# Subtraction Skill Builders vs Autifly

The clearest difference is price: Autifly at Free against Subtraction Skill Builders's $2.99. Autifly also leads on update cadence (every 8 days vs every 28 months). Subtraction Skill Builders's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Autifly is free to download; Subtraction Skill Builders costs $2.99 up front. Autifly sells 2 in-app purchases, starting at $29.00 per month. Subtraction Skill Builders asks for nothing beyond the download.

Subtraction Skill Builders ships an update every 28 months, Autifly every 8 days. The most recent releases landed on October 31, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Subtraction Skill Builders | Autifly |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 8 days** |
| Size | 18 MB | 39 MB |
| Requires iOS | **12.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sergey Malugin](https://appshunter.io/developer/562782409) | [HeiTech Oy](https://appshunter.io/developer/1608294597) |

## What reviewers say

### Subtraction Skill Builders

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Autifly

[App page](https://appshunter.io/ios/app/autifly/id6745534132)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic monthly | $29.00 | per month |
| Pro Yearly | $249.00 | per year |


## Frequently asked questions

### Is Subtraction Skill Builders free?

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

### Is Autifly free?

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

### Do Subtraction Skill Builders or Autifly have ads?

Neither Subtraction Skill Builders nor Autifly shows ads.

### Which is updated more often, Subtraction Skill Builders or Autifly?

Subtraction Skill Builders ships an update every 28 months, and Autifly every 8 days. Most recently, Subtraction Skill Builders was updated on October 31, 2026 and Autifly on November 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.*