caldays vs Cisco Spark
Same instrument, two spec sheets — measured, not claimed.
caldays vs Cisco Spark: common questions
Which is more reliable, caldays or Cisco Spark?
Both are neck-and-neck — caldays and Cisco Spark 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 Cisco Spark?
caldays has the lower median latency in our checks — caldays responds in 149 ms versus Cisco Spark at 1608 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 Cisco Spark need an API key?
caldays needs no key, while Cisco Spark requires a free API key. If you want to start calling without signup, reach for caldays first.
Can I call caldays and Cisco Spark from the browser?
Yes — both caldays and Cisco Spark 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 Cisco Spark free for commercial use?
caldays has unclear commercial terms, and Cisco Spark 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.