# Sermatec vs Udan HESS

The clearest difference is update cadence: Sermatec at every 3 weeks against Udan HESS's every 3 months. Udan HESS's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sermatec ships an update every 3 weeks, Udan HESS every 3 months. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Sermatec | Udan HESS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 62 MB | 33 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Sermatec Energy Technology CO.,LTD](https://appshunter.io/developer/1503982937) | [Anhui Udan Technology Co., Ltd.](https://appshunter.io/developer/1593792520) |

## What reviewers say

### Sermatec

[App page](https://appshunter.io/ios/app/sermatec/id1503982938)

Monitor the status of integrated optical storage machines and view overall power station performance. Access real-time data charts, predict power generation efficiency, and manage historical alarms. Supports multiple power station and device management with online configuration and multi-account login.

**Highlights:** View overall power station status, Real-time data status charts, Equipment power generation efficiency prediction, Historical alarm monitoring, Multiple power station management, Online configuration

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

**In-app purchases:** none


### Udan HESS

[App page](https://appshunter.io/ios/app/udan-hess/id6443758347)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sermatec free?

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

### Is Udan HESS free?

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

### Do Sermatec or Udan HESS have ads?

Neither Sermatec nor Udan HESS shows ads.

### Which is updated more often, Sermatec or Udan HESS?

Sermatec ships an update every 3 weeks, and Udan HESS every 3 months. Most recently, Sermatec was updated on September 23, 2026 and Udan HESS on September 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.*