OpenSky Network is personal/non-commercial only. 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.