Make Senders Pay or Solve CAPTCHA to Reach Your Inbox

Make people pay to get into your inbox

I built Captchainbox to stop AI cold spam from flooding your inbox. Unknown senders must solve a CAPTCHA or pay a small fee to get through, while trusted contacts arrive as usual. This tool scans metadata without reading your messages, archiving unverified emails instead of deleting them. All fees are donated to The Internet Archive and the Electronic Frontier Foundation, helping you reclaim your time and attention.

"AI cold outreach is nearly free. Make senders work for your time and attention."