# Threema OnPrem vs Mailcot

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.

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.

## The numbers

| Metric | Threema OnPrem | Mailcot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/threema-onprem/id1348687756/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/mailcot/id6720758773/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 5 days** |
| Monetization | Free | Free |
| Size | 111 MB | 173 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Threema GmbH](https://appshunter.io/developer/535112011) | [Northern Atlantic Group LLC](https://appshunter.io/developer/1681275819) |

## What reviewers say

### Threema OnPrem

[App page](https://appshunter.io/ios/app/threema-onprem/id1348687756)

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.

**Highlights:** Self-hosted solution, Complete data sovereignty, End-to-end encrypted calls, Secure file sharing, Cross-platform compatibility, PIN/fingerprint chat protection

**Features:** Apple Wallet

**In-app purchases:** none


### Mailcot

[App page](https://appshunter.io/ios/app/mailcot/id6720758773)

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.

**Highlights:** Share posts and updates, Connect with professionals, Exchange industry insights, Foster collaboration, Facilitate networking, Stay updated on trends

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Threema OnPrem free?

Threema OnPrem is free to download, with no in-app purchases.

### Is Mailcot free?

Mailcot is free to download, with no in-app purchases.

### Which has better reviews, Threema OnPrem or Mailcot?

Threema OnPrem and Mailcot are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do Threema OnPrem or Mailcot have ads?

Neither Threema OnPrem nor Mailcot shows ads.

### Which is updated more often, Threema OnPrem or Mailcot?

Threema OnPrem ships an update every 10 days, and Mailcot every 5 days. Most recently, Threema OnPrem was updated on October 12, 2026 and Mailcot on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*