REM Sleep Tracker vs I Ching
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
REM Sleep Tracker
This app analyzes Apple Watch sensor data to provide a sleep quality score. It offers detailed insights into sleep stages, heart rate, and weekly trends, helping users understand and improve their rest habits.
- Sleep quality scoring
- Detailed sleep stage analysis (light, deep, REM)
- Heart rate monitoring
- Weekly trend tracking
- Sleep bank concept for habit analysis
- Apple Health integration
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Sleep Monitor is the perfect app for people eager to enhance the quality of their nighttime rest. Thanks to an advanced algorithm, Sleep Monitor processes the data gathered by your Apple Watch sensors to provide you with an overall score representing the quality of your sleep. This innovative app offers a detailed analysis of the different sleep stages, monitoring light, deep, and REM sleep cycles, and providing information about your heart rate throughout the night. Additionally, Sleep Monitor allows you to track your progress with the "sleep bank" concept, a repository of your rest data that helps you better understand your habits and identify any issues. With Sleep Monitor, you can also monitor the weekly trends of various parameters, such as sleep duration, rest quality, and time spent in each sleep stage. This valuable information will enable you to make targeted lifestyle changes to improve your nighttime rest. Don't miss the opportunity to transform your Apple Watch into a powerful tool for better sleep and waking up more rejuvenated each day. Sleep Monitor is the ideal app for those seeking an ally in sleep management, with an intuitive design and a rich array of features. Download Sleep Monitor today and begin your journey towards more restful and regenerative sleep. Maximize the potential of your Apple Watch and discover how quality rest can improve your daily life! HealthKit Integrated with Apple Health for sleep stages, heart rate, respiratory frequency, age and gender data to calculate sleep quality. Sleep Monitor Premium Sleep Monitor offers a Premium version available as an auto-renewable subscription. Payment will be charged to iTunes Account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period at the rate of your selected plan above. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings on the device. Once purchased, refunds will not be provided for any unused portion of the term. Privacy policy: http://app.sleepscoreapp.com/Home/Privacy Terms of use: http://app.sleepscoreapp.com/Home/Terms
I Ching
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A calm, contemporary I Ching practice for clearer questions and more thoughtful responses to change. I Ching: Psychè brings the Book of Changes into daily life through guided readings, reflective interpretation, weekly patterns, and a personal journal. It does not claim to predict the future. Instead, it helps you pause, recognise the shape of a situation, and consider how you might respond. Traditional source material and contemporary additions are identified separately. The optional psychological layer is informed by a psychiatrist’s perspective and is designed to support reflection, not diagnosis or treatment. DAILY COMPASS Begin with one quiet question and draw a hexagram for the day. Explore its symbolic pattern through clear guidance, a practical exercise, and a concise psychological balance. Your first Daily Compass is free each day and remains available whenever you want to return to it. ORIGINAL READING Cast six lines and receive a complete reading shaped around your question. Traditional source material, structural interpretation, contemporary synthesis, and optional psychological reflection are presented as distinct layers, so their different roles remain clear. One Original Reading is free each week, with additional readings available through credits. WEEKLY REFLECTION See the patterns that emerge across your Daily Compass practice. Weekly Reflection preserves your notes, lets you revisit the psychological balance from each completed day, links directly to your unlocked cards, and offers one question to carry into the coming week. JOURNAL AND PERSONAL REFLECTION Original Readings are saved automatically with their date, question, hexagram, changing lines, and full result. Add an optional reflection and return to any entry when a new perspective emerges. EXPLORE ALL 64 HEXAGRAMS Unlock collectible cards through Daily Compass and Original Reading. Explore all 64 hexagrams across eight elemental families: Heaven, Earth, Water, Fire, Lake, Mountain, Wind, and Thunder. Reveal illustrated family card backs and haiku, complete focused achievements, and let your Library become a visual record of your practice. LEARN THE METHOD The in-app guide introduces lines, trigrams, hexagrams, the traditional consultation method, textual references, and the app’s contemporary reflective approach. Source material and later adaptation are identified separately. AVAILABLE IN SEVEN LANGUAGES Use the app in English, Italian, Simplified Chinese, Japanese, Spanish, French, or German. Choose a language on first launch and change it at any time in Settings. AT YOUR OWN PACE • One free Daily Compass each day • One free Original Reading each week • Additional readings through optional credits • Traditional and contemporary interpretive layers kept distinct • Weekly notes, patterns, and psychological thread • Personal notes saved automatically • A dated Journal with complete readings • 64 collectible hexagram cards • Eight illustrated family card backs with haiku • Focused achievements and collection progress • Optional reminders • No account required Whether you already know the I Ching or are approaching it for the first time, I Ching: Psychè offers a considered way to slow down, ask better questions, and meet change with curiosity. I Ching: Psychè is intended for reflection and education. It does not provide predictions and is not a substitute for medical, psychological, legal, or financial advice.
Screenshots
Verdict
The clearest difference is update cadence: I Ching at daily against REM Sleep Tracker's every 2 weeks. REM Sleep Tracker's advantage is iOS requirement (16.0 vs 18.6). 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. REM Sleep Tracker sells 2 in-app purchases, starting at $9.99 per year and I Ching sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
REM Sleep Tracker ships an update every 2 weeks, I Ching daily. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.
| Parameter | REM Sleep Tracker | I Ching |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (49 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 49 — better | — |
| Update frequency | Every 2 weeks | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 25 MB | 196 MB |
| Age rating | 4+ | 4+ |
| Developer | Nicola Eusebi | Giulio Ginesi |
In-app purchases
REM Sleep Tracker
- Sleep Score Premium Yearly$9.991 Year
- Sleep Score Premium Yearly7 Days trial$29.991 Year
I Ching
- One Credit$0.99
- Five Coins$0.99
- Ten Coins$1.99
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- Thirty Coins$2.99
- Unlimited Castings$4.99
Questions
Is REM Sleep Tracker free?
Is I Ching free?
Do REM Sleep Tracker or I Ching have ads?
Which is updated more often, REM Sleep Tracker or I Ching?
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