# CodeStack AI vs iSOLID

The clearest difference is in-app purchases: iSOLID at none against CodeStack AI's 2. iSOLID also leads on update cadence (every 4 days vs every 3 weeks). CodeStack AI's advantage is iOS requirement (13.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. CodeStack AI sells 2 in-app purchases, starting at $2.99 per month. iSOLID asks for nothing beyond the download.

CodeStack AI ships an update every 3 weeks, iSOLID every 4 days. The most recent releases landed on September 15, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | CodeStack AI | iSOLID |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 29 MB | 19 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CODE NINJA COACHING LIMITED](https://appshunter.io/developer/1687825183) | [Nikolai Borisov](https://appshunter.io/developer/1838085350) |

## What reviewers say

### CodeStack AI

[App page](https://appshunter.io/ios/app/codestack-ai-learn-to-code/id6451455856)

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Access | $2.99 | per month |
| Pro Yearly Access | $19.99 | per year |


### iSOLID

[App page](https://appshunter.io/ios/app/isolid-learn-programming/id6752113008)

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

**In-app purchases:** none


## Frequently asked questions

### Is CodeStack AI free?

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

### Is iSOLID free?

iSOLID is free to download, with no in-app purchases.

### Do CodeStack AI or iSOLID have ads?

Neither CodeStack AI nor iSOLID shows ads.

### Which is updated more often, CodeStack AI or iSOLID?

CodeStack AI ships an update every 3 weeks, and iSOLID every 4 days. Most recently, CodeStack AI was updated on September 15, 2026 and iSOLID on September 13, 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.*