arcsecond.io vs ITIS
Same instrument, two spec sheets — measured, not claimed.
arcsecond.io vs ITIS: common questions
Which is more reliable, arcsecond.io or ITIS?
On our scheduled checks, arcsecond.io leads on measured uptime — arcsecond.io at 100% versus ITIS at 97.1% 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, arcsecond.io or ITIS?
arcsecond.io has the lower median latency in our checks — arcsecond.io responds in 587 ms versus ITIS at 1767 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 ITIS need an API key?
Neither needs a paid key — arcsecond.io is callable with no signup, and ITIS is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call arcsecond.io and ITIS from the browser?
Only arcsecond.io is browser-friendly — it returns CORS headers over HTTPS. ITIS needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are arcsecond.io and ITIS free for commercial use?
arcsecond.io has unclear commercial terms, and ITIS 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.