arcsecond.io vs Newton
Same instrument, two spec sheets — measured, not claimed.
arcsecond.io vs Newton: common questions
Which is more reliable, arcsecond.io or Newton?
Both are neck-and-neck — arcsecond.io and Newton each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, arcsecond.io or Newton?
Newton has the lower median latency in our checks — arcsecond.io responds in 587 ms versus Newton at 323 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 arcsecond.io and Newton need an API key?
Neither needs a paid key — arcsecond.io is callable with no signup, and Newton is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call arcsecond.io and Newton from the browser?
Yes — both arcsecond.io and Newton 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 Newton free for commercial use?
arcsecond.io has unclear commercial terms, and Newton 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.