Launch Library 2 vs Open Notify
Same instrument, two spec sheets — measured, not claimed.
Launch Library 2 vs Open Notify: common questions
Which is more reliable, Launch Library 2 or Open Notify?
On our scheduled checks, Open Notify leads on measured uptime — Launch Library 2 at 3.9% versus Open Notify at 71.6% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Launch Library 2 or Open Notify?
Open Notify has the lower median latency in our checks — Launch Library 2 responds in 546 ms versus Open Notify at 241 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do Launch Library 2 and Open Notify need an API key?
Neither needs a paid key — Launch Library 2 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 Launch Library 2 and Open Notify from the browser?
Only Launch Library 2 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 Launch Library 2 and Open Notify free for commercial use?
Launch Library 2 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.