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PostStack vs Kickbox

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

APIPostStackNEW—KickboxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — open disposable-address check
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PostStack vs Kickbox: common questions

Which is more reliable, PostStack or Kickbox?

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

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

Can I call PostStack and Kickbox from the browser?

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

Are PostStack and Kickbox free for commercial use?

PostStack has unclear commercial terms, and Kickbox 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.