# Blue Mood Tracker vs Cognitive Diary

The clearest difference is in-app purchases: Blue Mood Tracker at none against Cognitive Diary's 2. Cognitive Diary's advantage is update cadence (fortnightly vs every 45 months) and iOS requirement (16.4 vs 26.6). On price, ads and device support there is nothing between them.

Both are free to download. Cognitive Diary sells 2 in-app purchases, starting at $0.99 per month. Blue Mood Tracker asks for nothing beyond the download.

Blue Mood Tracker ships an update every 45 months, Cognitive Diary fortnightly. The most recent releases landed on November 7, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Blue Mood Tracker | Cognitive Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 45 months | **Fortnightly** |
| Size | 2 MB | 60 MB |
| Requires iOS | 26.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Ryan Hunter](https://appshunter.io/developer/1456867166) | [Vitalii Kovalov](https://appshunter.io/developer/1864691271) |

## What reviewers say

### Blue Mood Tracker

[App page](https://appshunter.io/ios/app/blue-mood-tracker/id6444869248)

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

**In-app purchases:** none


### Cognitive Diary

[App page](https://appshunter.io/ios/app/cognitive-diary/id6757118591)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO | $0.99 | per month |
| PRO | $9.99 | per year |


## Frequently asked questions

### Is Blue Mood Tracker free?

Blue Mood Tracker is free to download, with no in-app purchases.

### Is Cognitive Diary free?

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

### Do Blue Mood Tracker or Cognitive Diary have ads?

Neither Blue Mood Tracker nor Cognitive Diary shows ads.

### Which is updated more often, Blue Mood Tracker or Cognitive Diary?

Blue Mood Tracker ships an update every 45 months, and Cognitive Diary fortnightly. Most recently, Blue Mood Tracker was updated on November 7, 2026 and Cognitive Diary on November 9, 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.*