# Threema OnPrem vs HotZone

The clearest difference is in-app purchases: Threema OnPrem at none against HotZone's 2. Threema OnPrem also leads on update cadence (every 10 days vs every 3 weeks). HotZone's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. HotZone sells 2 one-off in-app purchases. Threema OnPrem asks for nothing beyond the download.

Threema OnPrem ships an update every 10 days, HotZone every 3 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Threema OnPrem | HotZone |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/threema-onprem/id1348687756/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 112 MB | 19 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Threema GmbH](https://appshunter.io/developer/535112011) | [Marijan Frey](https://appshunter.io/developer/6774814861) |

## 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. The platform ensures confidentiality for sensitive government and industrial communications.

**Highlights:** Self-hosted for complete data sovereignty, End-to-end encrypted communication, Secure voice and video calls, Confidential team, group, and project chats, Secure file and document exchange, Cross-platform use (mobile, desktop, web)

**Features:** Apple Wallet

**In-app purchases:** none


### HotZone

[App page](https://appshunter.io/ios/app/hotzone/id6774814859)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Boost | $2.99 | one-time |
| HotZone Night Pass | $3.99 | one-time |


## Frequently asked questions

### Is Threema OnPrem free?

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

### Is HotZone free?

HotZone is free to download, with in-app purchases available.

### Do Threema OnPrem or HotZone have ads?

Neither Threema OnPrem nor HotZone shows ads.

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

Threema OnPrem ships an update every 10 days, and HotZone every 3 weeks. Most recently, Threema OnPrem was updated on November 6, 2026 and HotZone on November 5, 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.*