# 学而时习之 vs CheckOne

学而时习之 and CheckOne are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 学而时习之 sells 2 one-off in-app purchases and CheckOne sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 学而时习之 | CheckOne |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/id1593148033/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 14 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [红晓 赵](https://appshunter.io/developer/1516558450) | [Mishima Design](https://appshunter.io/developer/373060551) |

## What reviewers say

### 学而时习之

[App page](https://appshunter.io/ios/app/id1593148033)

This app helps improve learning efficiency and memory through scientific brain usage techniques. It offers automatic review reminders for tasks and provides brain science knowledge to enhance understanding and recall.

**Highlights:** Automatic review reminders for learning tasks, Brain science knowledge tips, Customizable learning tasks, Daily task overview reminders, iCloud data synchronization, Reading notes on brain science

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 我是学生(永久会员) | $2.99 | one-time |
| 永久会员 | $3.99 | one-time |


### CheckOne

[App page](https://appshunter.io/ios/app/checkone/id6785709065)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CheckOne Plus | $9.99 | one-time |


## Frequently asked questions

### Is 学而时习之 free?

学而时习之 is free to download, with in-app purchases available.

### Is CheckOne free?

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

### Do 学而时习之 or CheckOne have ads?

Neither 学而时习之 nor CheckOne shows ads.

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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.*