SleepSync vs Lung
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SleepSync
Optimize your sleep cycles to wake up feeling refreshed. This app calculates your ideal bedtime and wake-up time based on sleep science, offering insights into deep sleep and REM stages. Enjoy a user-friendly interface designed for a better night's rest.
- Personalized sleep schedule
- Deep sleep and REM analysis
- Intuitive sleep calculator
- Advanced sleep cycle tracking
- User-friendly interface
- Privacy focused
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Wake up feeling refreshed and rejuvenated every morning with SleepSync, your personal sleep calculator and bedtime scheduler. Designed to enhance your sleep quality by optimizing your sleep cycles, SleepSync ensures you fall asleep and wake up at the perfect times for maximum restfulness. Why SleepSync? Personalized Sleep Schedule: Discover your ideal bedtime and wake-up time based on scientific sleep cycle analysis, tailored specifically to your lifestyle. Deep Sleep and REM Analysis: Dive deep into your sleep patterns with advanced tracking of your deep sleep and REM cycles, enabling targeted improvements to your sleep quality. Features: Intuitive Sleep Calculator: Simply input your desired wake-up time to calculate the best times to go to sleep. Advanced Sleep Cycle Tracking: Leverage the power of sleep science to analyze your sleep phases and adjust your bedtime for optimal rest. User-Friendly Interface: Enjoy a seamless experience with SleepSync's elegant and easy-to-navigate design. Privacy First: Your sleep data belongs to you. SleepSync ensures your information is secure and never shared. Whether you're looking to improve your sleep quality, wake up more refreshed, or simply find the best time to go to bed, SleepSync is here to transform your nights and mornings. Start your journey towards better sleep and a more energetic day with SleepSync.
Lung
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LUNG: Your pocket breathing app for instant calm. Stressed? Anxious? Can’t sleep? LUNG helps you breathe like a pro in seconds. Unlock breathing hacks loved by doctors and backed by science: • Box Breathing (1-1-1-1) – inhale, hold, exhale, hold – all the same length. The classic for instant clarity and nerves of steel. Perfect when you're feeling like a jittery squirrel on caffeine. • Calm (4-2-4) – 4 seconds in, 2 hold, 4 out. Gentle calm-down mode when you need to chill fast without breaking a sweat. • Relax (4-7-8) – 4 in, 7 hold, 8 out. Dr. Weil's famous sleep hack. Works so well, folks often nod off before they even hit the 7-second count. • Simple (1-1) – even in and out breaths. The no-brainer for on-the-go or when your mind's doing loop-de-loops. • Unwind / Deep Calm (1-2) – inhale for 1 part, exhale for 2. The quickest way to kick your chill mode into gear. Double exhale = double the relaxation vibes. Great for just "blowing away" that stress. • Meditation – a no-fuss timer for zen sessions from 1 to 60 minutes, ending with a gentle "time's up!" nudge. Say goodbye to those sneaky "just five more minutes" traps. Quickly lower stress, slow your heart rate and clear your mind. Features • Beautiful glowing visual guide • Haptic feedback – breathe with eyes closed • Focus Mode - pure animation, no disturbance • High-quality relaxing sounds • 100% private – no ads, no tracking, no account Perfect for panic attacks, falling asleep faster, focus & daily stress relief. Breathe deeper. Stress less. Exhale the chaos!
Screenshots
Verdict
The clearest difference is ads: Lung at none against SleepSync's shown. On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | SleepSync | Lung |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | — | Every 3 days |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | APPS BAY LIMITED | Robert Lenart |
In-app purchases
SleepSync
No in-app purchases
Lung
No in-app purchases









