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arcsecond.io vs Launch Library 2

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

APIarcsecond.ioNEW—Launch Library 2NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — no key (The Space Devs LL2)
Rate limitUnpublishedAnonymous requests are throttled to a low rate (see docs)
In directory since2026-07-052026-07-05
operationalpartialdownno data

arcsecond.io vs Launch Library 2: common questions

Which is more reliable, arcsecond.io or Launch Library 2?

On our scheduled checks, Launch Library 2 leads on measured uptime — arcsecond.io at —% versus Launch Library 2 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 arcsecond.io and Launch Library 2 need an API key?

Neither needs a paid key — arcsecond.io is callable with no signup, and Launch Library 2 is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call arcsecond.io and Launch Library 2 from the browser?

Yes — both arcsecond.io and Launch Library 2 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 arcsecond.io and Launch Library 2 free for commercial use?

arcsecond.io has unclear commercial terms, and Launch Library 2 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.