# Udan HESS vs S

Udan HESS and S are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 10, 2026 and May 22, 2026 respectively.

## The numbers

| Metric | Udan HESS | S |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Size | 33 MB | 59 MB |
| Requires iOS | 13.0 | **12.4** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Anhui Udan Technology Co., Ltd.](https://appshunter.io/developer/1593792520) | [Zhejiang Chisage New Energy Technology Co., Ltd](https://appshunter.io/developer/1748964853) |

## What reviewers say

### Udan HESS

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

**Features:** macOS Compatibility

**In-app purchases:** none


### S

[App page](https://appshunter.io/ios/app/s-boost/id6477367283)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Udan HESS free?

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

### Is S free?

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

### Do Udan HESS or S have ads?

Neither Udan HESS nor S shows ads.

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

Udan HESS ships an update every 3 months, and S every 3 months. Most recently, Udan HESS was updated on September 10, 2026 and S on May 22, 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.*