caldays vs Telegraph
Same instrument, two spec sheets — measured, not claimed.
caldays vs Telegraph: common questions
Which is more reliable, caldays or Telegraph?
Both are neck-and-neck — caldays and Telegraph 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 Telegraph?
caldays has the lower median latency in our checks — caldays responds in 217 ms versus Telegraph at 444 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 Telegraph need an API key?
caldays needs no key, while Telegraph requires a free API key. If you want to start calling without signup, reach for caldays first.
Can I call caldays and Telegraph from the browser?
Yes — both caldays and Telegraph 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 Telegraph free for commercial use?
caldays has unclear commercial terms, and Telegraph 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.