# 倒数日 · Days Matter vs 知音楼HD

The clearest difference is in-app purchases: 知音楼HD at none against 倒数日 · Days Matter's 11. 知音楼HD also leads on ads (none vs shown). 倒数日 · Days Matter's advantage is device support (4 vs 1). On price, update cadence and iOS requirement 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. 知音楼HD asks for nothing beyond the download.

倒数日 · Days Matter ships an update every 3 weeks, 知音楼HD fortnightly. The most recent releases landed on September 29, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 倒数日 · Days Matter | 知音楼HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8.2K ratings)](https://appshunter.io/ios/app/days-matter/id406170251/reviews)** | — |
| Number of ratings | **8.2K** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 259 MB | 595 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPad |
| Age rating | 4+ | 17+ |
| Developer | [iDaily Corp.](https://appshunter.io/developer/364264742) | [亿度慧达教育科技(北京)有限公司](https://appshunter.io/developer/564755477) |

## 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


### 知音楼HD

[App page](https://appshunter.io/ios/app/hd/id1523039519)

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

**In-app purchases:** none


## 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 知音楼HD free?

知音楼HD is free to download, with no in-app purchases.

### Do 倒数日 · Days Matter or 知音楼HD have ads?

倒数日 · Days Matter shows ads; 知音楼HD does not.

### Which is updated more often, 倒数日 · Days Matter or 知音楼HD?

倒数日 · Days Matter ships an update every 3 weeks, and 知音楼HD fortnightly. Most recently, 倒数日 · Days Matter was updated on September 29, 2026 and 知音楼HD on September 16, 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.*