The messenger that puts security and privacy first.

Pay once, chat forever.*
No collection of user data. Open Source.

Threema – Secure messenger with versatile features and no data collection
Threema – Encrypted messenger for Android and iOS

Guaranteed Privacy, Strong Encryption, Open Source

Threema is the instant messenger designed to generate as little user data as possible. All communication is end-to-end encrypted, and the messaging app is open source.

Chat Anonymously: No Phone Number Required

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

No Collection of User Data, No Ads

Services that are financed by advertising collect user data in order to target their ads. Threema is not financed by advertising and does not collect user data.

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.

Threema Work

The ideal chat app for business.
Learn more Free trial

30 days, 30 users. No automatic renewal. No payment details required.

Privacy Is Worth Paying For

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

A Decade of Seriously Secure Messaging

Threema: Your private life is valuable. Don’t pay with your data

Candid Camera: Ice Cream in Exchange for Your Data

Threema Work: Protect your business chats

Success Story Hardtschule Durmersheim

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Some Key Differences Between Popular Chat Apps

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Privacy by Design: No phone number or email address required

End-to-end encryption of transmitted messages

Open source

GDPR compliance

Corporate solution available


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



Each chat tells its own story. iOS users can now highlight the variety of their conversations with individual chat wallpapers. 💬🖼️✨

09:06 · 01.06.2023

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