Threema encrypts all your communications including group chats and media using state of the art end-to-end encryption technology. Strong asymmetric cryptography ensures thats only the intended recipient can read your messages.
Versatile and Feature-rich
Threema makes secure communications easy and fun. You can send photos, videos, voice messages, QR codes and even group polls.
Threema stores as little information as possible on a centralized server infrastructure. Group memberships and contact lists are managed on end user devices only. Messages are immediately deleted after they have been delivered to the recipient. This effectively prevents the collection of meta data.
Unique Poll Feature
The integrated poll feature in Threema makes decisions easy. Easily poll your friends on anything in just a few simple steps and get immediate results.
Verify your contacts simply by scanning their QR code or comparing key fingerprints. This makes sure you're really talking to the intended person and not a man-in-the middle.
Each Threema user receives a random Threema ID for identification. A phone number or email address is not required to use Threema. This unique feature allows you to use Threema completely anonymously.
Open Message API
Threema Gateway allows you to encrypt, send, receive and decrypt messages directly in your own applications. Threema's Message API supports end-to-end encryption right from the source to the recipient. The software is freely available with an open source license.
Threema is a 100% independent and self-financed company in the heart of Switzerland with its own servers and in-house software development. There are no investors with expectations and no government grants.