# Diary vs fuelOS

The clearest difference is ads: fuelOS at none against Diary's shown. Diary's advantage is update cadence (every 4 days vs every 3 weeks) and device support (3 vs 1). On price and in-app purchases there is nothing between them.

Both are free to download. Diary sells 3 in-app purchases, starting at $0.99 per month and fuelOS sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Diary ships an update every 4 days, fuelOS every 3 weeks. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Diary | fuelOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (12 ratings)](https://appshunter.io/ios/app/fuelos/id6756439581/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 96 MB | 37 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Almeida](https://appshunter.io/developer/1843195594) | [Abay Bektursun](https://appshunter.io/developer/1857023452) |

## What reviewers say

### Diary

[App page](https://appshunter.io/ios/app/diary-notes-tasks/id6753229937)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| 3 months | $2.99 | per 3 months |
| Annual | $5.99 | per year |


### fuelOS

[App page](https://appshunter.io/ios/app/fuelos/id6756439581)

Effortlessly track your nutrition with AI-powered food logging. Simply snap a photo, speak your meal, or scan a barcode to instantly understand your intake. Gain actionable insights into your diet to live healthier without the hassle of manual calorie counting.

**Highlights:** AI-powered food logging, Photo, voice, and barcode scanning, Effortless nutrition tracking, Actionable dietary insights, Micronutrient tracking (Pro), HealthKit integration (Pro)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| fuelOS Pro Monthly | $9.99 | per month |
| fuelOS Pro Annual | $89.99 | per year |


## Frequently asked questions

### Is Diary free?

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

### Is fuelOS free?

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

### Do Diary or fuelOS have ads?

Diary shows ads; fuelOS does not.

### Which is updated more often, Diary or fuelOS?

Diary ships an update every 4 days, and fuelOS every 3 weeks. Most recently, Diary was updated on October 14, 2026 and fuelOS on October 19, 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.*