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Resend vs Kickbox

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

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

Resend vs Kickbox: common questions

Which is more reliable, Resend or Kickbox?

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

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

Can I call Resend and Kickbox from the browser?

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

Are Resend and Kickbox free for commercial use?

Resend 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.