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ITIS vs Unusual Units Converter

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

APIITISNEW—Unusual Units ConverterNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
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

ITIS vs Unusual Units Converter: common questions

Which is more reliable, ITIS or Unusual Units Converter?

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

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

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

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

Are ITIS and Unusual Units Converter free for commercial use?

ITIS has unclear commercial terms, and Unusual Units Converter 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.