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Unusual Units Converter vs Open Notify

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

APIUnusual Units ConverterUNMONITORED—Open NotifyDYING—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree — limits not publishedUnlimited (volunteer-run)
Rate limitUnpublishedPlease be gentle
In directory since2026-07-052026-05-02
operationalpartialdownno data

Unusual Units Converter vs Open Notify: common questions

Which is more reliable, Unusual Units Converter or Open Notify?

Only Open Notify is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Unusual Units Converter and Open Notify need an API key?

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

Can I call Unusual Units Converter and Open Notify from the browser?

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

Are Unusual Units Converter and Open Notify free for commercial use?

Unusual Units Converter has unclear commercial terms, and Open Notify 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.