# PDF翻译 vs Baby Tracker

The clearest difference is ads: PDF翻译 at none against Baby Tracker's shown. PDF翻译 also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. PDF翻译 sells 3 in-app purchases, starting at $7.99 per month 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.

PDF翻译 ships an update every 3 days, Baby Tracker every 5 days. The most recent releases landed on September 16, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | PDF翻译 | Baby Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 5 days |
| Size | 11 MB | 69 MB |
| Requires iOS | **15.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tianjin Junray Technology Co., Ltd.](https://appshunter.io/developer/1792139982) | [新景 常](https://appshunter.io/developer/1844859781) |

## What reviewers say

### PDF翻译

[App page](https://appshunter.io/ios/app/pdf/id6755518596)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包月 | $7.99 | per month |
| 单次翻译 | $0.99 | one-time |
| 永久会员 | $39.99 | one-time |


### 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 PDF翻译 free?

PDF翻译 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 PDF翻译 or Baby Tracker have ads?

Baby Tracker shows ads; PDF翻译 does not.

### Which is updated more often, PDF翻译 or Baby Tracker?

PDF翻译 ships an update every 3 days, and Baby Tracker every 5 days. Most recently, PDF翻译 was updated on September 16, 2026 and Baby Tracker on September 24, 2026.

---

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