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FingerprintJS Pro vs SniffCat

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

APIFingerprintJS ProDEAD0SniffCatREACHABLE83
Uptime · 30d
Uptime · 90d0.0%83.3%
Uptime · 30d0.0%83.3%
P50 · ms—290
P95 · ms—598
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverified
Free tierFree tier — API key required
Rate limitUnpublishedRetry-After: 24s
In directory since2026-07-052026-08-19
operationalpartialdownno data

FingerprintJS Pro vs SniffCat: common questions

Which is more reliable, FingerprintJS Pro or SniffCat?

On our scheduled checks, SniffCat leads on measured uptime — FingerprintJS Pro at 0.0% versus SniffCat at 83.3% 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 FingerprintJS Pro and SniffCat need an API key?

Both ask you to authenticate — FingerprintJS Pro uses an API key and SniffCat 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 FingerprintJS Pro and SniffCat from the browser?

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

Are FingerprintJS Pro and SniffCat free for commercial use?

FingerprintJS Pro has unclear commercial terms, and SniffCat 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.