My DuIN vs SmartFasting
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
My DuIN
Monitor workouts, track progress, and achieve fitness goals with personalized plans and engaging challenges. Seamlessly record gym sessions or manual entries, and book classes to stay motivated.
- Workout tracking
- Personalized training plans
- Activity level monitoring
- Fun challenges with rewards
- Class scheduling and booking
- HealthKit integration
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Elevate your fitness routine with the app! It's your all-in-one solution to easily monitor your workouts, track progress, and achieve your fitness goals with engaging insights and motivation. The app offers an array of features, including: Workout Tracking Seamlessly capture all your workout data from gym equipment or manually enter it for a complete record. Training Plans Optimize your workouts with personalized plans provided by your fitness facility or trainer. Activity Levels Stay motivated with encouraging milestones as you progress to higher levels. Fun Challenges Challenge yourself with time-based activities that reward you with kudos, activity points, and prizes. Schedules Manage and book classes with ease to keep yourself on track. And much more! The app integrates with HealthKit to help you save your workouts and contribute to your fitness goals and challenges. Have a comment or question about the app? Email our team directly at digitalsupport@egym.com.
SmartFasting
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SmartFasting: Fasting & Macros Fasting is about more than just a timer; it’s about how you nourish your body during your eating window. SmartFast is built for those who want a precision tool to manage their protocols while prioritizing muscle maintenance through smart protein tracking. Stop guessing and start measuring what actually moves the needle. Key Features: Precision Fasting Timer: Seamlessly manage 16:8, 18:6, or custom protocols with a clean, distraction-free interface. Protein & Macro Focus: Dedicated tracking to ensure you hit your nutritional targets and protect your gains while losing fat. Performance Reports: Weekly data breakdowns that show your consistency, average protein intake, and progress over time. Strategic Refeeding: Get hand-picked recipe suggestions designed to break your fast with the right nutrients to avoid energy crashes. Lightweight & Fast: No clutter. No unnecessary notifications. Just the data you need to stay disciplined. Whether you're new to intermittent fasting or an experienced athlete, SmartFast provides the structure you need to master your metabolism. Fast with intent. Break with purpose.
Screenshots
Verdict
The clearest difference is in-app purchases: My DuIN at none against SmartFasting's 1. My DuIN also leads on iOS requirement (15.0 vs 26.2). SmartFasting's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. SmartFasting sells 1 one-off in-app purchase. My DuIN asks for nothing beyond the download.
My DuIN ships an update every 2 months, SmartFasting every 2 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.
| Parameter | My DuIN | SmartFasting |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 88.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 173 MB | 2 MB |
| Age rating | 12+ | 4+ |
| Developer | Duet Spa & Sports, SL | Juan Delgado |
In-app purchases
My DuIN
No in-app purchases
SmartFasting
- SmartFast Premium$4.99









