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AZ511 vs Transport for London, England

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

APIAZ511HEALTHY77Transport for London, EnglandHEALTHY77
Uptime · 30d
Uptime · 90d95.1%68.6%
Uptime · 30d95.0%46.7%
P50 · ms2272316
P95 · ms4610732
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AZ511 vs Transport for London, England: common questions

Which is more reliable, AZ511 or Transport for London, England?

On our scheduled checks, AZ511 leads on measured uptime — AZ511 at 95.1% versus Transport for London, England at 68.6% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, AZ511 or Transport for London, England?

Transport for London, England has the lower median latency in our checks — AZ511 responds in 2272 ms versus Transport for London, England at 316 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do AZ511 and Transport for London, England need an API key?

Both ask you to authenticate — AZ511 uses an API key and Transport for London, England 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 AZ511 and Transport for London, England from the browser?

Only Transport for London, England is browser-friendly — it returns CORS headers over HTTPS. AZ511 needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are AZ511 and Transport for London, England free for commercial use?

AZ511 has unclear commercial terms, and Transport for London, England 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.