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Lobsters vs PostStack

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

APILobstersNEW—PostStackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Lobsters vs PostStack: common questions

Which is more reliable, Lobsters or PostStack?

On our scheduled checks, PostStack leads on measured uptime — Lobsters at —% versus PostStack 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 PostStack need an API key?

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

Can I call Lobsters and PostStack from the browser?

Neither sends browser-friendly CORS headers reliably, so call Lobsters and PostStack from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Lobsters and PostStack free for commercial use?

Lobsters has unclear commercial terms, and PostStack 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.