# Subtraction Skill Builders vs Learn Cello AI Tutor

The clearest difference is price: Learn Cello AI Tutor at Free against Subtraction Skill Builders's $2.99. Learn Cello AI Tutor also leads on update cadence (every 4 months vs every 28 months). Subtraction Skill Builders's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 15.1). On ads and device support there is nothing between them.

Learn Cello AI Tutor is free to download; Subtraction Skill Builders costs $2.99 up front. Learn Cello AI Tutor sells 2 in-app purchases, starting at $4.99 per month. Subtraction Skill Builders asks for nothing beyond the download.

Subtraction Skill Builders ships an update every 28 months, Learn Cello AI Tutor every 4 months. The most recent releases landed on October 31, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Subtraction Skill Builders | Learn Cello AI Tutor |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/learn-cello-ai-tutor/id6748557867/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 4 months** |
| Monetization | — | Subscription |
| Size | 18 MB | 44 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sergey Malugin](https://appshunter.io/developer/562782409) | [Brittney Pilarcik](https://appshunter.io/developer/1820885613) |

## What reviewers say

### Subtraction Skill Builders

[App page](https://appshunter.io/ios/app/subtraction-skill-builders/id1271517241)

**Features:** macOS Compatibility

**In-app purchases:** none


### Learn Cello AI Tutor

[App page](https://appshunter.io/ios/app/learn-cello-ai-tutor/id6748557867)

Master the cello with an AI tutor offering interactive lessons, fingerboard charts, and instant answers to your cello questions. Ideal for beginners and intermediate players seeking daily improvement without private lessons.

**Highlights:** Interactive beginner lessons, Fingerboard charts, AI chat for cello questions, Smart finger-position overlay, Personal stats tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Yearly Premium | $29.99 | per year |


## Frequently asked questions

### Is Subtraction Skill Builders free?

Subtraction Skill Builders costs $2.99, with no in-app purchases.

### Is Learn Cello AI Tutor free?

Learn Cello AI Tutor is free to download, with in-app purchases available.

### Do Subtraction Skill Builders or Learn Cello AI Tutor have ads?

Neither Subtraction Skill Builders nor Learn Cello AI Tutor shows ads.

### Which is updated more often, Subtraction Skill Builders or Learn Cello AI Tutor?

Subtraction Skill Builders ships an update every 28 months, and Learn Cello AI Tutor every 4 months. Most recently, Subtraction Skill Builders was updated on October 31, 2026 and Learn Cello AI Tutor on October 30, 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.*