Stacking vs KarmaSync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stacking
This app helps you understand your long-term running progress and consistency. Visualize your workouts with trend charts and activity grids, set personalized goals, and gain insights into your performance. It integrates with Apple Health to track various metrics and offers customization options for your training preferences.
- Trend charts for long-term progress
- Activity grids for workout history
- Heart rate zone analysis
- Personalized fitness goal setting
- Progress tracking for multiple activities
- Insights and comparisons
- Apple Health integration
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Your Apple Watch tracks every run. But are you actually getting better? Stacking is your running companion for the long run. Understand your long-term progress, set goals that match how you train, and master the consistency that makes you a better runner. Your Workouts, Visualized - Trend Charts - Track your running progress over weeks, months, and years with clear visual comparisons - Activity Grids - See your workout history at a glance with intuitive calendar views for the week, month, and year - Heart Rate Zone Analysis - Understand the intensity of every workout with detailed 5-zone breakdowns using the proven Heart Rate Reserve method - Explore detailed run data & charts - Filter your past workouts and view detailed data for your runs, which includes effort insights, heart rate data, pace, grade adjusted pace, splits and more. Set Goals That Stick Create personalized fitness goals that match how you actually train: - Frequency - "Run 3 times a week" - Duration - "Exercise for 150 minutes a week" - Distance - "Cycle 100 km a month" - Elevation - "Gain 5,000 m this year" Track progress for any activity: running, cycling, swimming, strength training, yoga, HIIT, and more. Set weekly, monthly, or yearly targets and watch your progress build. Insights That Matter - Compare this week to last week, this month to last month, this year to last year - Filter by activity type to focus on what matters to you - Track total time, distance, and elevation gained across all your workouts - Track Resting Heart Rate, HRV, VO2 Max, Active Energy, and Cardio Recovery with clear 3-year trends from Apple Health Upgrade to Stacking Pro - Monitor your heart rate zones over time - Compare your easy pace week-to-week improvements - View your Yearly Activity progress - and more! Built for Your Preferences - Customize heart rate zones to match your training - Choose your units: kilometers or miles, meters or feet - Set your week to start on Monday or Sunday Privacy First Stacking reads directly from Apple Health. Your data stays on your device where it belongs. --- Stack your runs. Track your trends. See your progress. For terms of service: https://stackingapp.net/terms
KarmaSync
Analyzes Apple Health data to provide a daily score reflecting activity, sleep, and heart metrics. Offers insights, personalized goals, and motivational tips to help build healthier habits.
- Daily Karma Score
- Streaks and Levels
- Vitals Dashboard
- Body Tracking
- Sleep & Activity Insights
- Personalized Goals
- Daily Motivation
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KarmaSync — Your Daily Health Score Turn your Apple Health data into one simple number. KarmaSync analyzes your daily activity, sleep, and heart metrics to generate a daily Karma Score (0–100) that helps you understand how your day is going at a glance. How it works Your Karma Score is calculated using your Apple Health data and your personal goals: • Steps (60%) • Active Energy (15%) • HRV & Resting Heart Rate (10%) • Sleep (15%) If some data is unavailable, the remaining metrics are automatically rebalanced — you are never penalized for missing sensors. Features • Daily Karma Score — Instantly see how your day compares to your goals • Streaks — Build consistency by maintaining a score of 60+ • Levels & Progression — Earn lifetime Karma and unlock new levels • Vitals Dashboard — View steps, calories, HRV, distance, flights climbed, and exercise minutes • Body Tracking — Track and visualize your weight over time • Sleep & Activity Insights — Understand how rest and movement affect your score • Personalized Goals — Customize targets for steps, calories, sleep, heart rate, and exercise • Daily Motivation — Get simple tips based on your current progress Privacy First Your health data stays on your device. KarmaSync does not require an account and does not upload your health data to external servers. Requirements • iPhone with Apple Health • Apple Watch recommended for HRV, heart rate, sleep, and exercise tracking Start your day with clarity and build better health habits with KarmaSync. Medical Disclaimer KarmaSync: Health Dashboard is intended for informational and wellness purposes only. The app is not a medical device and does not provide medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare professional before making any medical decisions or changes related to your health.
Screenshots
Verdict
The clearest difference is price: Stacking at Free against KarmaSync's $9.99. Stacking also leads on rating (5.0 vs 4.5) and review sentiment (100% vs 83%). KarmaSync's advantage is in-app purchases (none vs 3) and ratings volume (15 vs 1). On 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
Stacking is free to download; KarmaSync costs $9.99 up front. Stacking sells 3 in-app purchases, starting at $4.99 per month. KarmaSync asks for nothing beyond the download.
Stacking holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: KarmaSync has 15 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Stacking's written reviews are positive against 83% of KarmaSync's.
| Parameter | Stacking | KarmaSync |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 5.0 (1 ratings) — better | 4.5 (15 ratings) |
| Positive reviews | 100.0% of reviews — better | 83.3% of reviews |
| Number of ratings | 1 | 15 — better |
| Update frequency | Every 2 weeks | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.4 | 14.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Jeremiah Daneil de la Rouviere | Ali Alrabei |
Customer experience
Stacking
KarmaSync
In-app purchases
Stacking
- Stacking Pro - Monthly$4.991 Month
- Stacking Pro - 14-day accessFree
- Stacking Pro - Lifetime Access$19.99
KarmaSync
No in-app purchases









