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RandomUser vs serpstack

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

APIRandomUserHEALTHY78serpstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms210492
P95 · ms7741442
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (generated data; sample photos governed by UI Faces terms)Unverified
Free tierFree — no key or signupFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

RandomUser vs serpstack: common questions

Which is more reliable, RandomUser or serpstack?

On our scheduled checks, RandomUser leads on measured uptime — RandomUser at 100% versus serpstack 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, RandomUser or serpstack?

RandomUser has the lower median latency in our checks — RandomUser responds in 210 ms versus serpstack at 492 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 RandomUser and serpstack need an API key?

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

Can I call RandomUser and serpstack from the browser?

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

Are RandomUser and serpstack free for commercial use?

RandomUser has unclear commercial terms, and serpstack 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.