Privacy that fits in your pocket

Use anything by Open Whisper Systems.

Edward Snowden, Whistleblower and privacy advocate

After reading the code, I literally discovered a line of drool running down my face. It’s really nice.

Matt Green, Cryptographer, Johns Hopkins University

Private messaging

For iPhone and Android

  • Say Anything - Send high-quality group, text, picture, and video messages, all without SMS and MMS fees.
  • Be Yourself - Use your existing phone number and address book. There are no separate logins, usernames, passwords, or PINs to manage or lose.
  • Stay Private - We cannot read your messages, and no one else can either. Everything is always end-to-end encrypted and painstakingly engineered in order to keep your communication safe.
  • Get Organized - Archive functionality makes it easy to keep track of the conversations that matter to you right now.
  • Pay Nothing - The development team is supported by community donations and grants. There are no advertisements, and it doesn't cost anything to use.
iPhone app on App Store Android app on Google Play

Private calling

For iPhone and Android

  • Speak Freely - Make crystal-clear phone calls to people who live across town, or across the ocean, with no long-distance charges.
  • Stay Private - We cannot hear your conversations, and no one else can either. No exceptions.
  • Pay Nothing - The development team is supported by community donations and grants. There are no advertisements, and it doesn't cost anything to use.
iPhone app on App Store Android app on Google Play

The Open Whisper Systems Team

Making private communciation simple.

Moxie Marlinspike

Moxie works on the protocols, the Android clients, and the server software. He has been contributing to Open Whisper Systems since it was Whisper Systems, formerly ran the product security team at Twitter, started the first cloud-based password cracking service, and has published a number of attacks on secure protocols like SSL and MS-CHAPv2.

Tyler Reinhard

Tyler oversees brand development and design, and works directly on Signal for iOS and the browser. If he's not complaining about the weather, he's usually advocating on behalf of our users. He is also the founder of Mask Magazine, a youth culture + style magazine.

Lilia Kai

Lilia develops the browser extension and maintains the website. She comes to Open Whisper Systems from the EFF, where she built online advocacy tools for activists fighting for a better internet. In her spare time she practices yoyo tricks and DIY home automation. She also serves as chief of sticker operations.

Frederic Jacobs

Frederic leads the iOS development. He daylights at the Swiss Institute of Technology (EPFL) and plays around with cryptography, censorship resistance and blockchains.

Jake McGinty

Jake works hard to keep the Android client bug-free and lookin good. His many titles include MMS expert, usability enthusiast, circuit lecturer, and mohawk afficionado. In his freetime he hacks hardware, spins diabolos, and rides motorcycles.

Rhodey Orbits

Rhodey works on the Android client. He has a satellite in orbit, and dreams of one day reclaiming the @rhodey handle on Twitter.

Open Whisper Systems is both a large community of volunteer Open Source contributors, as well as a small team of dedicated grant-funded developers. Together, we're working to advance the state of the art for secure communication, while simultaneously making it easy for everyone to use.