# 科學Online vs 单词树

The clearest difference is in-app purchases: 科學Online at none against 单词树's 6. 科學Online also leads on iOS requirement (7.1 vs 17). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 单词树 sells 6 in-app purchases, starting at $15.49 per month. 科學Online asks for nothing beyond the download.

科學Online ships an update every 6 weeks, 单词树 every 2 months. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 科學Online | 单词树 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (29 ratings)](https://appshunter.io/ios/app/id1123301748/reviews)** |
| Number of ratings | — | **29** |
| Positive reviews | — | 78.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 63 MB |
| Requires iOS | **7.1** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mr.Crocodile](https://appshunter.io/developer/560102152) | [Li Wang](https://appshunter.io/developer/788390771) |

## What reviewers say

### 科學Online

[App page](https://appshunter.io/ios/app/online/id965057483)

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

**In-app purchases:** none


### 单词树

[App page](https://appshunter.io/ios/app/id1123301748)

This app helps you learn English vocabulary through interactive lessons, personalized review, and progress tracking. It offers a comprehensive dictionary with translations, examples, and pronunciation, along with various testing modes to solidify your learning.

**Highlights:** Extensive vocabulary lists for various exams, Detailed word information (translation, examples, pronunciation), Real-time pronunciation recording and comparison, Customizable word lists and notes, Spaced repetition and memory curve review, Progress tracking with charts and reports, Challenging listening and testing modes

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月会员 | $15.49 | per month |
| 3个月会员 | $28.99 | per 3 months |
| 1年会员 | $30.99 | per year |
| 金币100个 | $5.99 | one-time |
| 金币300个 | $9.99 | one-time |
| 金币3000个 | $25.99 | one-time |


## Frequently asked questions

### Is 科學Online free?

科學Online is free to download, with no in-app purchases.

### Is 单词树 free?

单词树 is free to download, with in-app purchases available.

### Do 科學Online or 单词树 have ads?

Neither 科學Online nor 单词树 shows ads.

### Which is updated more often, 科學Online or 单词树?

科學Online ships an update every 6 weeks, and 单词树 every 2 months. Most recently, 科學Online was updated on October 10, 2026 and 单词树 on October 24, 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.*