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caldays vs X (Twitter) API

Same instrument, two spec sheets — measured, not claimed.

APIcaldaysHEALTHY99X (Twitter) APIHEALTHY95
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms149392
P95 · ms6751148
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

caldays vs X (Twitter) API: common questions

Which is more reliable, caldays or X (Twitter) API?

Both are neck-and-neck — caldays and X (Twitter) API 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 X (Twitter) API?

caldays has the lower median latency in our checks — caldays responds in 149 ms versus X (Twitter) API at 392 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 X (Twitter) API need an API key?

caldays needs no key, while X (Twitter) API requires a free API key. If you want to start calling without signup, reach for caldays first.

Can I call caldays and X (Twitter) API from the browser?

Yes — both caldays and X (Twitter) API 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 X (Twitter) API free for commercial use?

caldays has unclear commercial terms, and X (Twitter) API 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.