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Threema. The Secure Messenger app for iPhone and iPad


4.6 ( 416 ratings )
Utilities Social Networking
Developer: Threema GmbH
5.99 USD
Current version: 6.1.2, last update: 3 months ago
First release : 28 Dec 2012
App size: 72.69 Mb

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

Pros and cons of Threema. The Secure Messenger app for iPhone and iPad

Threema. The Secure Messenger app good for

[EDIT] Notification alert sound bug disappeared with no reason. Anyhow, theres still that annoying location bug for as long as I can remember. When someone shares their location, the map is unstable. It is initially centered on the other partys location (green dot) as this is the intended purpose, but soon after it quickly moves to *our* location (blue dot), and we can no longer see the other persons location unless fiddling with the little icons on bottom part of the screen.
No glitches. Runs as smooth as iMessage but better since its fully secure. Youll never have to worry about your information and messages being intercepted with THREEMA! Great app! Worth every penny.
Ive been using Threema for about 5-months now. It definitely needs GIF support, but other than its an awesome way to send and receive encrypted messages free from prying eyes.
I love threema so much that I use it as my primary messaging app. Unfortunately, not everyone has it yet. A suggestion might be to implement an interface we can receive and respond to non threema text messages (similar to Facebook messengers recent update where we can respond to text messages from within the app!) that way we would not have to continue to switch between apps for conversations but i understand that that might compromise the security of the corporation because thats what threema is known for. Ill forever recommend this app to everyone looking for a secure messaging portal and I continue to look forward to your updates
The app works fine and has many pros. Its not tied to a phone number which is nice. Though Im unsure how much I can trust the app Im sure it is good enough for general texting and photo sharing. Pros: 1) Pin to open the app (optional) 2) Read receipt 3) Very customizable 4) you can see when someone is responding. 5) Group messaging Cons: 1) No audio calling (VoIP) 2) Open up the code for security audits by everyone Until number two happens, have Signal on your phone for calls and more private conversations.
Good app and seem like good devs behind it, but refusal to allow open source inspection of code makes me a little less comfortable. A competitor Signal is open source and researchers found a bug and it was quickly patched. All software has bugs and its sometimes hard for a dev team to catch all their own bugs. For all the very low ratings, understand this is not intended to compete with whatsapp or messenger. This is a serious app with a niche market and focus. The nature of it makes it inherently less convenient than those other mainstream apps.

Some bad moments

I didnt put in my email or any other self identifying information. Im trying to send to someone elses ID who did the same. It appears you cannot do this. Am I wrong? If not please fix this. My situation is even more secure without self identifying information. Without this scenario I dont see that this app is necessarily more secure than other apps. As part of my profession I do computer security as well Update: I tried to add my contact by the text ID and it keeps saying request timed out. It also times out trying to verify the photo of the ID using my iphone on iOS 10. My friends ipad worked when adding me as a contact however. Then I sent a msg to my phone and it never showed up after a day now. App seems to have a few issues. Im very disappointed out of the gate
App not connecting to internet on an iPhone 6S, running iOS 10.2, using T-Mobile. Please fix or send a solution.
App needs to be upgraded to allow: 1. Siri support to send Threema messages 2. Audio calling 3. Group audio calling 4. Video calling 5. Group video calling 6. Siri support to place calls 7. Answer audio calls right from the lock screen like standard phone calls 8. Ability to recall any sent message 9. Apple Watch support
After upgrading to 2.4.0, Threema doesnt work anymore. All my other apps work fine, so its not my phones fault. It seems to be bad coding and its a shame this happens to an app Ive been using for less than a year.
Need ios 9.0.2 update Sometimes notifications sound is close fixed this
After automatic!!! update it is not working. And now without any other communication channel, I,m glad to read, that I had too skip automatic !!! update

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