Stop AI spam from flooding your inbox and calendar. Unknown senders solve a CAPT CHA or pay a fee to get in. Trusted contacts get through as usual.

Step 01: Sign in with your email provider. Captchainbox scans your conversation metadata. We never read your messages. We build a trusted sender and domains list for you.

Step 02: Every new email is checked silently. Unknown senders are archived (never deleted) and sent a verification link. Introductions through trusted contacts get through. Step 03: Senders prove they’re worth your time by completing a CAPT CHA or paying a small fee. Their email then lands in your inbox.

Pricing: Simple pricing to get back your time and attention. 7-day free trial, no credit card required. Set up in 5-minute setup hypothetical. Payment fees are pooled and donated 50/50. Curious what senders see? Send me an email and see the verification flow yourself.