# GreyMist Studio vs Source

The clearest difference is in-app purchases: GreyMist Studio at none against Source's 3. GreyMist Studio also leads on iOS requirement (13.0 vs 15.1). Source's advantage is update cadence (fortnightly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Source sells 3 in-app purchases, starting at $7.99 per month. GreyMist Studio asks for nothing beyond the download.

GreyMist Studio ships an update every 3 months, Source fortnightly. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | GreyMist Studio | Source |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 81 MB | 62 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [HSUANPEI LAO](https://appshunter.io/developer/1676182192) | [CHANG-WEI FU](https://appshunter.io/developer/1837600448) |

## What reviewers say

### GreyMist Studio

[App page](https://appshunter.io/ios/app/greymist-studio/id1588528819)

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

**In-app purchases:** none


### Source

[App page](https://appshunter.io/ios/app/source-ai-copilot/id6756547151)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Source Pro (月費) | $7.99 | per month |
| Source Pro (年費) | $49.99 | per year |
| Source Pro 創始會員 | $99.99 | one-time |


## Frequently asked questions

### Is GreyMist Studio free?

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

### Is Source free?

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

### Do GreyMist Studio or Source have ads?

Neither GreyMist Studio nor Source shows ads.

### Which is updated more often, GreyMist Studio or Source?

GreyMist Studio ships an update every 3 months, and Source fortnightly. Most recently, GreyMist Studio was updated on September 10, 2026 and Source on September 11, 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.*