Comparison

My DuIN vs SmartFasting

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Workout tracking
  • Personalized training plans
  • Activity level monitoring
  • Fun challenges with rewards
  • Class scheduling and booking
  • HealthKit integration
Features
Read full description

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.

About

SmartFasting

Features
Read full description

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

My DuIN4 screens
SmartFasting4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SmartFasting sells 1 one-off in-app purchase. My DuIN asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
My DuIN versus SmartFasting: the parameters behind the verdict, then further details
ParameterMy DuINSmartFasting
PriceFreeFree
Rating4.0 (1 ratings) — better—
Positive reviews88.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.0 — better26.2
Further details — not scored
Size173 MB2 MB
Age rating12+4+
DeveloperDuet Spa & Sports, SLJuan Delgado

In-app purchases

None

My DuIN

No in-app purchases

1 purchases

SmartFasting

One-time1
  • SmartFast Premium$4.99

Questions

Is My DuIN free?
My DuIN is free to download, with no in-app purchases.
Is SmartFasting free?
SmartFasting is free to download, with in-app purchases available.
Do My DuIN or SmartFasting have ads?
Neither My DuIN nor SmartFasting shows ads.
Which is updated more often, My DuIN or SmartFasting?
My DuIN ships an update every 2 months, and SmartFasting every 2 weeks. Most recently, My DuIN was updated on October 24, 2026 and SmartFasting on October 28, 2026.

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