# DietDiary AI vs Source

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

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

DietDiary AI ships an update every 4 days, Source fortnightly. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | DietDiary AI | Source |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Fortnightly |
| Size | 33 MB | 62 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [GivenNow](https://appshunter.io/developer/480553770) | [CHANG-WEI FU](https://appshunter.io/developer/1837600448) |

## What reviewers say

### DietDiary AI

[App page](https://appshunter.io/ios/app/dietdiary-ai-calorie-tracker/id6755058085)

**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 DietDiary AI free?

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

### Is Source free?

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

### Do DietDiary AI or Source have ads?

DietDiary AI shows ads; Source does not.

### Which is updated more often, DietDiary AI or Source?

DietDiary AI ships an update every 4 days, and Source fortnightly. Most recently, DietDiary AI was updated on October 8, 2026 and Source on October 16, 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.*