# zTMS vs WANJIN ESS

The clearest difference is update cadence: zTMS at monthly against WANJIN ESS's every 6 months. WANJIN ESS's advantage is iOS requirement (12.0 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.

zTMS ships an update monthly, WANJIN ESS every 6 months. The most recent releases landed on September 10, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | zTMS | WANJIN ESS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 months |
| Size | 33 MB | 24 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen ZKS Mobile IOT Tech Co., Ltd.](https://appshunter.io/developer/1296855170) | [Anhui Udan Technology Co., Ltd.](https://appshunter.io/developer/1593792520) |

## What reviewers say

### zTMS

[App page](https://appshunter.io/ios/app/ztms/id1343042775)

**In-app purchases:** none


### WANJIN ESS

[App page](https://appshunter.io/ios/app/wanjin-ess/id6478657145)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is zTMS free?

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

### Is WANJIN ESS free?

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

### Do zTMS or WANJIN ESS have ads?

Neither zTMS nor WANJIN ESS shows ads.

### Which is updated more often, zTMS or WANJIN ESS?

zTMS ships an update monthly, and WANJIN ESS every 6 months. Most recently, zTMS was updated on September 10, 2026 and WANJIN ESS on September 18, 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.*