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ProblemsByVin vs Road511

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

APIProblemsByVinNEW—Road511NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0Unverified
Free tierFree (weekly-refreshed static JSON datasets)Free tier — API key required
Rate limitUnpublished (static JSON files)70 req/window · 69 remaining · resets 1783522019
In directory since2026-07-052026-07-05
operationalpartialdownno data

ProblemsByVin vs Road511: common questions

Which is more reliable, ProblemsByVin or Road511?

On our scheduled checks, Road511 leads on measured uptime — ProblemsByVin at —% versus Road511 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 ProblemsByVin and Road511 need an API key?

ProblemsByVin needs no key, while Road511 requires a free API key. If you want to start calling without signup, reach for ProblemsByVin first.

Can I call ProblemsByVin and Road511 from the browser?

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

Are ProblemsByVin and Road511 free for commercial use?

ProblemsByVin allows commercial use on its free tier, and Road511 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.