# Osmo Numbers Classic vs Katachi

The clearest difference is in-app purchases: Osmo Numbers Classic at none against Katachi's 1. Osmo Numbers Classic also leads on ads (none vs shown) and device support (3 vs 1). Katachi's advantage is update cadence (monthly vs every 2 months). On price there is nothing between them.

Both are free to download. Katachi sells 1 one-off in-app purchase. Osmo Numbers Classic asks for nothing beyond the download.

Osmo Numbers Classic ships an update every 2 months, Katachi monthly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Osmo Numbers Classic | Katachi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (264 ratings)](https://appshunter.io/ios/app/osmo-numbers-classic/id1017627073/reviews)** | — |
| Number of ratings | **264** | — |
| Positive reviews | 55.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 185 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tangible Play](https://appshunter.io/developer/799157444) | [atsuko imai](https://appshunter.io/developer/1830783417) |

## What reviewers say

### Osmo Numbers Classic

[App page](https://appshunter.io/ios/app/osmo-numbers-classic/id1017627073)

Engage children in hands-on math play by adding, counting, and multiplying tiles to pop number bubbles. This interactive game fosters a creative and explorative mindset towards mathematics, making learning fun and engaging in a vibrant underwater world.

**Highlights:** Add, count, and multiply tiles, Pop number bubbles, Collect over 90 unique fish, Learn math creatively, Develop problem-solving skills, Hands-on play experience

**In-app purchases:** none

**What reviewers like**

- 👍 Great for learning math
- 👍 Interactive and fun
- 👍 Engaging for children
- 👍 Motivates learning
- 👍 Good for practicing numbers

**What reviewers complain about**

- 🐛 Repetitive gameplay
- 🐛 Gets boring quickly
- 🐛 Confusing for younger kids
- 🐛 Expensive hardware needed
- 🐛 Inconsistent tile recognition

**Reported bugs**

- Apps not loading
- Never-ending loading screen
- App crashes
- Cannot access camera
- Doesn't recognize tiles properly

**Requested features**

- Add more levels
- Include verbal number prompts
- Simpler starting point for younger kids
- More varied gameplay types
- Add an exit button for games


### Katachi

[App page](https://appshunter.io/ios/app/katachi-shape-reflex-puzzle/id6760748598)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Osmo Numbers Classic free?

Osmo Numbers Classic is free to download, with no in-app purchases.

### Is Katachi free?

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

### Do Osmo Numbers Classic or Katachi have ads?

Katachi shows ads; Osmo Numbers Classic does not.

### Which is updated more often, Osmo Numbers Classic or Katachi?

Osmo Numbers Classic ships an update every 2 months, and Katachi monthly. Most recently, Osmo Numbers Classic was updated on October 21, 2026 and Katachi on October 24, 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.*