# 三十天挑战 vs Cirkiter

The clearest difference is in-app purchases: 三十天挑战 at none against Cirkiter's 2. 三十天挑战 also leads on iOS requirement (12.0 vs 18.0). Cirkiter's advantage is device support. On price there is nothing between them.

Both are free to download. Cirkiter sells 2 in-app purchases, starting at $9.99 per year. 三十天挑战 asks for nothing beyond the download.

## The numbers

| Metric | 三十天挑战 | Cirkiter |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 5 days |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 24 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Zhuhai Record Yi Technology Co.,Ltd.](https://appshunter.io/developer/1638483191) | [雨 龙](https://appshunter.io/developer/1836934906) |

## What reviewers say

### 三十天挑战

[App page](https://appshunter.io/ios/app/id6748619161)

**In-app purchases:** none


### Cirkiter

[App page](https://appshunter.io/ios/app/cirkiter/id6804396226)

This app helps you memorize information using visual cues. Mark important phrases in text and then try to recall them from memory using only your cues. It tracks your progress and allows you to focus on areas you find difficult.

**Highlights:** Create study material from pasted text or scanned pages, Mark phrases as visual memory cues, Recall by typing or speaking, Reveal answers and revisit uncertain parts, Track study time and accuracy, Organize study material by project, Multi-language support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cirkit Plus Annual | $9.99 | per year |
| Cirkit Pro Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is 三十天挑战 free?

三十天挑战 is free to download, with no in-app purchases.

### Is Cirkiter free?

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

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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.*