# 毛毛虫 vs Baby Tracker

The clearest difference is update cadence: Baby Tracker at every 5 days against 毛毛虫's monthly. 毛毛虫's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17). On price, ads and in-app purchases there is nothing between them.

Both are free to download. 毛毛虫 sells 3 in-app purchases, starting at $4.99 per 7 days and Baby Tracker sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

毛毛虫 ships an update monthly, Baby Tracker every 5 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 毛毛虫 | Baby Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 5 days** |
| Size | 42 MB | 69 MB |
| Requires iOS | **15.6** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [英杰 赵](https://appshunter.io/developer/1868268026) | [新景 常](https://appshunter.io/developer/1844859781) |

## What reviewers say

### 毛毛虫

[App page](https://appshunter.io/ios/app/raz/id6758662742)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周会员. | $4.99 | per 7 days |
| 半年会员 | $17.99 | per 6 months |
| 年度会员 | $24.99 | per year |


### Baby Tracker

[App page](https://appshunter.io/ios/app/baby-tracker/id6760815251)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 专业版月度订阅 | $0.99 | per month |
| 专业版年度会员 | $3.99 | per year |
| 专业版终生会员 | $2.99 | one-time |


## Frequently asked questions

### Is 毛毛虫 free?

毛毛虫 is free to download, with in-app purchases available.

### Is Baby Tracker free?

Baby Tracker is free to download, with in-app purchases available.

### Do 毛毛虫 or Baby Tracker have ads?

Both 毛毛虫 and Baby Tracker show ads.

### Which is updated more often, 毛毛虫 or Baby Tracker?

毛毛虫 ships an update monthly, and Baby Tracker every 5 days. Most recently, 毛毛虫 was updated on October 25, 2026 and Baby Tracker on October 28, 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.*