Fat Burned vs Just Steps
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fat Burned
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Ever wonder how much fat you actually burn in a day? FatBurn turns your Apple Health data into clear, actionable fat burn estimates — no guesswork, no calorie counting, no manual logging. Just open the app and see how much fat your body has burned today, during workouts, this week, and over your entire fitness history. HOW IT WORKS FatBurn uses established exercise physiology research to estimate fat oxidation from data already on your iPhone and Apple Watch: Heart rate samples from workouts and throughout the day Your age, weight, and biological sex from Health Workout duration, and intensity Calories are estimated using the Keytel formula (Keytel et al., British Journal of Sports Medicine, 2005). Fat burn is then calculated based on heart rate zone analysis — your body burns a higher percentage of fat at lower intensities and shifts toward carbohydrates at higher intensities. FatBurn classifies your effort into low, moderate, and vigorous zones and applies research-backed fat oxidation percentages to each. WHAT YOU SEE Daily Fat Burn — total fat burned from all activity and resting metabolism Workout Fat Burn — fat burned specifically during recorded workouts Weekly Trends — a 7-day chart showing daily fat burn with weekly totals Workout Breakdown — individual workout cards with fat burn, duration, and calories Lifetime Total — cumulative fat burned from your earliest HealthKit record Customizable Goals — set daily, workout, and weekly fat burn targets based on CDC and AHA guidelines All values display in grams or ounces, with support for kilograms and pounds for larger totals. APPLE WATCH APP FatBurn includes a full Apple Watch companion app so you can check your fat burn stats right from your wrist: Daily and workout fat burn at a glance Active calories, workout minutes, and weekly totals Syncs automatically with your iPhone via HealthKit Designed for quick, on-the-go reference WATCH COMPLICATIONS Add FatBurn to your watch face for instant access. Complications are available in multiple styles and sizes, showing your choice of: Daily Fat Burn Workout Fat Burn Weekly Fat Burn Choose which metric appears on your watch face from the watch app on your iPhone. Complications update throughout the day with HealthKit background delivery. THE SCIENCE FatBurn doesn't just make up numbers. Every calculation is grounded in peer-reviewed research: Keytel Formula for calorie estimation from heart rate (J Sports Sci, 2005) Achten & Jeukendrup's Maximal Fat Oxidation research (Int J Sports Med, 2003) CDC weight loss guidelines (0.5–1.0 kg/week safe range) AHA physical activity recommendations (150 min/week moderate exercise) Full methodology with formulas and citations is available inside the app under Settings. PRIVACY FIRST Your health data stays on your device. Period. FatBurn reads data only from Apple HealthKit on your iPhone and Apple Watch No data is uploaded to any server — all processing happens locally No accounts, no sign-ups, no tracking No third-party analytics or advertising SDKs We cannot see your health data, and we never will FatBurn requires HealthKit access to function. You control exactly which data types you share through the standard iOS Health permissions screen. SUBSCRIPTION FatBurn offers a 1-week free trial with full access to all features. After the trial, continue using FatBurn for $4.99/year. No features are locked — the subscription simply lets you keep using the app you already enjoy. 1-week free trial $4.99/year after trial (price may vary by region) Cancel anytime — no charge if you cancel during the trial Manage or cancel from Settings > Apple ID > Subscriptions DISCLAIMER FatBurn provides estimates based on published exercise physiology formulas. This app is not intended to provide medical advice. Consult a healthcare professional before making health decisions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Just Steps
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JustSteps — the simple step tracker without distractions JustSteps is the step tracker for people who want to move more — without the clutter of a bloated fitness app. Open the app, see your steps. That’s it. Focused on what matters JustSteps shows you exactly what counts: your steps today, the distance you’ve walked, and your progress toward your daily goal. No feeds, no challenges, no gimmicks — just the numbers that keep you on track. Reliable in the background Using your iPhone’s motion sensor and HealthKit, JustSteps tracks your steps throughout the day — even when the app is closed. Hit your goal? You’ll get notified instantly. Quiet, but effective Set your daily goal, choose your reminders — and let the app do the rest. JustSteps works in the background and only speaks up when it really matters. Your progress at a glance Track your steps month by month. With a clear 7-day overview, you can spot trends instantly. All data syncs with HealthKit and integrates seamlessly with Apple Health. Home & Lock Screen widgets Keep your progress visible — without opening the app. Choose from multiple widget sizes, including a circular gauge for quick updates.
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Verdict
The clearest difference is iOS requirement: Just Steps at 17.0 against Fat Burned's 26.1. On price, ads, in-app purchases 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. Fat Burned sells 1 in-app purchase, starting at $4.99 per year and Just Steps sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
| Parameter | Fat Burned | Just Steps |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | — | Every 11 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 26.1 | 17.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 24 MB |
| Age rating | 17+ | 4+ |
| Developer | ReliPR, LLC | Bennet Freigang |
In-app purchases
Fat Burned
- Fat Burned Pro7 Days trial$4.991 Year
Just Steps
- 7-day TrialFree
- JustSteps Pro Lifetime$3.99









