Comparison

SleepSafe vs Stress Tracker HRV

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

Head to head
About

SleepSafe

This app uses your Apple Watch to detect and gently interrupt nightmares, sleepwalking, and night terrors. It offers features like sleep talking recording, personalized sleep analysis, and stress monitoring to help you achieve calmer, more restful sleep.

Highlights
  • Real-time nightmare detection
  • Sleep talking recorder
  • Gentle haptic interventions
  • Night terror protection
  • Comprehensive sleep analysis
  • Stress & anxiety monitoring
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/

About

Stress Tracker HRV

Monitor your body's stress levels, sleep quality, and recovery using Heart Rate Variability (HRV) data from your Apple Watch. Gain insights into your mental and physical well-being to make informed decisions about rest and activity.

Highlights
  • Real-time stress tracking via HRV
  • Daily and weekly stress trend analysis
  • Recovery Index for bounce-back assessment
  • Sleep score and optimization insights
  • On-device data privacy
Features
Read full description

Stress tracking with HRV, sleep insights & recovery in one simple app. Feel tired, anxious, or burned out without knowing why? This app gives you answers, not guesses. Stress Tracker uses Heart Rate Variability (HRV) to show your real stress level, sleep quality, and how well you’re recovering — all from your Apple Watch. Track your daily stress instantly. See how it changes across the day or week. Know when to rest, recover, or push forward with data-backed clarity. Features: • Real‑time stress tracking based on HRV • Daily & weekly stress trends • Recovery Index to see how you bounce back • Sleep score and insights to optimize rest • Fully private – nothing leaves your device Get clarity over your mental and physical health. Stop guessing. Start tracking.

Screenshots

SleepSafe4 screens

Verdict

The call

The clearest difference is price: SleepSafe at Free against Stress Tracker HRV's $7.99. SleepSafe also leads on update cadence (every 2 weeks vs every 5 weeks) and ratings volume (11 vs 2). Stress Tracker HRV's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 2). On review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

SleepSafe is free to download; Stress Tracker HRV costs $7.99 up front. SleepSafe sells 2 in-app purchases, starting at $6.99 per month. Stress Tracker HRV asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Stress Tracker HRV holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: SleepSafe has 11 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

SleepSafe ships an update every 2 weeks, Stress Tracker HRV every 5 weeks. The most recent releases landed on October 25, 2026 and October 6, 2026 respectively.

Scorecard7 real differences · 3 level
SleepSafe versus Stress Tracker HRV: the parameters behind the verdict, then further details
ParameterSleepSafeStress Tracker HRV
PriceFree — better$7.99
Rating4.5 (11 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings11 — better2
Update frequencyEvery 2 weeks — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium — betterPaid
DevicesiPhone, Apple WatchiPhone, iPod, Apple Watch — better
Requires iOS17.013.0 — better
Further details — not scored
Size51 MB5 MB
Age rating4+4+
DeveloperOliver Lerstøl HebnesAlvaro Garcia Pizarro

Customer experience

SleepSafe

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

Stress Tracker HRV

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

SleepSafe

Subscriptions2
  • Monthly Premium7 Days trial$6.991 Month
  • Yearly Premium$44.991 Year
None

Stress Tracker HRV

No in-app purchases

Questions

Is SleepSafe free?
SleepSafe is free to download, with in-app purchases available.
Is Stress Tracker HRV free?
Stress Tracker HRV costs $7.99, with no in-app purchases.
Which has better reviews, SleepSafe or Stress Tracker HRV?
Stress Tracker HRV is rated higher. SleepSafe averages 4.5 out of 5 from 11 ratings, while Stress Tracker HRV averages 5.0 from 2 ratings.
Do SleepSafe or Stress Tracker HRV have ads?
Neither SleepSafe nor Stress Tracker HRV shows ads.
Which is updated more often, SleepSafe or Stress Tracker HRV?
SleepSafe ships an update every 2 weeks, and Stress Tracker HRV every 5 weeks. Most recently, SleepSafe was updated on October 25, 2026 and Stress Tracker HRV on October 6, 2026.

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