# MustDuo vs FastTrackr

The clearest difference is monetization model: MustDuo at free against FastTrackr's freemium. MustDuo also leads on ratings volume (17 vs 1). FastTrackr's advantage is iOS requirement (16.0 vs 18.5). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for MustDuo against 5.0 for FastTrackr. That said, the two scores are not equally well evidenced: MustDuo has 17 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Both ship on a similar rhythm, roughly fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | MustDuo | FastTrackr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (17 ratings)](https://appshunter.io/ios/app/mustduo/id6749694909/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/fasttrackr-fasting-tracker/id6760088716/reviews) |
| Number of ratings | **17** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | **Free** | Freemium |
| Size | 59 MB | 84 MB |
| Requires iOS | 18.5 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 12+ | 17+ |
| Developer | [MustDuo](https://appshunter.io/developer/1831771141) | [NEW VERSION LIMITED](https://appshunter.io/developer/1809498455) |

## What reviewers say

### MustDuo

[App page](https://appshunter.io/ios/app/mustduo/id6749694909)

This fitness app helps you build consistency and achieve your goals with real-time tracking and personalized plans. An AI coach provides guidance, motivation, and on-the-fly adjustments to keep you on track with your fitness journey.

**Highlights:** Smart workout tracking, Personalized workout plans, AI fitness coach, Habit building features, Gamified fitness experience, Progress analytics

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

**In-app purchases:** none


### FastTrackr

[App page](https://appshunter.io/ios/app/fasttrackr-fasting-tracker/id6760088716)

This app helps users track intermittent fasting with personalized plans and an AI assistant. It offers features for logging meals, water, and weight, along with insights into ketosis and autophagy zones. Users can also access recipes and meal planning tools.

**Highlights:** Intermittent fasting timer with ketosis zones, AI assistant for personalized guidance, Meal logging with AI calorie estimation, Water and weight tracking, Recipe library and meal planning, Progress charts and streaks

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

**In-app purchases:** none


## Frequently asked questions

### Is MustDuo free?

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

### Is FastTrackr free?

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

### Which has better reviews, MustDuo or FastTrackr?

MustDuo and FastTrackr are both rated 5.0 out of 5 on the App Store, from 17 and 1 ratings respectively.

### Do MustDuo or FastTrackr have ads?

Neither MustDuo nor FastTrackr shows ads.

### Which is updated more often, MustDuo or FastTrackr?

MustDuo ships an update fortnightly, and FastTrackr fortnightly. Most recently, MustDuo was updated on October 24, 2026 and FastTrackr on October 24, 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.*