Rem vs NightBell
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rem
This app automatically tracks your sleep cycles using your Apple Watch, providing detailed analysis of your sleep patterns. It offers insights into sleep quality, disruptions, and heart rate, helping you understand and improve your rest.
- Automatic sleep tracking
- Sleep pattern analysis
- Snore detection
- Sleep score and breakdown
- Heart rate analysis
- Smart alarm clock
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Unlock the secrets of a good night's sleep with Rem, the smart autosleep tracker. With its advanced AI-Machine Learning technology, Rem provides an in-depth analysis of your sleep patterns and helps you understand the impact of your habits and routines on your sleep quality. Get ready to say goodbye to restless nights and hello to sweet dreams with Rem. = Key Features = — Completely Automatic and Easy to use — Sleep Pattern Diagram (Rem stage included) — Snore Detection — Sleep Score — Score Breakdown — Heart Rate Analysis (Dip and Detail Diagram) — Sleep Regularity — Time to Sleep — Trends — Nap Detection — Sleep History — Sleep Assessment — Smart Alarm Clock — Low Battery Usage — Compatible with All Available Apple Watch Versions ============= HOW REM WORKS: • All you need to do is wear your Apple Watch to bed. • An iwatch sleep tracker, facilitates the AI-Machine Learning algorithm to analyze sleep cycle. • Moving more or less than others, Rem adjusts automatically to your personal data • We ignore sleep sessions that are less than 1 hour. To enable snore detection: 1. Connect your iPhone to a power source 2. Tap the "Start Tracking" button 3. Optionally, set a gentle alarm to wake you up. — EASY TO USE — Just wear your Apple watch before bedtime and check your sleep log after you wake up. Your shut eye report is displayed in a clear and understandable way. — SLEEP PATTERN DIAGRAM — Understand your sleep cycles with simple graphs. Discover how to get the restful and restorative sleep you deserve! You can find out the exact times you’ve been disrupted, as well as easily learn the total amount of deep, light, and REM phases. — SNORE Detection — You can identify if snoring is affecting your sleep quality and take necessary actions to improve it. Rem is also equipped with environment sound detection, so you can monitor the ambient noise levels and make adjustments for a more comfortable sleeping environment. — SLEEP SCORE — Your Sleep Score is displayed clearly with a number 0-100 which is an accurate interpretation of your rest quality. — SCORE BREAKDOWN — REM App highlights the most relevant data of your sleep: • Time Asleep • Sleep Details » The total minutes of your deep and REM phases, the most restorative phase of your sleep • Heart Rate » Your heart rate analysis is key for measuring your shut eye quality. You can view your sleeping heart rate graph, your average sleeping heart rate, and the dip percentage of your heart rate during sleep • Disruption • Regularity » REM app records your sleep rhythm automatically and will demonstrate your sleep consistency in a user-friendly diagram. • Time To Sleep • Respiratory Rate » The number of times you breathe in a minute during sleep • Blood Oxygen » The level of blood oxygen during sleep — TRENDS — Follow the impact of your routines on your sleep quality with help of trend diagrams. — SLEEP HISTORY — Monitor your previous sleep diagrams and compare them to your latest data. — NAP DETECTION — REM is an auto nap tracker and will show the nap sessions in a separate field. — SLEEP ASSESSMENT — Learn more about healthy sleep practices by taking the assessment and set yourself up for better sleep. — SMART ALARM — Wake up refreshed and ready for the day. Our smart alarm clock gently eases you out of deep sleep. To use this feature, watchOS 6 or higher is required. — LOW BATTERY USAGE — Don’t worry about draining your battery because it’s low battery usage, even less than your usual usage of Watch. Charge your watch during the day or before sleep. Make sure it has at least a %30 charge. Rem is for anybody who struggles with insomnia or sleep apnea. With the power of its sleep tracking algorithm, you can find accurate and valuable insight about your sleep. Set the smart alarm before bed time and rise refreshed and on-time. It’s a simple-to-use sleep recorder, no need to put it under your pillow. Terms and Privacy Policy: https://bettersleeapapp.com/rem/terms.html
NightBell
This app monitors for sleepwalking episodes using motion sensors. It triggers a gentle alarm to wake you and can alert household members. A unique task-based system on a smartwatch helps differentiate between sleepwalking and being awake to prevent false alarms.
- Sleepwalking detection via motion sensors
- Gentle alarm to wake user
- Household member alerts
- Smartwatch task for false alarm prevention
- Designed for sleepwalker safety
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NightBell is an app developed to meet sleepwalker needs. It’s designed to keep you safe by triggering an alarm, gently waking you up, and alerting your household members, if you start sleepwalking. Key Features: 1. Sleepwalking Detection: NightBell uses motion sensors to detect sleepwalking episodes and triggers an alarm to wake you up. 2. Gentle Alarm: The app wakes you up gently, minimizing disruption while ensuring you are aware of your sleepwalking. 3. Prevention of false alarms: If NightBell detects walking when the session is active, it will ask the user to perform a simple Task on the Apple Watch to understand if he’s awake or sleepwalking. Download NightBell now and experience the peace of mind that comes with knowing you'll be alerted if sleepwalking occurs. Sleep tight and let NightBell watch over your slumber.
Screenshots
Verdict
The clearest difference is review sentiment: NightBell at 100% against Rem's 38%. NightBell also leads on rating (5.0 vs 4.2) and in-app purchases (none vs 8). Rem's advantage is ratings volume (2.7K vs 3). On price, ads, 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. Rem sells 8 in-app purchases, starting at $4.99 per month. NightBell asks for nothing beyond the download.
NightBell holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Rem has 2.7K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 38% of Rem's written reviews are positive against 100% of NightBell's.
Rem ships an update every 6 weeks, NightBell every 11 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | Rem | NightBell |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (2.7K ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 37.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 2.7K — better | 3 |
| Update frequency | Every 6 weeks | Every 11 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 102 MB | 4 MB |
| Age rating | 12+ | 4+ |
| Developer | WELLBEINE TECHNOLOGIES INC | Irina Deeva |
Customer experience
Rem
NightBell
Bugs and requests
Rem
Reported bugs
3 issues- App crashes or freezes
- Disconnection issues with Apple Watch
- Lack of customer support responsiveness
Requested features
5 requests- Historical sleep data and trends
- Ability to edit sleep times
- Improved smart alarm functionality
- Better integration with Apple Health
- More customization options
NightBell
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Rem
- Monthly Subscription7 Days trial$4.991 Month
- 3 Month Subscription7 Days trial$19.493 Months
- 6 Month Subscription7 Days trial$25.996 Months
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- Yearly Subscription7 Days trial$29.991 Year
- Yearly Subscription$29.991 Year
- Rem Premium7 Days trial$29.991 Year
- Yearly Subscription7 Days trial$59.991 Year
- Lifetime Subscription$49.99
NightBell
No in-app purchases








