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Church Calendar vs Guerrilla Mail

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

APIChurch CalendarNEW—Guerrilla MailNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSnoyes
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

Church Calendar vs Guerrilla Mail: common questions

Which is more reliable, Church Calendar or Guerrilla Mail?

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

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

Can I call Church Calendar and Guerrilla Mail from the browser?

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

Are Church Calendar and Guerrilla Mail free for commercial use?

Church Calendar has unclear commercial terms, and Guerrilla Mail 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.