AZ511 vs ProblemsByVin
Same instrument, two spec sheets — measured, not claimed.
AZ511 vs ProblemsByVin: common questions
Which is more reliable, AZ511 or ProblemsByVin?
On our scheduled checks, ProblemsByVin leads on measured uptime — AZ511 at 95.1% versus ProblemsByVin at 100% 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 ProblemsByVin?
ProblemsByVin has the lower median latency in our checks — AZ511 responds in 2272 ms versus ProblemsByVin at 738 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 ProblemsByVin need an API key?
ProblemsByVin needs no key, while AZ511 requires a free API key. If you want to start calling without signup, reach for ProblemsByVin first.
Can I call AZ511 and ProblemsByVin from the browser?
Only ProblemsByVin 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 ProblemsByVin free for commercial use?
AZ511 has unclear commercial terms, and ProblemsByVin allows commercial use on its free tier. 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.