Threema OnPrem vs Mailcot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Threema OnPrem
This secure messaging solution offers organizations complete data sovereignty by hosting on their own servers. It provides end-to-end encrypted communication for teams, including voice and video calls, and secure file sharing, all protected by PIN or fingerprint.
- Self-hosted solution
- Complete data sovereignty
- End-to-end encrypted calls
- Secure file sharing
- Cross-platform compatibility
- PIN/fingerprint chat protection
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Threema OnPrem is the self-hosted communication solution for organizations with the highest security requirements. The combination of Threema’s proven security architecture and complete data sovereignty creates an independent communication environment that is unmatched in terms of confidentiality – ideal for government agencies, police forces, and industrial companies. Advantages of Threema OnPrem: • 100% data sovereignty through hosting on your own servers • Proven Threema security architecture • Confidential communication in teams, groups, and projects • End-to-end encrypted voice and video calls • Secure exchange of files and documents in all formats • Cross-platform use thanks to mobile app, desktop app, and web client • Additional protection of confidential chats with PIN or fingerprint NOTE: Before you can use this app, Threema OnPrem must be set up on your company server. For more information, visit threema.com/onprem. Enjoy using Threema OnPrem!
Mailcot
Connect with professionals and companies to share posts, updates, and industry insights. This business community app fosters collaboration, networking, and knowledge sharing to help users grow and engage with relevant audiences.
- Share posts and updates
- Connect with professionals
- Exchange industry insights
- Foster collaboration
- Facilitate networking
- Stay updated on trends
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Mailcot is a business community app designed for sharing posts, updates, and insights. It allows professionals and companies to connect, exchange ideas, and stay updated with industry trends. The platform fosters collaboration, networking, and knowledge sharing within the business community, making it easier to grow and engage with relevant audiences.
Screenshots
Verdict
Threema OnPrem and Mailcot both sit at 5.0 stars, but that hides the real split: 100% of Mailcot's written reviews are positive against 0% of Threema OnPrem's. Mailcot also leads on iOS requirement (13.0 vs 17.0). On price, rating, ratings volume and update cadence 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Threema OnPrem against 5.0 for Mailcot. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews are what separate them: 0% of Threema OnPrem's written reviews are positive against 100% of Mailcot's.
Threema OnPrem ships an update every 10 days, Mailcot every 5 days. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.
| Parameter | Threema OnPrem | Mailcot |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 2 |
| Update frequency | Every 10 days | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 111 MB | 173 MB |
| Age rating | 4+ | 17+ |
| Developer | Threema GmbH | Northern Atlantic Group LLC |
Customer experience
Threema OnPrem
Mailcot
In-app purchases
Threema OnPrem
No in-app purchases
Mailcot
No in-app purchases
