# PET vs Knot Diary

The clearest difference is in-app purchases: PET at none against Knot Diary's 3. PET also leads on iOS requirement (13.0 vs 17.0). Knot Diary's advantage is update cadence (every 11 days vs monthly). On price, ads 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. PET asks for nothing beyond the download.

PET ships an update monthly, Knot Diary every 11 days. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | PET | Knot Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 11 days** |
| Size | 46 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [金芳 郭](https://appshunter.io/developer/1701870847) | [桃花 秦](https://appshunter.io/developer/1877272960) |

## What reviewers say

### PET

[App page](https://appshunter.io/ios/app/pet-diary/id6743213111)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is PET free?

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

### Is Knot Diary free?

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

### Do PET or Knot Diary have ads?

Neither PET nor Knot Diary shows ads.

### Which is updated more often, PET or Knot Diary?

PET ships an update monthly, and Knot Diary every 11 days. Most recently, PET was updated on October 5, 2026 and Knot Diary on October 6, 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.*