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DummyJSON vs Userstack

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

APIDummyJSONHEALTHY98UserstackHEALTHY93
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d100%98.3%
P50 · ms32443
P95 · ms11133029
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no keyFree tier — API key required
Rate limit100 req/window · 99 remaining · resets 1783510243Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

DummyJSON vs Userstack: common questions

Which is more reliable, DummyJSON or Userstack?

Both are neck-and-neck — DummyJSON and Userstack each measure 99.02% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, DummyJSON or Userstack?

DummyJSON has the lower median latency in our checks — DummyJSON responds in 32 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 DummyJSON and Userstack need an API key?

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

Can I call DummyJSON and Userstack from the browser?

Yes — both DummyJSON and Userstack send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are DummyJSON and Userstack free for commercial use?

DummyJSON 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.