In recent years, the concern over data privacy has reached new heights. With increasing surveillance, cyber attacks, and data breaches, people are becoming more cautious about their digital footprints. This has led to the rise of privacy-centric messaging apps like Threema and Signal.
Updated October 2026. We corrected outdated claims about Threema (its apps have been open source since December 2020, and it relies on central servers), removed an unsourced growth statistic, and added details on sign-up, pricing and platforms from each app’s official pages.
Signal saw a spike in downloads in January 2021, after WhatsApp alerted users to a privacy policy update about sharing data with its parent company, Facebook (now Meta), and briefly topped the free app charts in several countries. Since then, Signal and Threema have remained strong contenders in the privacy-driven messaging market.
Threema vs Signal – Feature-wise comparison
Encryption Quality
Both Threema and Signal use end-to-end encryption to protect user messages from prying eyes. However, Signal’s encryption protocol is considered to be the gold standard in the industry, as it is open-source and has been independently audited by security experts.
Threema’s encryption is also strong. Encryption and decryption happen directly on the device, so not even the server operators can read message content. Threema’s apps have been open source (under the AGPLv3 licence) since December 20, 2020, and the company says it commissions external experts to conduct security audits on a regular basis. Reproducible builds, which let you check that the published code matches the app you download, are currently available for the Android app.
User Experience
When it comes to user experience, Signal’s interface is clean and minimalist, making it easy to use.
Threema, on the other hand, has a slightly more complex interface, with a range of customization options that allow users to adjust the app’s appearance to their liking. However, this customization comes at the cost of simplicity, and some users may find Threema’s interface overwhelming.
Servers, Sign-up and Data Storage
Signal is a centralized messaging app: messages pass through Signal’s servers, but they are end-to-end encrypted and Signal keeps very little data about its users. According to Signal, the only information it can produce in response to a subpoena is the date and time a user registered and the last date the user connected to the service. Signal still requires a phone number to sign up, but since February 2024 you can create a username and hide your phone number from other people.
Threema is not decentralized either; it also relays messages through its own servers. Its privacy advantage lies in how little it asks for: no phone number or email address is required, because each user gets a random Threema ID. Threema says messages are deleted from its servers immediately after delivery, the app can be used fully without access to your address book, and group memberships remain on your devices. This makes Threema more private by design, but it also means users are responsible for keeping their own data secure and backups.
Also Read – Datadog vs. Splunk – Which Is Better for Infrastructure Monitoring?
Pricing
Signal is free to download and use. Threema is a paid app: as of October 2026, Threema’s pricing page lists the private version as a one-time purchase of 6.00 (CHF, EUR or USD), with the exact price depending on the app store and country. Threema also offers separate business versions.
Cross-Platform Support
Both Threema and Signal are available on multiple platforms, including iOS, Android, and desktop.
Signal offers apps for Android, iPhone and iPad, plus desktop apps for Windows, macOS and Linux. To use Signal on a desktop, you must first install it on your phone.
Other Features
In terms of additional features, both Threema and Signal offer a range of options to enhance user privacy.
For example, Signal lets users set disappearing messages so that messages automatically delete after a set period of time.
On some Android devices, Signal also offers an “Incognito Keyboard” option, which asks your keyboard app not to learn from what you type in Signal. Keyboards can ignore this request, so it is a best-effort setting rather than a guarantee.
Conclusion
When it comes to Threema vs Signal, both apps are strong contenders in the privacy-driven messaging market. Signal is free, its open-source encryption protocol is widely regarded as the industry’s gold standard, and its minimalist interface makes it easy to use.
Threema costs a small one-time fee, but it offers open-source apps, a range of customization options and sign-up without a phone number, which makes it attractive if you want to stay anonymous. Ultimately, the choice between Threema and Signal comes down to personal preference, and users should evaluate each app’s features and design to determine which one best meets their needs.
Sources
- Threema: In Celebration of Becoming Open Source, Threema Is 50% Off
- Threema: Open Source
- Threema: Privacy
- Threema: What makes Threema secure?
- Threema: Pricing
- Signal: Government Communication
- Signal: Keep your phone number private with Signal usernames
- Signal: Download
- Signal Support: Incognito Keyboard
- Campaign Middle East: WhatsApp users flock to Signal and Telegram in light of privacy concerns
