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Road511 vs Smartcar

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

APIRoad511DEAD0SmartcarDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limit70 req/window · 69 remaining · resets 1783522019Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Road511 vs Smartcar: common questions

Which is more reliable, Road511 or Smartcar?

Both are neck-and-neck — Road511 and Smartcar 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 Road511 and Smartcar need an API key?

Both ask you to authenticate — Road511 uses an API key and Smartcar 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 Road511 and Smartcar from the browser?

Only Road511 is browser-friendly — it returns CORS headers over HTTPS. Smartcar needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Road511 and Smartcar free for commercial use?

Road511 has unclear commercial terms, and Smartcar 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.