Comparison

NightBell vs SleepSafe

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Sleepwalking detection via motion sensors
  • Gentle alarm to wake user
  • Household member alerts
  • Smartwatch task for false alarm prevention
  • Designed for sleepwalker safety
Features
Read full description

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.

About

SleepSafe

This app uses your Apple Watch to detect nightmares and night terrors in real-time, gently guiding you back to sleep with haptic feedback. It also offers sleep analysis, a sleep talking recorder, and insights into stress and anxiety.

Highlights
  • Real-time nightmare detection
  • Gentle haptic interventions
  • Sleep talking recorder
  • Comprehensive sleep analysis
  • Personalized sleep score
  • Stress & anxiety insights
Features
Read full description

Wake up calmer. SleepSafe is the only Apple Watch app that detects nightmares, night terrors, and sleepwalking as they happen — then gently guides you back to peaceful sleep with subtle taps, before the episode escalates. Built for people living with PTSD, anxiety, restless sleep, and recurring bad dreams, SleepSafe watches over you all night so you can finally rest. KEY FEATURES - Real-Time Nightmare Detection: On-device machine learning reads Apple Watch heart rate and motion sensors up to 4x per second to catch nightmares the moment they begin - Night Terror Protection: Detects sudden heart-rate spikes and intervenes instantly to stop night terrors before they take hold - Gentle Haptic Interventions: Soft, escalating Apple Watch taps ease you out of a nightmare without jarring you awake - Wake-Me-Up Mode: Optional stronger haptics fully wake you when a severe nightmare or night terror is detected - Sleep Talking Recorder: Captures and transcribes sleep talking, sounds, and movement overnight, stored securely on-device for complete privacy - Comprehensive Sleep Analysis: Track sleep stages (REM, Core, Deep), duration, and quality to understand your night and sleep better - Personalized Sleep Score: See your sleep improve over time with nightly performance tracking - Stress & Anxiety Insights: Physiological trends reveal what may be disrupting your sleep - Sleep Trends Dashboard: Real-time sleep debt and history in one clear, intuitive view - Fully Customizable: Toggle every feature to fit your needs — anxiety, restless legs, night terrors, or PTSD nightmares YOUR PRIVACY COMES FIRST All audio recording and machine-learning analysis happen entirely on your device. Your most personal moments never leave your Apple Watch and iPhone. Stay calm, collected, and safe through the night — and finally sleep better. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

NightBell3 screens
SleepSafe4 screens

Verdict

The call

The clearest difference is rating: NightBell at 5.0 against SleepSafe's 4.5. NightBell also leads on in-app purchases (none vs 2). SleepSafe's advantage is ratings volume (12 vs 3). On price, review sentiment, update cadence and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SleepSafe sells 2 in-app purchases, starting at $6.99 per month. NightBell asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NightBell holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

NightBell ships an update every 11 days, SleepSafe every 2 weeks. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

Scorecard4 real differences · 6 level
NightBell versus SleepSafe: the parameters behind the verdict, then further details
ParameterNightBellSleepSafe
PriceFreeFree
Rating5.0 (3 ratings) — better4.5 (12 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings312 — better
Update frequencyEvery 11 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, Apple WatchiPhone, Apple Watch
Requires iOS16.0 — better17.0
Further details — not scored
Size4 MB58 MB
Age rating4+4+
DeveloperIrina DeevaOliver Lerstøl Hebnes

Customer experience

NightBell

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SleepSafe

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

NightBell

No in-app purchases

2 purchases

SleepSafe

Subscriptions2
  • Monthly Premium7 Days trial$6.991 Month
  • Yearly Premium$44.991 Year

Questions

Is NightBell free?
NightBell is free to download, with no in-app purchases.
Is SleepSafe free?
SleepSafe is free to download, with in-app purchases available.
Which has better reviews, NightBell or SleepSafe?
NightBell is rated higher. NightBell averages 5.0 out of 5 from 3 ratings, while SleepSafe averages 4.5 from 12 ratings.
Do NightBell or SleepSafe have ads?
Neither NightBell nor SleepSafe shows ads.
Which is updated more often, NightBell or SleepSafe?
NightBell ships an update every 11 days, and SleepSafe every 2 weeks. Most recently, NightBell was updated on November 3, 2026 and SleepSafe on November 7, 2026.

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