# 倒数日 · Days Matter vs 错题本

The clearest difference is rating: 倒数日 · Days Matter at 4.8 against 错题本's 4.2. 倒数日 · Days Matter also leads on ratings volume (8.2K vs 5) and update cadence (every 3 weeks vs every 2 months). 错题本's advantage is ads (none vs shown). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. 倒数日 · Days Matter sells 11 in-app purchases, starting at $0.49 per month and 错题本 sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

倒数日 · Days Matter holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: 倒数日 · Days Matter has 8.2K ratings behind it against 5, so its average is the more settled of the two.

倒数日 · Days Matter ships an update every 3 weeks, 错题本 every 2 months. The most recent releases landed on September 29, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | 倒数日 · Days Matter | 错题本 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8.2K ratings)](https://appshunter.io/ios/app/days-matter/id406170251/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/id6448860597/reviews) |
| Number of ratings | **8.2K** | 5 |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 259 MB | 46 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iDaily Corp.](https://appshunter.io/developer/364264742) | [深圳市美易网科技有限公司](https://appshunter.io/developer/1647736306) |

## What reviewers say

### 倒数日 · Days Matter

[App page](https://appshunter.io/ios/app/days-matter/id406170251)

This app helps you track important dates, from birthdays and anniversaries to deadlines and personal milestones. It offers extensive date range support, cloud synchronization, and customizable categories to keep your memories and tasks organized. Features include historical date lookups and a built-in calculator.

**Highlights:** Countdown/count up to any date, Cloud synchronization, Lunar calendar support, Customizable categories, Historical dates, Date calculator, Password protection

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

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 倒数日 Pro · 月度会员 | $0.49 | per month |
| 倒数日相册 1000 张 | $0.99 | per month |
| 倒数日相册 2000 张 | $1.99 | per month |
| 倒数日相册 5000 张 | $3.99 | per month |
| 倒数日相册 10000 张 | $6.99 | per month |
| 倒数日重置密码 | $0.99 | one-time |
| メールアドレスカード | $2.99 | one-time |
| 咖啡 | $2.99 | one-time |
| Days Matter Pro | $4.99 | one-time |
| 银币 | $5.99 | one-time |
| 金币 | $14.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 📆 Helps remember important dates
- 🗓️ Useful for tracking events and milestones
- 🧠 Aids in recalling memories
- 🔍 Provides historical information

**What reviewers complain about**

- 💰 Some features require paid subscription
- 🌐 Lack of English language support
- 🔧 Occasional bugs and crashes
- 🔍 Cluttered interface for some users
- ⚠️ Unexpected changes to login/sync methods

**Reported bugs**

- Incorrect date display in widget
- Inconsistent behavior when changing phones
- Sync issues causing data loss
- Unexpected app behavior after updates

**Requested features**

- Add English language option
- Improve widget customization
- Provide more theme/background options
- Allow manual date entry format customization
- Implement sync with other calendar apps


### 错题本

[App page](https://appshunter.io/ios/app/id6448860597)

This learning tool helps students and parents efficiently manage incorrect answers from homework and tests. It uses advanced technology to quickly capture, organize, and review mistakes, making studying smarter and more effective.

**Highlights:** Photo capture of incorrect answers, Automatic removal of handwriting, Subject-based categorization, Detailed breakdown of questions and solutions, Custom practice test generation, Daily review for targeted learning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 连续包月 | $1.99 | per month |
| 连续包年 | $9.99 | per year |


## Frequently asked questions

### Is 倒数日 · Days Matter free?

倒数日 · Days Matter is free to download, with in-app purchases available.

### Is 错题本 free?

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

### Which has better reviews, 倒数日 · Days Matter or 错题本?

倒数日 · Days Matter is rated higher. 倒数日 · Days Matter averages 4.8 out of 5 from 8.2K ratings, while 错题本 averages 4.2 from 5 ratings.

### Do 倒数日 · Days Matter or 错题本 have ads?

倒数日 · Days Matter shows ads; 错题本 does not.

### Which is updated more often, 倒数日 · Days Matter or 错题本?

倒数日 · Days Matter ships an update every 3 weeks, and 错题本 every 2 months. Most recently, 倒数日 · Days Matter was updated on September 29, 2026 and 错题本 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.*