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Unusual Units Converter vs NASA APOD

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

APIUnusual Units ConverterUNMONITORED—NASA APODHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic domain (US Gov)
Free tierFree — limits not published1,000 req/hour with free key
Rate limitUnpublishedDEMO_KEY: 30/hour, 50/day
In directory since2026-07-052026-05-02
operationalpartialdownno data

Unusual Units Converter vs NASA APOD: common questions

Which is more reliable, Unusual Units Converter or NASA APOD?

Only NASA APOD 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 NASA APOD need an API key?

Unusual Units Converter needs no key, while NASA APOD requires a free API key. If you want to start calling without signup, reach for Unusual Units Converter first.

Can I call Unusual Units Converter and NASA APOD from the browser?

Yes — both Unusual Units Converter and NASA APOD send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Unusual Units Converter and NASA APOD free for commercial use?

Unusual Units Converter has unclear commercial terms, and NASA APOD allows commercial use on its free tier. 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.