Stop 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.
See how it works 7-day free trial · 5-minute setup · Archived, never deleted
Sarah Chen
nowsarah@designco.com
Re: new design direction
Built for inboxes overwhelmed by AI outreach
AI 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 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.
Sign in with your email provider Gmail connected
you@gmail.com
Analyzed
2,847
Trusted
284
Status
Active
Step 02
Every 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 works](/auth/sign-in)
Step 03
Senders 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 action
Inbox verification
This inbox uses a quick CAPTCHA. Complete it to get your message delivered.
Recipient picked: CAPTCHAComplete the CAPTCHA
You're verified
Your message is on its way to their inbox.
Pricing
Simple pricing to get back your time and attention. #
Free 7-day trial, no credit card required.
Per inbox
7-day free trial included
- Real-time inbox filtering
- Calendar invite protection
- Trusted circle from sent history
- Introduction detection via CC
- Configurable filter rules
- Custom auto-reply templates
- Emails archived, never deleted
Take back your inbox. #
Set up in 5 minutes. Free to get started.
Curious what senders see? Send me an email and see the verification flow yourself.