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

4.49 out of 5

106 ratings in Czechia

5 star
82
4 star
10
3 star
4
2 star
4
1 star
6

Ratings History

Reviews

Od desiti k peti

Punish3r! on

Pri kazde prilezitosti pada, pri odpovedi pres Apple Watch se tvari ze zpravu odeslal, ale po otevreni appky na iphonu radsi pada, nemaze zpravy - tvari se ze maze, ale misto toho radsi pada. Reinstall nepomohl. Fakt uz me to nebavi. Po letech zvazuji switchnuti ke konkurenci

Self destruction messages

Peter Gaborik on

Why is it so hard to add self-destruction messages?

Great work, developers, big recommendation, users!

Xagash von Thronstahl on

As long as you teach the opposite side of conversation to delete the history, it is totally safe, I think 😂 And one big thumb up for possibility to skip the part in registration where you are supposed to enter your phone number, while you still can use it synced with your contacts and see the others who have the phone number entered (or possibly them at least) 😈

Nice

Pavkad on

Very good app for data security, still lacks an app for PC under IOS so that the phone doesn't have to be unlocked which is a security risk and ruins the whole app

Worse

Blend67 on

there is nothing worse than Threema

Excelentní

tesajan on

Vše super ale nejdou posílat zprávy sám sobě 😉

Aplikace/MacOS

Pavkad on

Chtělo by to přidat možnost v nastavení aby nemusel být stále telefon zapnutý. Takhle bych si akorat ničil telefon když jsem doma a rád bych používal jen aplikaci na PC

Self destruction

Peter Gaborik on

Loool the best secure message app, without self-destruction messages. Really?

Terrible

Kl.Š. on

After new update is app tottaly not stable. It's much more often closed because of nothing. Calls are not possible to hidden. Calling is sometimes not possible. I hear the second one but don't see the call. So I can't end the call,I can't use the camera...nothing. One big mess. I use Threema for many years,it's one of my favourite but now I'm tottaly disappointed. I hope that some new update will be sooner than in months and that it will help. Because now it's really bad.

Just miss Apple Watch app

Punish3r! on

Love this app. Will be great to have Apple Watch app as well

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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
6 days ago