# Happy Kitty Calculator vs WallJoy

The clearest difference is price: Happy Kitty Calculator at Free against WallJoy's $0.99. Happy Kitty Calculator also leads on update cadence (every 3 weeks vs every 2 months). WallJoy's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Happy Kitty Calculator is free to download; WallJoy costs $0.99 up front. Happy Kitty Calculator sells 1 one-off in-app purchase. WallJoy asks for nothing beyond the download.

Happy Kitty Calculator ships an update every 3 weeks, WallJoy every 2 months. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Happy Kitty Calculator | WallJoy |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | — | Paid |
| Size | 59 MB | 6 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HUA-TENG HUANG](https://appshunter.io/developer/1780056727) | [xiaolin jiang](https://appshunter.io/developer/1886634416) |

## What reviewers say

### Happy Kitty Calculator

[App page](https://appshunter.io/ios/app/happy-kitty-calculator/id6739179959)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One-time purchase. | $2.99 | one-time |


### WallJoy

[App page](https://appshunter.io/ios/app/walljoy/id6761767097)

Explore millions of high-quality, high-resolution wallpapers across numerous categories. Discover daily picks, save your favorites, and find the perfect background with powerful search tools. Enjoy a clean, ad-free experience with this free utility.

**Highlights:** Millions of HD wallpapers, Smart categories, Daily fresh recommendations, Powerful keyword search, One-tap save, Personal favorites collection

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

**In-app purchases:** none


## Frequently asked questions

### Is Happy Kitty Calculator free?

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

### Is WallJoy free?

WallJoy costs $0.99, with no in-app purchases.

### Do Happy Kitty Calculator or WallJoy have ads?

Neither Happy Kitty Calculator nor WallJoy shows ads.

### Which is updated more often, Happy Kitty Calculator or WallJoy?

Happy Kitty Calculator ships an update every 3 weeks, and WallJoy every 2 months. Most recently, Happy Kitty Calculator was updated on October 25, 2026 and WallJoy on October 8, 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.*