# Water Balance Control vs 81Auto

The clearest difference is in-app purchases: 81Auto at none against Water Balance Control's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Water Balance Control sells 1 one-off in-app purchase. 81Auto asks for nothing beyond the download.

Water Balance Control ships an update weekly, 81Auto every 5 days. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Water Balance Control | 81Auto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/81auto/id6758384077/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | — | Free |
| Size | 12 MB | 33 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Dmitriy Karabetskiy](https://appshunter.io/developer/1524615786) | [南京海荣通科技有限公司](https://appshunter.io/developer/1855098968) |

## What reviewers say

### Water Balance Control

[App page](https://appshunter.io/ios/app/water-balance-control/id1585953220)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $5.99 | one-time |


### 81Auto

[App page](https://appshunter.io/ios/app/81auto/id6758384077)

This platform facilitates international automotive trade by digitally connecting China's car supply chains with global demand. It uses big data and AI for intelligent vehicle matching, helping overseas buyers find suitable vehicles efficiently and affordably.

**Highlights:** Cross-border automotive trade, Digitalized supply chain connection, Intelligent vehicle matching, Big data and AI technology, Global market demand integration

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

**In-app purchases:** none


## Frequently asked questions

### Is Water Balance Control free?

Water Balance Control is free to download, with in-app purchases available.

### Is 81Auto free?

81Auto is free to download, with no in-app purchases.

### Do Water Balance Control or 81Auto have ads?

Neither Water Balance Control nor 81Auto shows ads.

### Which is updated more often, Water Balance Control or 81Auto?

Water Balance Control ships an update weekly, and 81Auto every 5 days. Most recently, Water Balance Control was updated on November 7, 2026 and 81Auto on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*