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restful-api.dev vs User Agent Lookup API

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

APIrestful-api.devNEW—User Agent Lookup APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

restful-api.dev vs User Agent Lookup API: common questions

Which is more reliable, restful-api.dev or User Agent Lookup API?

On our scheduled checks, User Agent Lookup API leads on measured uptime — restful-api.dev at —% versus User Agent Lookup API at —% 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 restful-api.dev and User Agent Lookup API need an API key?

Neither needs a paid key — restful-api.dev 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 restful-api.dev and User Agent Lookup API from the browser?

Only restful-api.dev 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 restful-api.dev and User Agent Lookup API free for commercial use?

restful-api.dev 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.