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Unusual Units Converter vs USPTO

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

APIUnusual Units ConverterNEW—USPTONEW—
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

Unusual Units Converter vs USPTO: common questions

Which is more reliable, Unusual Units Converter or USPTO?

On our scheduled checks, USPTO leads on measured uptime — Unusual Units Converter at —% versus USPTO 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 Unusual Units Converter and USPTO need an API key?

Neither needs a paid key — Unusual Units Converter is callable with no signup, and USPTO is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Unusual Units Converter and USPTO from the browser?

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

Are Unusual Units Converter and USPTO free for commercial use?

Unusual Units Converter has unclear commercial terms, and USPTO 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.