# Doit TODO vs 牛牛模考

The clearest difference is in-app purchases: Doit TODO at none against 牛牛模考's 5. Doit TODO also leads on iOS requirement (12.0 vs 16.2). 牛牛模考's advantage is update cadence (every 2 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. 牛牛模考 sells 5 in-app purchases, starting at $0.99 per 3 months. Doit TODO asks for nothing beyond the download.

Doit TODO ships an update monthly, 牛牛模考 every 2 days. The most recent releases landed on September 8, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Doit TODO | 牛牛模考 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | — | Freemium |
| Size | 31 MB | 87 MB |
| Requires iOS | **12.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [旭 徐](https://appshunter.io/developer/1600180901) | [诚志 张](https://appshunter.io/developer/1765833656) |

## What reviewers say

### Doit TODO

[App page](https://appshunter.io/ios/app/doit-todo/id1623401995)

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

**In-app purchases:** none


### 牛牛模考

[App page](https://appshunter.io/ios/app/id6743365984)

This app offers simulated exam environments with timers and sound effects to help users practice for various tests. Users can create custom exam templates and manage subjects with specific durations and workflows. It also includes productivity tools like clocks to enhance study efficiency.

**Highlights:** Simulated exam environments, Customizable exam templates, Subject and duration management, Exam process sound effects, Productivity clock tools, Timed practice sessions

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 季度订阅 | $0.99 | per 3 months |
| 月度订阅 | $0.99 | per month |
| 半年订阅 | $1.99 | per 6 months |
| 年度订阅 | $3.99 | per year |
| 永久订阅 | $0.99 | one-time |


## Frequently asked questions

### Is Doit TODO free?

Doit TODO is free to download, with no in-app purchases.

### Is 牛牛模考 free?

牛牛模考 is free to download, with in-app purchases available.

### Do Doit TODO or 牛牛模考 have ads?

Neither Doit TODO nor 牛牛模考 shows ads.

### Which is updated more often, Doit TODO or 牛牛模考?

Doit TODO ships an update monthly, and 牛牛模考 every 2 days. Most recently, Doit TODO was updated on September 8, 2026 and 牛牛模考 on September 19, 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.*