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Public Time API vs Slack

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

APIPublic Time APINEW—SlackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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?

On our scheduled checks, Slack leads on measured uptime — Public Time API at —% versus Slack at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

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.