# 第四记 vs 水经微图

The clearest difference is in-app purchases: 第四记 at none against 水经微图's 6. 第四记 also leads on update cadence (fortnightly vs every 5 weeks) and iOS requirement (13.0 vs 15.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. 水经微图 sells 6 one-off in-app purchases. 第四记 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for 第四记 against 5.0 for 水经微图. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

第四记 ships an update fortnightly, 水经微图 every 5 weeks. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 第四记 | 水经微图 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/id1571845119/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/id6474643703/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free | — |
| Size | 135 MB | 303 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GeoQuater Digital Earth (Beijing) Technology Co., Ltd.](https://appshunter.io/developer/1571845121) | [成都水经注信息科技有限公司](https://appshunter.io/developer/1677890114) |

## What reviewers say

### 第四记

[App page](https://appshunter.io/ios/app/id1571845119)

This app is a field recording companion for outdoor workers, focusing on efficiency and data quality. It offers various map layers, easy point, line, and area recording, and essential field tools like distance measurement and a compass.

**Highlights:** Multiple map layers, Point, line, and area recording, Field measurement tools, Customizable field forms, Multi-device data synchronization, Track recording, Data import/export

**Features:** macOS Compatibility

**In-app purchases:** none


### 水经微图

[App page](https://appshunter.io/ios/app/id6474643703)

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月微图VIP会员 | $2.99 | one-time |
| 1个月微图SVIP会员 | $4.99 | one-time |
| 3个月微图VIP会员 | $4.99 | one-time |
| 3个月微图SVIP会员 | $14.99 | one-time |
| 12个月微图VIP会员 | $14.99 | one-time |
| 12个月微图SVIP会员 | $29.99 | one-time |


## Frequently asked questions

### Is 第四记 free?

第四记 is free to download, with no in-app purchases.

### Is 水经微图 free?

水经微图 is free to download, with in-app purchases available.

### Which has better reviews, 第四记 or 水经微图?

第四记 and 水经微图 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do 第四记 or 水经微图 have ads?

Neither 第四记 nor 水经微图 shows ads.

### Which is updated more often, 第四记 or 水经微图?

第四记 ships an update fortnightly, and 水经微图 every 5 weeks. Most recently, 第四记 was updated on October 2, 2026 and 水经微图 on October 5, 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.*