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

4.19 out of 5

403 ratings in United States

5 star
265
4 star
49
3 star
28
2 star
23
1 star
38

Ratings History

Reviews

Delete button not working

deevicci on

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.

TF333444 on

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

Loloshi 31 on

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!!!

kisslandxo on

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

Bobgritzjr on

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

Truly blessed J on

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.

Need help

ViverosCJ on

I recently upgraded phone, and am not able to restore account on new phone, what can I do?

Notifications stopped!!!

wma229 on

Upgraded 5 days ago. One of the bugs that was supposed to be fixed was notifications. Not on my app. Now I get ABSOLUTELY NO notifications. I also don’t get chats unless I go into app and tap on contact. This app is useless now!!!

Stupid

Catlunchbox2303 on

I’m so upset. I purchased this so I could remain anonymous when texting and this is NOT it. You have to first invite the person with your actual number!! I paid five dollars for this stupid frickin app and I can’t even use it!!

Would be of been great

knjuyghnb on

This app still need more option in their messaging system. Disappearing time need to be added in for safety reason. You don’t want someone phone to fall in someone else hands and have all old message read. Very scary situation for user. Also id need to be hidden better. Everyone shouldn’t be able to see your personal id in group. If they fix these problem this app would of been great

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App Info

Publisher
Threema GmbH
Languages
Dutch, German, English, French, Italian, Japanese, Korean, Ukrainian, Polish, Portuguese, Romansh, Russian, Slovak, Spanish, gs, Chinese, Czech, Turkish
Recent version
6.1 (1 week ago )
Released on
Dec 28, 2012 (11 years ago )
Last updated
1 week ago