Protecting 967,813 outsider emails for 14 privacy-conscious founders
Turn your email into a VIP channel. Only people in your contact list get through. Everyone else is silently screened out. 100% Signal. Zero Noise.
No card on the connection step. Review trial activation after Gmail or Outlook is linked.
Bank-grade security. Google Verified (CASA Tier 2). We never sell data. We never read emails.
Popular inbox workflows
The tasks executives run before turning on strict contact-based screening.
You wouldn't leave your office door wide open for strangers to walk in and demand your attention. Why do it with your Inbox? KeepKnown is the Executive Assistant that screens every visitor at the door.
Real-time monitoring keeps your inbox clean round-the-clock. Every email is instantly checked against your contacts.
Never miss newly added contacts. Everything syncs automatically from your email provider.
Manage VIP access lists and domain filtering for complete inbox control.
Contacts are hashed for matching and encrypted for debugging. Never stored as plaintext. We never sell or share your data.
Join thousands simplifying their inbox.
0+
emails filtered and counting
See how KeepKnown helps people reclaim their inbox.
"KeepKnown has completely changed how we manage our inbox. We used to waste so much time sorting through junk mail — now it's clean, efficient, and stress-free. The spam control is spot-on, and we finally feel in control of our email again."
Briefings, strategies, and operational updates for inbox security.
contact sync for gmail
Master contact sync for Gmail on any device with our security-first guide. Get setup, troubleshoot, and protect your inbox.
best email client
Find the best email client for security, productivity, and focus. We review 10 top apps for founders, teams, and pros, with tips for Gmail and Outlook.
email security
A prioritized checklist of 10 email security best practices for 2026. Protect your business with actionable advice on DMARC, phishing, 2FA, and allow-listing.
Everything you need to know about privacy, security, and how KeepKnown works.
Still have questions? Contact our support team
Choose the plan that fits your workflow. Connect your inbox first, then activate a 7-day trial with no charge today.
One public inbox protected by default
Less than the cost of 10 minutes of your time.
Billed annually ($276/year, save $72)
Or save $72/year with yearly billing
Create your account first. Add a card after inbox connection; no charge today.
Three inboxes for founders and small teams
Chosen by 13 paying founders
Less than the cost of 10 minutes of your time.
Billed annually ($576/year, save $144)
Or save $144/year with yearly billing
Create your account first. Add a card after inbox connection; no charge today.
For teams & organizations
Tailored to your needs
