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Lobsters vs Slack

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

APILobstersNEW—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

Lobsters vs Slack: common questions

Which is more reliable, Lobsters or Slack?

On our scheduled checks, Slack leads on measured uptime — Lobsters 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 Lobsters and Slack need an API key?

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

Can I call Lobsters and Slack from the browser?

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

Are Lobsters and Slack free for commercial use?

Lobsters 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.