# Simple Add Subtract vs Hello Kitty

The clearest difference is in-app purchases: Simple Add Subtract at none against Hello Kitty's 5. Hello Kitty's advantage is update cadence (every 2 months vs every 42 months) and iOS requirement (15.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Hello Kitty sells 5 in-app purchases, starting at $1.99 per 7 days. Simple Add Subtract asks for nothing beyond the download.

Simple Add Subtract ships an update every 42 months, Hello Kitty every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Simple Add Subtract | Hello Kitty |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (643 ratings)](https://appshunter.io/ios/app/hello-kitty-good-night-tale/id1566525334/reviews)** |
| Number of ratings | — | **643** |
| Positive reviews | — | 77.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 42 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 6 MB | 232 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hong Yu](https://appshunter.io/developer/1461721611) | [Oculist](https://appshunter.io/developer/1260501789) |

## What reviewers say

### Simple Add Subtract

[App page](https://appshunter.io/ios/app/simple-add-subtract/id1473721165)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hello Kitty

[App page](https://appshunter.io/ios/app/hello-kitty-good-night-tale/id1566525334)

Help adorable kittens get ready for bed by engaging in fun activities like sorting photos and drawing. This mini-game makes bedtime routines enjoyable for children, turning preparation for sleep into a playful experience.

**Highlights:** Help kittens fall asleep, Sorting photos, Drawing activities, Bedtime stories, Educational mini-games

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $1.99 | per 7 days |
| Monthly subscription | $3.99 | per month |
| Annual subscription | $7.99 | per year |
| No ads | $1.99 | one-time |
| Full version + no ads | $9.99 | one-time |

**What reviewers like**

- 💕 Cute and comfortable game
- 🤗 Helps with relaxation and sleep
- 🎨 Lovely art and graphics
- 👍 Fun and engaging gameplay

**What reviewers complain about**

- 💰 Many features locked behind paywall
- 📺 Excessive advertisements
- 🕰️ Repetitive and can get boring over time

**Reported bugs**

- Game freezes or crashes on certain devices
- Saved progress not loading properly

**Requested features**

- Add more playable characters and customization options
- Introduce more diverse gameplay activities
- Reduce the number of advertisements or make them less intrusive


## Frequently asked questions

### Is Simple Add Subtract free?

Simple Add Subtract is free to download, with no in-app purchases.

### Is Hello Kitty free?

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

### Do Simple Add Subtract or Hello Kitty have ads?

Both Simple Add Subtract and Hello Kitty show ads.

### Which is updated more often, Simple Add Subtract or Hello Kitty?

Simple Add Subtract ships an update every 42 months, and Hello Kitty every 2 months. Most recently, Simple Add Subtract was updated on November 3, 2026 and Hello Kitty on November 3, 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.*