# Life Countdown vs CatKey

The clearest difference is price: CatKey at Free against Life Countdown's $4.99. Life Countdown's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

CatKey is free to download; Life Countdown costs $4.99 up front. CatKey sells 1 one-off in-app purchase. Life Countdown asks for nothing beyond the download.

Life Countdown ships an update monthly, CatKey every 2 months. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Life Countdown | CatKey |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Paid | — |
| Size | 27 MB | 4 MB |
| Requires iOS | 17.6 | **17** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [雷雷 张](https://appshunter.io/developer/1803875512) | [贺 周](https://appshunter.io/developer/1815397078) |

## What reviewers say

### Life Countdown

[App page](https://appshunter.io/ios/app/life-countdown-days-left/id6751584119)

This app helps you visualize your remaining time by calculating days lived and days left based on your birthday and expected lifespan. It offers a deep space theme, extensive iOS widgets, and prioritizes user privacy with local data storage. All core features are free to use.

**Highlights:** Calculates days lived and remaining, Personalized expected lifespan setting, Deep space theme, Extensive iOS widgets, Local data storage, 14 language support

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

**In-app purchases:** none


### CatKey

[App page](https://appshunter.io/ios/app/catkey/id6784041022)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CatKey Pro | $3.99 | one-time |


## Frequently asked questions

### Is Life Countdown free?

Life Countdown costs $4.99, with no in-app purchases.

### Is CatKey free?

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

### Do Life Countdown or CatKey have ads?

Neither Life Countdown nor CatKey shows ads.

### Which is updated more often, Life Countdown or CatKey?

Life Countdown ships an update monthly, and CatKey every 2 months. Most recently, Life Countdown was updated on October 6, 2026 and CatKey on October 4, 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.*