Privacy Checkup: Find out how to improve your online privacy

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My privacy. My messenger.

Do you see me in this picture? 😉


🎉 Hey, I’m in Zurich too!
Let’s get together!


Hanna Schmidt

🎉 Hey, I’m in Zurich too! Let’s get together!

Ok! How about tomorrow for coffee around 9?


A Statement
for Privacy

Versatile Features
Trusted by Millions

Full Anonymity
No Data Collection

Security and Privacy by Design

Threema is the messenger with rigorous data protection and rock-solid security. The chat app was developed with “Privacy by Design” as the guiding principle.

Guaranteed Privacy,
Strong Encryption

Threema is the instant messenger designed to generate as little user data as possible. All communication is always end-to-end encrypted.

Chat Anonymously:
No Phone Number Required

When setting up the chat app, each user generates a random Threema ID. Linking a phone number or email address is optional.

Find out here why anonymity is important even if you only chat with friends you know personally.

No Collection of User Data,
No Ads

Free online services are often financed by using user data for advertising. For example, WhatsApp collects metadata, which isn’t compatible with privacy protection. Threema is financed by the price of the app and does not collect user data.

Hide Private Chats
and Protect Them With a Passcode

Hide particularly sensitive chats, and lock them with a PIN or biometric data.

End-to-End Encrypted
Voice, Video, and Group Calls
Video call via Threema messenger on an Android smartphone

Place calls without revealing your phone number. Threema calls are end-to-end encrypted and thus tap-proof. They impress with crystal-clear voice quality and brilliant video quality.

100% Swiss Made
and GDPR-Compliant

Threema is a true Swiss company hosting its own servers in Switzerland.** From software development to customer support, everything is done in-house. The instant-messaging service is fully GDPR-compliant.

Open Source
and Regular Security Audits

To ensure full transparency, the Threema apps are open source. Threema’s algorithms and design decisions are documented in the Cryptography Whitepaper, and external experts are commissioned to conduct comprehensive security audits on a regular basis.

State-of-the-Art Chat App

Chat overview in the mobile iOS version of the secure messenger Threema
Group chat in Threema’s Android app
Chat history in Threema’s iOS app
User profile with contact details in Threema’s Android app
Poll via Threema on an iPhone
Video call via Threema messenger on an Android smartphone

Download Threema Now

Pay once, chat forever.*

Threema on the Smartphone


Threema on the Computer

Your Private Life Is Valuable
Don’t Pay With Your Data

There is no such thing as a free lunch. If you don’t pay money for a messenger service, you pay with your data instead.

Threema Work
The Secure Business Messenger

Don’t compromise on security. Protect your business chats and the privacy of your employees and business partners.

Candid Camera
Ice Cream in Exchange for Your Data

How old are you? What’s your phone number? … We used a candid camera to test how much personal information is shared for a free ice cream. The result is entertaining.

A Decade of Seriously Secure Messaging

Ten years ago, on 12/12/2012, the first ever Threema version was published in Apple’s App Store.

Threema Work
Protect Your Business Chats

Never be lulled into a false sense of security. Only a truly secure communication channel protects information from falling into the wrong hands.

Success Story
Swiss Alpine Rescue (SAR)

With Threema Work, Swiss Alpine Rescue has made a quantum leap in mission communication.

Success Story
Hardtschule Durmersheim

Threema Work has become the central communication tool for students and teachers.

Messenger Comparison

Popular chat apps like WhatsApp, Signal, Telegram, and Threema differ considerably in certain respects. Find out how they stack up against each other in our comprehensive messenger comparison. Here’s an overview of the most important differences:






Privacy by Design: No phone number or email address required

End-to-end encryption of transmitted messages

Open source

GDPR compliance

Corporate solution available

Transparency report


App users
Donation / Brian Acton
Pavel Durov / subscriptions / advertising



Stay in the Loop

E2E encrypted 🤝 Beta of Threema 2.0
group calls for desktop

17.07.2024, 14:23

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The Threema Channel allows you to subscribe to newsfeeds on Threema-related topics directly in the Threema app.

Threema Work

The ideal chat app for business purposes.