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apilayer aviationstack vs AZ511

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

APIapilayer aviationstackNEW—AZ511NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

apilayer aviationstack vs AZ511: common questions

Which is more reliable, apilayer aviationstack or AZ511?

On our scheduled checks, AZ511 leads on measured uptime — apilayer aviationstack at —% versus AZ511 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 apilayer aviationstack and AZ511 need an API key?

Both ask you to authenticate — apilayer aviationstack uses an API key and AZ511 uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call apilayer aviationstack and AZ511 from the browser?

Neither sends browser-friendly CORS headers reliably, so call apilayer aviationstack and AZ511 from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are apilayer aviationstack and AZ511 free for commercial use?

apilayer aviationstack has unclear commercial terms, and AZ511 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.