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
• Edit and delete sent messages on the recipient’s end
• 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
• 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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Threema FAQ
Is Threema free?
Yes, Threema is completely free and it doesn't have any in-app purchases or subscriptions.
Is Threema legit?
🤔 The Threema app's quality is mixed. Some users are satisfied, while others report issues. Consider reading individual reviews for more context.
What happened??? This used to be a great little app but since the update, it’s just been completely frozen. I can open the app but that’s about it. When I tap on anything (chats, profile etc) nothing happens. I REALLY need to contact someone on this app asap but it won’t let me do anything 🤷🏼♀️
security is good, app is not so stable
i have been trying to access a very active group chat and every time i open the app i get more messages loading in, but can’t actually enter the chat. works fine if it does open, but as for now can’t access anything.
Storage management broken
I like the app but the storage management is broken. I’ve deleted all messages and media but the app still used a 4.64GB of storage for data. Please fix this.
Some suggestions
Absolutely love this app, using for years now. After latest update, time next to read icon is not when the message was read, but when it was sent, would be great to get it back as it was, so it’s clear when recipient actually saw message. The other thing is, would be good to have more options on reacting to message or media, not only “like” or “dislike”. Adding some emojis would do a big difference. Overall 10/10.
For the feeble
Threema is an unbearably poor messenger service that merely survives on the back of the reputation of its E2E quality and open source backend, but the truth is none of this matters if the actual app services are so incredibly poor. The servers are slow and lack capacity, and the encryption is not even close to what others can do, meaning a voice call will always require peak connection of both devices, meaning the app will probably only send 2 out of the 5 photos you want to send first try and also forget the caption, meaning don’t even think about a video call. Furthermore, the owners can probably not remember the last time they’ve invested in app features, meaning the app will not be remotely close to the messaging features (polling, questions, reactions, sharing locations, interactions with other apps) of competitor apps. Meaning the app will have issues with your Bluetooth devices and cause other synchronisation issues. Meaning it’s a sad excuse of a WhatsApp competitor and I could have gotten half a coffee for my money.
Great app - not great for iPhones
I love the encryption settings on Threema which is the main reason I've been using it alongside WhatsApp (difficult to get around) for years. But also for years it's not running well on my iPhones or those around me - it crashes and freezers frequently and stutters along quite often. It also doesn't allow for group video call on iPhones which is a shame. Hopefully and given the number of iPhone users out there this can be improved over time.
No burn messages = not safe
Simple as the title says. Without burn messages, only takes the pigs to grip you and you’re done for.
Baffles me how something so simple can’t be implemented!
App is useless without it
Calls don’t work much
Messaging is OK, probably secure, but calls get stuck at initialisation 80-90% of the time.
Features
Not bad but still lacks what are these days basic functions. Please add the ability to make admins on groups, and timed messages on chats! Features which both Signal and WhatsApp have and make total sense. Also more reactions than thumbs up and down for individual messages would be a nice to have. Keep up the great work!
Freezes on private chat
I like threema a lot and would give probably 5 stars but can’t as on private chat freezes then need to be completely restarted app. PLEASE FIX IT
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