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ItsThisForThat vs Userstack

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

APIItsThisForThatHEALTHY98UserstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms242443
P95 · ms5553029
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublished (docs ask you not to hammer it)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ItsThisForThat vs Userstack: common questions

Which is more reliable, ItsThisForThat or Userstack?

On our scheduled checks, ItsThisForThat leads on measured uptime — ItsThisForThat at 100% versus Userstack at 99.02% 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, ItsThisForThat or Userstack?

ItsThisForThat has the lower median latency in our checks — ItsThisForThat responds in 242 ms versus Userstack at 443 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 ItsThisForThat and Userstack need an API key?

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

Can I call ItsThisForThat and Userstack from the browser?

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

Are ItsThisForThat and Userstack free for commercial use?

ItsThisForThat has unclear commercial terms, and Userstack 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.