# Retail Tech Management System vs Water Purifier Diary

The clearest difference is in-app purchases: Retail Tech Management System at none against Water Purifier Diary's 2. Retail Tech Management System also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Water Purifier Diary sells 2 in-app purchases, starting at $0.99 per month. Retail Tech Management System asks for nothing beyond the download.

Retail Tech Management System ships an update every 5 weeks, Water Purifier Diary every 3 weeks. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Retail Tech Management System | Water Purifier Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Size | 38 MB | 41 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Retail Tech Pte. Ltd.](https://appshunter.io/developer/1766465858) | [HAO CHANG KUO](https://appshunter.io/developer/1735524069) |

## What reviewers say

### Retail Tech Management System

[App page](https://appshunter.io/ios/app/retail-tech-management-system/id6642697975)

**Features:** macOS Compatibility

**In-app purchases:** none


### Water Purifier Diary

[App page](https://appshunter.io/ios/app/water-purifier-diary/id6761051602)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $0.99 | per month |
| Pro (Yearly) | $8.99 | per year |


## Frequently asked questions

### Is Retail Tech Management System free?

Retail Tech Management System is free to download, with no in-app purchases.

### Is Water Purifier Diary free?

Water Purifier Diary is free to download, with in-app purchases available.

### Do Retail Tech Management System or Water Purifier Diary have ads?

Water Purifier Diary shows ads; Retail Tech Management System does not.

### Which is updated more often, Retail Tech Management System or Water Purifier Diary?

Retail Tech Management System ships an update every 5 weeks, and Water Purifier Diary every 3 weeks. Most recently, Retail Tech Management System was updated on October 10, 2026 and Water Purifier Diary on October 7, 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.*