KantYour messages. Nobody else’s.
Kant sends what you write straight to the people you’re talking to — locked on your device, unlocked only on theirs. No phone number. No company server keeping a copy.
- End-to-end encrypted
- No phone number needed
- Free for everyone
- Open source (AGPL-3.0)
Most messaging apps pass every word through their own servers. Kant was built so there’s nothing in the middle that can read it.
Think of it as a sealed envelope.
Even when Kant needs a little help reaching someone, the helper only ever carries a sealed envelope. It can’t open it, and it doesn’t keep it.
Your message waits on a company’s server.
- A copy can sit on their servers
- Usually tied to your phone number
- You rely on the company’s promises
Your message goes straight to Maya.
- Locked on your phone, unlocked only on theirs
- No phone number or email needed
- Nothing readable kept in the middle
Three steps. No sign-up.
- 1
Download and pick a password
That’s the whole setup. No forms, no verification codes, no account to create.
- 2
Share your code
Show your QR code or send your invite link. It works like a phone number that only you control.
- 3
Start talking
Messages, photos, files and group chats — encrypted from the very first word.
Private by default. Simple by design.
Every message gets its own key. Kant changes keys with each message, so even if one were ever exposed, the rest of your conversation stays locked.
No phone number. No email. Your identity lives on your device, protected by your password.
Groups and files. Share photos and documents with one person or a whole group. Big files pick up where they left off if your connection drops.
Works wherever you are. Home Wi-Fi, the office, mobile data — Kant finds a way through, even on strict networks.
Free and open source. No ads, no subscriptions, and no data about you to sell.
Run your own network. Teams can host their own relay. Their servers, their rules.
How relays workExtra-private mode. Optional onion routing makes it far harder to see who you’re talking to — not just what you say.
For anyone who’d rather keep it between us.
Friends & family
Plans, photos and inside jokes stay between the people they’re meant for.
FreeJournalists & sources
Talk to sources without a company holding a record of the conversation.
FreeStudents & researchers
Study, test and build on a modern encrypted messenger with public code.
FreeTeams & organisations
Run Kant on infrastructure you control, so company conversations stay on company terms.
Admin tools availableDon’t take our word for it. Read the code.
Every line of Kant is public on GitHub. Security experts, journalists and anyone curious can see exactly how it works — and help make it better.
Private, end-to-end encrypted messenger. No phone number, no one in the middle.
- packages/coreEncryption and messaging
- packages/appAndroid, desktop and web app
- packages/relayThe relay server
- docs/securityThreat model and data policy
We show our work.
Kant is in public beta. Instead of big promises, we publish exactly what the relay can and can’t see, the threats we’ve planned for, and what’s still to do — including an independent audit.
- Your messages
- Your photos and files
- Your contact list
- Your message history
Good questions. Straight answers.
Is Kant really free?
Yes. Kant is free and open source under the AGPL-3.0, for anyone. Every feature is in the open-source app, with nothing held back behind a paid tier. Organisations that would rather not publish their changes can buy a commercial licence instead.
Do I need a phone number or an email address?
No. The first time you open Kant you choose a password, and the app creates your identity right on your device. You then share your personal key with the people you want to talk to. No phone number, no email, no account.
Can anyone read my messages — even the people who make Kant?
No. Messages are locked on your device and can only be unlocked on the device of the person you sent them to. When a relay helps two devices reach each other, it only ever passes along encrypted data it can't read, and it doesn't keep your message history.
What is a relay?
Phones often sit behind home routers and mobile networks that block direct connections. A relay is a small helper that introduces devices and passes sealed messages between them when a direct line isn't possible — like a sorting office that only ever handles sealed envelopes. Anyone can run their own.
Which devices does Kant work on?
Kant is available today for Android, Linux, Windows, macOS and iPhone. The iPhone app isn't on the App Store yet; you install it with a sideloading app such as AltStore. You can follow progress on the Kant Discord.
Is Kant safe to use today?
Kant is in public beta. It is built on well-studied encryption — the X3DH handshake and the Double Ratchet, the same design Signal made famous — and the code is public so anyone can check it. It hasn't had an independent security audit yet. We say so openly, and you can read the full threat model.
Why does Android warn me when I install it?
Kant isn't on the Google Play Store yet, so Android shows its standard prompt for any app installed directly from the web. That's expected. You can confirm your download is genuine by checking its fingerprint on the download page.
Take back your conversations.
Free and open source. Available today for Android, Linux, Windows, macOS and iPhone.