Comparison

Threema. The Secure Messenger vs SIN

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Threema. The Secure Messenger

This secure messenger prioritizes privacy with end-to-end encryption for all communications. It uses a unique ID instead of personal information, leaving no data trail and offering anonymous use. Enjoy private chats, calls, and file sharing without ads or trackers.

Highlights
  • End-to-end encrypted chats and calls
  • Anonymous use with Threema ID
  • File sharing in all formats
  • Edit and delete sent messages
  • Desktop app and web client
  • Group creation and polls
Features
Read full description

Threema is the world’s best-selling secure messenger, used by more than 12 million people in over 175 countries, developed in Switzerland, and designed with privacy and data protection in mind. Whether chats, calls, or files, everything is end-to-end encrypted, and no data trail is left behind. Instead of a phone number or email address, a randomly generated Threema ID serves as a unique identifier – anonymous and secure. Threema protects what really matters: your privacy. Advantages of Threema: • Text and voice messages, including emoji reactions • End-to-end encrypted voice, video, and group calls • Location sharing • Sending files in all formats (PDF, GIF, MP3, ZIP, and more) • Ability to edit sent messages and delete them for chat partners • Desktop app and web client for convenient chatting on your PC • Group creation and polls • Light or dark mode • No ads, no trackers, no data collection • Identity verification of contacts by scanning their QR code Reliable security: • Open source and regular audits • Servers in Switzerland • Anonymous use possible: no phone number or email address required • Messages are deleted from the server immediately after delivery Do you have any questions or problems? Our FAQ can help: https://threema.com/support Enjoy using Threema!

About

SIN

Features
Read full description

Une nouvelle application pour une communication plus fluide. Cette plateforme est conçue pour améliorer la collaboration entre les équipes en offrant un accès rapide et centralisé aux informations essentielles. Grâce à son interface intuitive, elle permet aux collaborateurs de rester connectés, informés et engagés au quotidien. Quelles fonctionnalités ? · Actualités : Recevez en temps réel les dernières informations et annonces de l’organisation. · Messagerie et notifications : Échangez facilement avec vos collègues et recevez des notifications en temps voulu. · Annuaire : Retrouvez facilement les contacts de vos collègues · Agenda et événements : Restez informé des réunions et événements Comment rejoindre l'application ? Cliquez sur "J'ai reçu un code" , si vous avez reçu un code par email. Cliquez sur "Demander à rejoindre SIN" si vous n'avez pas reçu de code par email. L'application est disponible en version WEB également : connectez vous depuis votre ordinateur. Rapprochez vous des personnes en charge du projet. Téléchargez-la dès maintenant et restez connecté où que vous soyez !

Screenshots

Threema. The Secure Messenger4 screens
SIN4 screens

Verdict

The call

The clearest difference is price: SIN at Free against Threema. The Secure Messenger's $6.99. SIN also leads on iOS requirement (15.0 vs 18.0). Threema. The Secure Messenger's advantage is update cadence (every 11 days vs every 6 weeks) and chart position (#1 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

SIN is free to download; Threema. The Secure Messenger costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Threema. The Secure Messenger ships an update every 11 days, SIN every 6 weeks. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 7 level
Threema. The Secure Messenger versus SIN: the parameters behind the verdict, then further details
ParameterThreema. The Secure MessengerSIN
Price$6.99Free — better
Rating4.2 (725 ratings) — better—
Positive reviews62.0% of reviews—
Number of ratings725 — better—
Update frequencyEvery 11 days — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#1 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.0 — better
Further details — not scored
Size119 MB68 MB
Age rating4+4+
DeveloperThreema GmbHILLIWAP

Bugs and requests

Threema. The Secure Messenger

Reported bugs

5 issues
  • Messages not sending or receiving
  • App freezing or crashing
  • Unreliable video/voice call functionality
  • Notification issues after updates
  • Data transfer problems when switching devices

Requested features

6 requests
  • Add auto-delete/expiring message option
  • Improve video/voice call reliability
  • Enhance notification system
  • Expand emoji/reaction options
  • Simplify data transfer to new devices
Show 1 more
  • Add iPad/desktop app support

SIN

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Threema. The Secure Messenger

No in-app purchases

None

SIN

No in-app purchases

Questions

Is Threema. The Secure Messenger free?
Threema. The Secure Messenger costs $6.99, with no in-app purchases.
Is SIN free?
SIN is free to download, with no in-app purchases.
Do Threema. The Secure Messenger or SIN have ads?
Neither Threema. The Secure Messenger nor SIN shows ads.
Which is updated more often, Threema. The Secure Messenger or SIN?
Threema. The Secure Messenger ships an update every 11 days, and SIN every 6 weeks. Most recently, Threema. The Secure Messenger was updated on November 1, 2026 and SIN on October 28, 2026.

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