Say it to them. Only them.
One-to-one and group chat, voice and video calls on a post-quantum secure line, with no one in the middle.
Everything you expect. Nothing watching.
Calls on a secure line too.
Voice and video, one-to-one or in a group, with screen sharing. Everyone on a call sees the same code to compare; it changes when someone joins or leaves.
- Rings on every device you choose
- Switch from phone to laptop mid-call
- Never recorded, never a link for outsiders
Know who you’re really talking to.
Add people by exact username; they accept first. Compare codes in person once and LMN8 shows them as verified; a changed key is flagged before you trust it.
Clear a chat everywhere, even offline.
LMN8 destroys a key instead of chasing copies, so a cleared chat becomes unreadable on every device, including ones that are offline, within the day.
No app can undo a screenshot or a photo of a screen. We say so where it matters.
In the apps, on every device you own.
Not on the web: the website is for your account and files.
- Windows
- macOS
- Linux
- Android
- iPhone
The detail, in plain words.
The standards behind chat and calls, and where they stop.
MLS (RFC 9420) with a post-quantum cipher suite (ML-KEM-1024, AES-256-GCM, SHA-384, ML-DSA-87; the suite’s code point is from an IETF draft and may change once).
SFrame (RFC 9605) keyed from the chat; calls only start in a post-quantum chat.
The server keeps encrypted history without a key to it; “delete for everyone” destroys a key so offline copies become unreadable too (within the 24-hour offline window).
Uncollected messages deleted after 30 days.
Chat and calls live in the apps; the website is for your account.
Yes. Every chat, of two people or many, agrees its own keys on its members’ devices, and each message is encrypted for the people in it. The same post-quantum encryption protects both.
Yes. There are no guests or call links: everyone in a chat or call has the app and an account. Chat and calls are on the free plan, so nobody has to pay to talk to you.
Your account and files are on the web. Chat and calls live in the apps for Windows, macOS, Linux, Android and iPhone.
Yes, on every device in the chat, when the timer ends or after one read. No app can undo a screenshot or a photo of a screen, and we won’t pretend otherwise.
It depends on your plan: up to 500 members on the largest. The plans page lists the limit on each.