Captchainbox - Make senders work to get into your inbox

Stop AI cold spamStop AI spam from flooding your inbox and calendar. Unknown senders solve a CAPTCHA or pay a fee to get in. Trusted contacts get through as usual.OtherSoonSee how it works7-day free trial · 5-minute setup · Archived, never deleted2 awaiting verificationProceedings are donated toPooled and donated annually, 50/50. See the ledger.Built for inboxes overwhelmed by AI outreachAI cold outreach is nearly free. Make senders work for your time and attention.Spam filters catch the obvious, but mass-customized outreach gets through. You miss what matters and drown in what you didn't ask for.Step 01Sign 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.Sign in with your email providerStep 02Every sender checked silently.For every new email Captchainbox checks the sender against your trusted contacts. Unknown senders are archived (never deleted) and sent a verification link. Introductions through trusted contacts get through.See how filtering worksStep 03Senders show they are worth your time and attention.Unknown senders verify through a CAPTCHA or pay a small fee to show they are relevant to you. They complete the verification and their email is delivered to your inbox. Payment fees get pooled and donated.See the verification flow in actionPricingSimple pricing to get back your time and attention.Free 7-day trial, no credit card required.Take back your inbox.Set up in 5 minutes. Free to get started.OtherSoonCurious what senders see? Send me an email and see the verification flow yourself.