caldays vs Church Calendar
Same instrument, two spec sheets — measured, not claimed.
caldays vs Church Calendar: common questions
Which is more reliable, caldays or Church Calendar?
Both are neck-and-neck — caldays and Church Calendar 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, caldays or Church Calendar?
caldays has the lower median latency in our checks — caldays responds in 149 ms versus Church Calendar at 848 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 caldays and Church Calendar need an API key?
Neither needs a paid key — caldays is callable with no signup, and Church Calendar is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call caldays and Church Calendar from the browser?
Only caldays is browser-friendly — it returns CORS headers over HTTPS. Church Calendar needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are caldays and Church Calendar free for commercial use?
caldays has unclear commercial terms, and Church Calendar 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.