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Guerrilla Mail vs ImprovMX API

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

APIGuerrilla MailNEW—ImprovMX APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublished301 req/window · 300 remaining · resets 1783526520
In directory since2026-07-052026-07-05
operationalpartialdownno data

Guerrilla Mail vs ImprovMX API: common questions

Which is more reliable, Guerrilla Mail or ImprovMX API?

On our scheduled checks, ImprovMX API leads on measured uptime — Guerrilla Mail at —% versus ImprovMX API 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 Guerrilla Mail and ImprovMX API need an API key?

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

Can I call Guerrilla Mail and ImprovMX API from the browser?

Yes — both Guerrilla Mail and ImprovMX API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Guerrilla Mail and ImprovMX API free for commercial use?

Guerrilla Mail has unclear commercial terms, and ImprovMX API 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.