Protecting 971,060 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.
encrypted compressed file
Learn how to safely handle an encrypted compressed file in Gmail and Outlook. Understand the risks, compare formats, and secure your inbox from hidden threats.
is junk mail the same as spam
Is junk mail the same as spam? Understand the key differences for security, why it matters for Gmail & Outlook, and how to manage your inbox effectively.
team email management
Master team email management with our security guide. Design policies, build secure inboxes, and use allow-listing to stop spam & phishing.
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
