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JSONPlaceholder vs User Agent Lookup API

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

APIJSONPlaceholderHEALTHY95User Agent Lookup APIHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms401426
P95 · ms1096764
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit1000 req/window · 999 remaining · resets 1783509378Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

JSONPlaceholder vs User Agent Lookup API: common questions

Which is more reliable, JSONPlaceholder or User Agent Lookup API?

Both are neck-and-neck — JSONPlaceholder and User Agent Lookup API each measure 100% 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, JSONPlaceholder or User Agent Lookup API?

JSONPlaceholder has the lower median latency in our checks — JSONPlaceholder responds in 401 ms versus User Agent Lookup API at 426 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 JSONPlaceholder and User Agent Lookup API need an API key?

Neither needs a paid key — JSONPlaceholder is callable with no signup, and User Agent Lookup API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call JSONPlaceholder and User Agent Lookup API from the browser?

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

Are JSONPlaceholder and User Agent Lookup API free for commercial use?

JSONPlaceholder has unclear commercial terms, and User Agent Lookup API 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.