Threema. The Secure Messenger
Secure. Anonymous. Private.
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Description

Threema is the world’s best-selling secure messenger and keeps your data out of the hands of hackers, corporations, and governments. The service can be used completely anonymously. Threema is open source and offers every feature one would expect from a state-of-the-art instant messenger. The app also allows to make end-to-end encrypted voice, video and group calls. Using the desktop app and the web client, you can also use Threema from your desktop.

PRIVACY AND ANONYMITY
Threema is designed from the ground up to generate as little data on servers as possible. Group memberships and contact lists are managed on your device only, and never stored on our servers. Messages are immediately deleted after they have been delivered. Local files are stored encrypted on your mobile phone or tablet. All this effectively prevents the collection and misuse of your personal information, including metadata. Threema is fully compliant with the European privacy legislation (GDPR).

ROCK-SOLID ENCRYPTION
Threema end-to-end encrypts all your communication, including messages, voice and video calls, group chats, files, and even status messages. Only the intended recipient, and nobody else, can read your messages. Threema uses the trusted open source NaCl cryptography library for encryption. The encryption keys are generated and safely stored on the users’ devices to prevent backdoor access or copies.

COMPREHENSIVE FEATURES
Threema is not only an encrypted and private messenger but also versatile and feature-rich.

• Write text and send voice messages
• Make voice, video and group calls
• Share videos, pictures and locations
• Send any type of file (pdf, animated gif, mp3, doc, zip, etc.)
• Use the desktop app or the web client to chat from your computer
• Create groups
• Conduct polls with the poll feature
• Choose between a dark and a light theme
• Quickly and silently reply with the unique agree/disagree feature
• Verify the identity of a contact by scanning their personal QR code
• Use Threema as anonymous instant messaging tool
• Synchronize your contacts (optional)

SERVERS IN SWITZERLAND
All our servers are located in Switzerland, and we develop our software in-house.

FULL ANONYMITY
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 – no need to give up private information or to open an account.

OPEN SOURCE AND AUDITS
The source code of the Threema app is open for everyone to review. On top of that, renowned experts are regularly commissioned to conduct systematic security audits of Threema’s code.

NO ADS, NO TRACKERS
Threema is not financed by advertising and does not collect user data.

SUPPORT / CONTACT
For questions or problems please consult our FAQs: https://threema.ch/en/faq
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User Rating

4 out of 5

22 ratings in Belgium

5 star
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Ratings History

Reviews

It bugs…

BBB-333 on

Outgoing messages are stalling and don’t get sent away. Incoming messages I don’t get either despite the fact that I get a push notification of them. So when I delete the app and re-install with Threema Safe (user-ID and password) au get my incoming messages. Tho my outgoing stall again. Very annoying. Please help me out.

Application TOP

belarbima on

J’utilise depuis 1 année l’application c’est top, j’aurais aimé qu’on puisse utiliser mon propre serveur que j’héberge par exemple sur mon vps ou sur nas Aussi j’aurais bien aimé avoir la possibilité de faire un appel video direct sans devoir passer par appel audio puis video Merci bon courage les devs

Great App but...

Jopone on

... is missing still some major features the competition (Signal, WhatsApp..)already have for some time.🔺 Like automatically deleting particular messages to specific people. (After say 1 week, day, hour etc.)🔺 Also, synchronising with other devices for instance iPad, MacBook is a cumbersome procedure. Is there hope!? 🔺PS: in response to the developers input: security isn’t the main aim. It’s simply avoiding the amount of messages piling up. Automatically deleting them helps! 🔺Also when one has to reinstall the App (as happened to me recently) it’s a painstaking process. Thanks for your attention and reply! (08/09/2023)

Ne fonctionne plus vraiment bien

Rotulll on

J’utilise cette application depuis un certain temps et depuis quelques mois, j’ai de gros problèmes lors de mes tentatives d’appels, qui fonctionnent une fois sur dix. Et pourtant les iphone sont à jour, même l’un à côté de l’autre, l’appel ne fonctionne pas. Surtout pour les appels de la Belgique vers la Suisse. Bref, petit à petit je ne l’utilise plus, c’est dommage.

Application Top

belarbima on

Depuis 6 mois j’utilise Threema et je suis très content, il manque quelques fonctionnalités comme les réactions avec des emojis (rire pleurer triste etc ) Merci

Great App but...

Jopone on

... is missing some features the competition (Signal, WhatsApp..)already has for some time. Like automatically deleting particular messages to specific people. (After say 1 week, day, hour etc.) Also, synchronising with other devices for instance iPad, MacBook is a cumbersome procedure. Is there hope!? PS: in response on the developers input: security isn’t the main aim. It’s simply avoiding the amount of messages piling up. Automatically deleting them helps! Thanks for your attention and reply! (08/07/2021)

Couteau suisse en communication

looig on

Pour qui se méfie de Facebook et al.

Not possible

Mic129 on

Several Ids...non synchronisation... I erased it quickly....awful app?

The best private messaging app

Pihrra on

I've been using this app for a long time and I'm quite pleased with it. It offers strong (verifiable) security and is simple enough to use that I was able to convince most of the people I want to communicate with on a regular basis to switch to it. I highly recommend it.

chat setting

Rustam82 on

On iOs you can't see the time for each message

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App Info

Publisher
Threema GmbH
Languages
Portuguese, German, Czech, Chinese, Korean, Slovak, Spanish, French, Dutch, English, Italian, Japanese, Polish, Romansh, Russian, gs, Turkish, Ukrainian
Recent version
6.1.2 (1 week ago )
Released on
Dec 28, 2012 (11 years ago )
Last updated
1 month ago