# Kitty vs Dian Dian

The clearest difference is ads: Kitty at none against Dian Dian's shown. Dian Dian's advantage is update cadence (every 4 days vs every 2 weeks) and iOS requirement (13.0 vs 15.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Kitty sells 3 one-off in-app purchases and Dian Dian sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Kitty ships an update every 2 weeks, Dian Dian every 4 days. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Kitty | Dian Dian |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Size | 96 MB | 58 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [odd taxi](https://appshunter.io/developer/1668660946) | [Override SAS](https://appshunter.io/developer/1888186144) |

## What reviewers say

### Kitty

[App page](https://appshunter.io/ios/app/kitty-cat-study-timer/id6757783153)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7天会员 | $0.99 | one-time |
| 月度会员 | $3.99 | one-time |
| 年度会员 | $29.99 | one-time |


### Dian Dian

[App page](https://appshunter.io/ios/app/dian-dian-year-tracker/id6761432329)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Yearly | $8.99 | per year |
| Premium Lifetime | $22.99 | one-time |


## Frequently asked questions

### Is Kitty free?

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

### Is Dian Dian free?

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

### Do Kitty or Dian Dian have ads?

Dian Dian shows ads; Kitty does not.

### Which is updated more often, Kitty or Dian Dian?

Kitty ships an update every 2 weeks, and Dian Dian every 4 days. Most recently, Kitty was updated on October 10, 2026 and Dian Dian on October 2, 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.*