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Guerrilla Mail vs Lobsters

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

APIGuerrilla MailNEW—LobstersNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Guerrilla Mail vs Lobsters: common questions

Which is more reliable, Guerrilla Mail or Lobsters?

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

Neither needs a paid key — Guerrilla Mail is callable with no signup, and Lobsters is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Guerrilla Mail and Lobsters from the browser?

Only Guerrilla Mail 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 Guerrilla Mail and Lobsters free for commercial use?

Guerrilla Mail has unclear commercial terms, and Lobsters 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.