Uncross vs Rolling Heart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Uncross
This app helps you break the habit of crossing your legs, a common cause of poor posture. It uses your Apple Watch to monitor movement and send gentle reminders, allowing you to track your progress and build better sitting habits over time.
- Apple Watch motion detection
- Gentle, randomized reminders
- Daily sitting habit dashboard
- Streak tracking for motivation
- Weekly and monthly progress charts
- Customizable quiet hours
- Watch face complication for streak visibility
- Data export to CSV
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Uncross helps you become aware of and break the habit of crossing your legs while sitting — a common cause of poor posture and discomfort. Wear your Apple Watch. Start a session. Uncross quietly monitors your movement and sends gentle reminders asking if you're crossing your legs. Confirm or deny with a tap. Over time, you'll see your patterns clearly and naturally sit better. FEATURES • Apple Watch detection — motion-aware session tracking right from your wrist • Gentle nudges — randomized reminders so you stay aware without feeling nagged • Daily dashboard — sitting time, crossing estimates, and a confirmation rate score • Streak tracking — build momentum with consecutive improvement days • Weekly & monthly trends — charts that show your progress over time • Quiet hours — set a schedule so reminders only appear when you want them • Watch complication — your streak count always visible on your watch face • CSV export — take your data anywhere • Privacy first — everything stays on your device, nothing is ever uploaded HOW IT WORKS 1. Open the Watch app and start a sitting session 2. Uncross monitors your movement and pings you at random intervals 3. Tap to confirm or deny whether you're crossing your legs 4. Check your iPhone dashboard to review your day Small habit. Big difference. https://purrfect-allium-817.notion.site/Privacy-Policy-34361c6829748069b526f9bc49dc9b35
Rolling Heart
Track your heart rate and wellness patterns with glanceable views on iPhone and Apple Watch. Explore Heart Flow, Heart Load, and Recovery Reserve with personalized ranges and customizable graphs. Offers both free and premium features for detailed health insights.
- Glanceable heart rate views
- Heart Flow and Heart Load tracking
- Personalized heart rate ranges
- Customizable graph appearance
- Apple Watch complications
- Offline Rolling Heart Guide
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Your heart rate, rolling with you. Rolling Heart brings private Heart Flow context and factual Heart Data to iPhone and Apple Watch in calm, glanceable views for everyday wellness. SEE THE SHAPE OF YOUR DAY Dashboard gives you a quick view of Heart Flow. Heart Lens lets you explore recent patterns and the context behind them, including Heart Load, Movement Load, Recovery Reserve and Sleep Support. Heart Data keeps recorded values, timestamps and availability separate from these derived wellness views. MAKE HEART FLOW MORE PERSONAL Personal Ranges reviews 84 days of history privately on your iPhone when enough data is available. Compare Flexible and Standard styles, preview how your days look, then apply your choice or keep your current ranges. You decide when to review and what to apply. Optional review reminders help you return when you are ready. EXPLORE YOUR GRAPHS Browse available history, choose a date and inspect readings in the Heart Flow Graph preview. Lifetime Premium lets you customize graph shape and colors, choose Classic or Smooth Feather fills, soften the graph, and add Time Markers. Preview your changes before applying them. HEART FLOW ON YOUR WRIST Watch Today builds Heart Flow locally on Apple Watch. Heart Flow complications offer Flow, Heart Rate and Hybrid trace choices. Supported complications can show minimum and maximum readings for the graph range, since midnight or since noon. Explore factual Heart Rate, HRV, Resting Heart Rate, Blood Oxygen, Day's Vitals and Rolling Vitals complications across supported families. Browse every complication preview for free and discover nine ready-made faces in the iPhone Watch Face Gallery. Adding a face requires a compatible paired Apple Watch. USEFUL FROM THE START The free app includes six-hour Dashboard, Heart Lens, Heart Data, Watch Today and Heart Flow complication views; Personal Ranges on Everyday; supported factual complication families; graph preview and inspection; Heart Flow Lab comparisons; the offline Rolling Heart Guide; and three ready-made Watch faces. Sandstone and System, Light and Dark appearance are free. GO FURTHER WITH LIFETIME PREMIUM One optional, one-time purchase on iPhone or Apple Watch adds longer ranges, Parchment, Signal and Electric themes, graph and Advanced Lab customization, Body Response and Sleep Focus profiles, expanded Heart Rate complication options, four Signal Orbit complications and six additional ready-made Watch faces. Purchase and Restore Purchases are available on either device, with private paired-device ownership sharing. PRIVATE BY DESIGN Apple Health access is permission-based. Heart rate is the only required Heart Flow input; available age, recovery, movement, workouts, sleep, breathing, oxygen and sleeping wrist-temperature context add detail. Missing optional inputs are reweighted or treated as neutral. Date of Birth is used locally for an age-predicted maximum-heart-rate model and sleep-duration guidance; the actual birth date is excluded from Heart Flow caches and paired messages. Sleeping wrist temperature adds limited context relative to your own history. Health data stays on your devices. Rolling Heart has no account, ads, analytics, tracking or developer server. Only limited data and settings needed for paired features move privately between your iPhone and Apple Watch; the Watch builds its own Heart Flow. Optional comparison with your paired iPhone returns aggregate differences. No Health data is uploaded to the developer automatically, and the app does not write Health data. Rolling Heart is for personal wellness visualization only. It is not intended for diagnosis, treatment, monitoring, regulated medical-device use or emergencies.
Screenshots
Verdict
The clearest difference is rating: Uncross at 5.0 against Rolling Heart's 3.0. Uncross also leads on in-app purchases (none vs 1). On price, ratings volume, 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. Rolling Heart sells 1 one-off in-app purchase. Uncross asks for nothing beyond the download.
Uncross holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
| Parameter | Uncross | Rolling Heart |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | — | Every 5 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 97 MB |
| Age rating | 4+ | 4+ |
| Developer | Jae Hyun Song | BRENT ANDREW CHUA |
Customer experience
Uncross
Rolling Heart
In-app purchases
Uncross
No in-app purchases
Rolling Heart
- Rolling Heart Lifetime Premium$7.99









