# 元气背单词 vs 几何星球

The clearest difference is price: 几何星球 at Free against 元气背单词's $1.99. 元气背单词's advantage is in-app purchases (none vs 12) and device support (3 vs 1). On update cadence and ads there is nothing between them.

几何星球 is free to download; 元气背单词 costs $1.99 up front. 几何星球 sells 12 one-off in-app purchases. 元气背单词 asks for nothing beyond the download.

元气背单词 ships an update weekly, 几何星球 every 4 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 元气背单词 | 几何星球 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/id6446756014/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 53.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Paid | — |
| Size | 185 MB | 30 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [大连森林互动科技有限公司](https://appshunter.io/developer/1602532041) | [Zenith Education Technology (Beijing) Co., Ltd.](https://appshunter.io/developer/1412589877) |

## What reviewers say

### 元气背单词

[App page](https://appshunter.io/ios/app/id6446756014)

This app uses the Ebbinghaus forgetting curve to help you learn English vocabulary efficiently. It offers a clean, ad-free interface with various study modes and official word lists. Sync your progress across devices and export your study plans.

**Highlights:** Ebbinghaus memory method, Ad-free learning experience, Official and authoritative word lists, Multiple auxiliary learning modes, Mark unknown words, Cloud backup and synchronization, PDF export

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

**In-app purchases:** none


### 几何星球

[App page](https://appshunter.io/ios/app/id6818393957)

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 视频导出买断 | $0.99 | one-time |
| 高频几何模型题库 | $1.99 | one-time |
| 圆的阴影面积题库 | $1.99 | one-time |
| 阴影面积进阶题库 | $1.99 | one-time |
| 折叠问题题库 | $1.99 | one-time |
| 旋转问题题库 | $1.99 | one-time |
| 中点与中位线题库 | $1.99 | one-time |
| 相似模型题库 | $1.99 | one-time |
| 勾股定理题库 | $1.99 | one-time |
| 江苏真题精选题库 | $1.99 | one-time |
| 经典几何模型题库 | $1.99 | one-time |
| 全解锁买断 | $14.99 | one-time |


## Frequently asked questions

### Is 元气背单词 free?

元气背单词 costs $1.99, with no in-app purchases.

### Is 几何星球 free?

几何星球 is free to download, with in-app purchases available.

### Do 元气背单词 or 几何星球 have ads?

Neither 元气背单词 nor 几何星球 shows ads.

### Which is updated more often, 元气背单词 or 几何星球?

元气背单词 ships an update weekly, and 几何星球 every 4 days. Most recently, 元气背单词 was updated on October 25, 2026 and 几何星球 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.*