# Knot Diary vs 同频sync

The clearest difference is update cadence: 同频sync at every 2 days against Knot Diary's every 11 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Knot Diary sells 3 in-app purchases, starting at $0.99 per month and 同频sync sells 6 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Knot Diary ships an update every 11 days, 同频sync every 2 days. The most recent releases landed on October 6, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Knot Diary | 同频sync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 2 days** |
| Size | 3 MB | 22 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [桃花 秦](https://appshunter.io/developer/1877272960) | [磊 董](https://appshunter.io/developer/6808440096) |

## What reviewers say

### Knot Diary

[App page](https://appshunter.io/ios/app/knot-diary/id6801838141)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knot Diary Pro (Monthly) | $0.99 | per month |
| Knot Diary Pro (Quarterly) | $2.99 | per 3 months |
| Knot Diary Pro (Yearly) | $6.99 | per year |


### 同频sync

[App page](https://appshunter.io/ios/app/sync/id6808456087)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 同频pro月度会员 | $1.99 | per month |
| 同频 Pro年度会员 | $19.99 | per year |
| 同频 Pro 固定期限会员（1年） | $9.99 | one-time |
| 同频 Pro 固定期限会员（2年） | $22.99 | one-time |
| 同频 Pro 固定期限会员（3年） | $29.99 | one-time |
| 同频sync终身会员 | $39.99 | one-time |


## Frequently asked questions

### Is Knot Diary free?

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

### Is 同频sync free?

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

### Do Knot Diary or 同频sync have ads?

Neither Knot Diary nor 同频sync shows ads.

### Which is updated more often, Knot Diary or 同频sync?

Knot Diary ships an update every 11 days, and 同频sync every 2 days. Most recently, Knot Diary was updated on October 6, 2026 and 同频sync on October 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.*