End-to-end encrypted messaging for work

Keep It Private

Big Brother is watching Slack. Clamshell is end-to-end encrypted and everyone at work is already on it.

Get the iOS app How it works Sign in with your work email · Your company's own homeserver · Nothing to configure

Connect with coworkers, off-the-record

State-of-the-art end-to-end encryption (powered by the open source Matrix protocol) keeps your conversations secure. We can't read your messages, and no one else can either. Privacy isn't optional — it's just the way that Clamshell works.

Every message, every file, every time.

  • Your company, your homeserverEach organization runs on its own Matrix homeserver, isolated from every other.
  • Work email, no passwordsSign in with a link to your work email. No phone numbers, no passwords to leak.
  • Gone when it should beMessage history is kept for a limited time and then removed from our servers.