Threema. The Secure Messenger

Threema. The Secure Messenger

By Threema GmbH

  • Category: Social Networking
  • Release Date: 2012-12-28
  • Current Version: 6.1.1
  • Adult Rating: 4+
  • File Size: 72.68 MB
  • Developer: Threema GmbH
  • Compatibility: Requires iOS 15.0 or later.
Score: 4.19902
From 407 Ratings


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:



  • Good

    By Cugia69
    Good app and easy to use. Worth the little money. Highly recommended.
  • Solid app

    By Travkat1975
    Nice to have end to end privacy
  • Best and most secure

    By Gshubbar
    Can’t beat the quality and reliability and security of this app especially in todays world
  • Possibly more functions in the future?

    By Oneeyedbandit!
    The app itself is great. I love it and haven’t had any issues. , but I’m wondering if down the line more privacy features would be added. For instance, a function to not allow screenshots or maybe possibly disappearing text set by the user? It would be nice to have these features implemented.
  • Delete button not working

    By deevicci
    iPad - DELETE button is not working after “long hold” on the message & the options pop up. It works on iPhone. You have to “Select” & click the left circle to delete.
  • Use Signal instead.

    By TF333444
    Haven’t seen much good things added in terms of features or bugfixes in a looooong time. - sending media from Photos app requires you to wait for the media to be encoded before you can add captions. You need to keep the send dialogue open until everything is sent, otherwise you loose your captions and you have to share from pictures again - when sending multiple images/videos and one fails (eg network timeout), all media “after” that are lost and you have to share again from Photos app. - randomly people can’t receive/send messages for non-obvious reasons. No error messages whatsoever. We found out by accident when speaking IRL. Trusting the other’s Threema IDs resolved it - extremely limited set of reaction emojis. Why can’t I use the full emoji pallet to express my emotions - can’t port data backups from android to iOS??? - when you are offline for some time and get online again you are spammed by notifications, instead of Threema batching them in a single notification/one per chat Threema for Desktop is the only good addition that I’ve seen in 5+ years. I don’t see a reason to pay for Threema when there are better alternatives (Signal being the obvious one)
  • Question

    By Loloshi 31
    Is it possible to have the live location shared for infinite time? It is an option interesting. I would love to see it on an update. Thanks
  • One Of The Best!!!

    By kisslandxo
    All around and amazing app well put together love the security and privacy and you guys really did your work on this one. I recommend it to all my friends, my family and as many people as I can possible it’s that good of an app. Also I’m working on a app, would you guys be willing to donate any amount helps. After completion everyone that helped me out, will definitely be rewarded generously.
  • Long Delays

    By Bobgritzjr
    Whilst I appreciate the privacy, the delay in texting is really, really bad. Knowing that I and my contact have a good WiFi connection on both ends and messages still take 5 or more minutes to be delivered is unacceptable. For a paid app, long delays on perfectly good WiFi connections should be nonexistent.
  • Threema secure app

    By Truly blessed J
    I like this secure app. It has many features and the customer service dept. is very quick to respond and help. I recommend this for anyone needed in a truly secure messaging, texting, etc. app.