caldays vs The Calendar
Same instrument, two spec sheets — measured, not claimed.
caldays vs The Calendar: common questions
Which is more reliable, caldays or The Calendar?
Both are neck-and-neck — caldays and The 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 The Calendar?
caldays has the lower median latency in our checks — caldays responds in 149 ms versus The Calendar at 588 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 The Calendar need an API key?
Neither needs a paid key — caldays is callable with no signup, and The Calendar is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call caldays and The Calendar from the browser?
Yes — both caldays and The Calendar 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 caldays and The Calendar free for commercial use?
caldays has unclear commercial terms, and The 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.