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Public Time API vs Slack

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

APIPublic Time APIHEALTHY98SlackHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms242324
P95 · ms382808
AuthnoneapiKey
CORSnoyes
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

Public Time API vs Slack: common questions

Which is more reliable, Public Time API or Slack?

Both are neck-and-neck — Public Time API and Slack 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, Public Time API or Slack?

Public Time API has the lower median latency in our checks — Public Time API responds in 242 ms versus Slack at 324 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 Public Time API and Slack need an API key?

Public Time API needs no key, while Slack requires a free API key. If you want to start calling without signup, reach for Public Time API first.

Can I call Public Time API and Slack from the browser?

Only Slack is browser-friendly — it returns CORS headers over HTTPS. Public Time API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Public Time API and Slack free for commercial use?

Public Time API has unclear commercial terms, and Slack 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.