# GM ChessPrep vs Source

The clearest difference is in-app purchases: GM ChessPrep at none against Source's 4. Source's advantage is update cadence (every 3 weeks vs every 42 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Source sells 4 in-app purchases, starting at $24.99 per month. GM ChessPrep asks for nothing beyond the download.

GM ChessPrep ships an update every 42 months, Source every 3 weeks. The most recent releases landed on October 2, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | GM ChessPrep | Source |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 3 weeks** |
| Size | 3 MB | 313 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [GMCHESSPREP LLC](https://appshunter.io/developer/1664061168) | [Super Real Inc](https://appshunter.io/developer/1891188531) |

## What reviewers say

### GM ChessPrep

[App page](https://appshunter.io/ios/app/gm-chessprep/id1664061166)

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

**In-app purchases:** none


### Source

[App page](https://appshunter.io/ios/app/source-find-yourself/id6761737790)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Committed Membership | $24.99 | per month |
| Committed Membership (3-months) | $69.99 | per 3 months |
| Committed Membership (6 months) | $125.99 | per 6 months |
| Committed Membership (1-year) | $229.00 | per year |


## Frequently asked questions

### Is GM ChessPrep free?

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

### Is Source free?

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

### Do GM ChessPrep or Source have ads?

Neither GM ChessPrep nor Source shows ads.

### Which is updated more often, GM ChessPrep or Source?

GM ChessPrep ships an update every 42 months, and Source every 3 weeks. Most recently, GM ChessPrep was updated on October 2, 2026 and Source on October 14, 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.*