Comparison

SleepSpace vs Stealth Performance

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

Head to head
About

SleepSpace

This app helps you fall asleep faster, sleep more deeply, and wake up refreshed with adaptive sounds, smart alarms, and personalized sleep tracking. It functions as a complete sleep system, integrating with your phone, wearables, or smart bedroom devices to strengthen natural sleep rhythms.

Highlights
  • Adaptive sounds for falling asleep
  • Smart alarm for refreshed waking
  • Personalized sleep tracking
  • Integration with wearables and smart devices
  • AI-powered sleep assistant
  • Privacy-first design
Features
Read full description

Sleep tracking tells you what happened. SleepSpace helps you change what happens tonight. Fall asleep with adaptive sound, support deeper sleep through the night, wake during a lighter sleep phase, and understand your recovery with personalized sleep insights. Designed by sleep scientist Dr. Dan Gartenberg, SleepSpace brings together your phone, wearables, and guided sleep programs into one complete sleep system. Built on peer-reviewed research and more than $4M in NIH-funded sleep science. Featured by TED, NPR, CNN, The NYTimes, TIME, Reuters, Human Upgrade, Ben Greenfield Life, Sleep Review, & more. FALL ASLEEP FASTER Wind down with relaxing sounds, guided breathing, meditations, and gentle biofeedback. SleepSpace helps your body transition into sleep with calming bedtime routines. SLEEP DEEPER Use adaptive sound masking and overnight sleep support to reduce disruptions and promote a more stable night. Track sleep stages, snoring, awakenings, recovery, and sleep quality with clear insights. Choose sounds for your goals, including meditations, white noise, nature sounds, dream support, and sound patterns designed to support deeper, more restorative sleep. WAKE UP REFRESHED Wake during a lighter sleep phase with a smart alarm designed to reduce morning brain fog. Use smart sound or Apple Watch vibration to wake gently without disturbing your partner. Start the day with a clearer view of your recovery, alertness, and next best steps. TRACK SLEEP YOUR WAY SleepSpace works with: • Your phone on the nightstand or mattress • Apple Watch sleep tracking informed by peer-reviewed research • Popular wearables such as Oura and WHOOP • SleepSpace Charger and connected sleep devices • A clinically inspired sleep diary based on the consensus sleep diary Your data is unified into one clear sleep, recovery, and alertness view. PERSONALIZED SLEEP PROGRAMS Build a nightly Sleep Journey with sounds, wake windows, and routines tailored to your goals. Follow structured sleep programs inspired by evidence-based behavioral sleep techniques, including cognitive behavioral therapy for insomnia. DAILY ALERTNESS AND GUIDANCE See how your sleep affects daytime energy, focus, and recovery. Get simple daily tasks to support better sleep habits over time. AI-POWERED SLEEP SUPPORT Dr. Snooze™ is your built-in AI sleep assistant, offering tips based on your sleep patterns. When you need extra support, you can also connect with a human coach. PRIVACY-FIRST DESIGN SleepSpace works offline and in airplane mode. Sound is analyzed as decibel levels and is not recorded unless you explicitly enable recording. Your sleep data stays private and secure. SleepSpace is built on HIPAA-compliant backend infrastructure with safeguards for health data, including encryption, access controls, audit logging, and secure data handling practices. IMPORTANT INFORMATION SleepSpace is designed for general wellness and sleep support. It is not intended to diagnose, treat, cure, or prevent any disease or medical condition. Consult a qualified healthcare professional for medical concerns. SleepSpace syncs with Apple Health to measure sleep and sleep-related health data. Support messages are voluntarily shared through Intercom. SUBSCRIPTION PRICING & TERMS SleepSpace includes a 7-day free trial. After the free trial, a subscription is required to continue using premium features. Payment will be charged to your Apple ID account at confirmation of purchase. Your subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours before the end of the current period. You can manage or cancel your subscription in your App Store account settings. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable. Terms: https://sleepspace.com/sleepspace-terms-of-use/ Privacy: https://sleepspace.com/privacy-policies/

About

Stealth Performance

Manage your fitness routine with class booking, schedule management, and workout tracking. Receive real-time updates and personalized notifications to stay motivated and connected with your fitness community. Access exclusive content and instructor profiles to enhance your training.

Highlights
  • Book and manage classes
  • Track workouts
  • Real-time class availability
  • Personalized notifications
  • Fitness community connection
  • Exclusive content access
  • Instructor profiles
Features
Read full description

Stealth Performance’s app makes your fitness journey seamless and effective. Book classes, manage your schedule, and track your workouts—all in one place. Get real-time updates on class availability, receive personalized notifications, and stay connected with your fitness community. Whether you’re into yoga, HIIT, or strength training, the app helps you plan and stay consistent. Access exclusive content, view instructor profiles, and stay on top of your progress with ease. Designed for members who want control, convenience, and motivation at their fingertips. Download the Stealth Performance app and take your fitness experience to the next level—wherever you are.

Screenshots

SleepSpace4 screens
Stealth Performance4 screens

Verdict

The call

The clearest difference is rating: Stealth Performance at 5.0 against SleepSpace's 4.2. Stealth Performance also leads on in-app purchases (none vs 14) and iOS requirement (11.0.0 vs 18.0). SleepSpace's advantage is update cadence (weekly vs every 45 months) and ratings volume (856 vs 2). On price, 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

Both are free to download. SleepSpace sells 13 in-app purchases, starting at $6.99 per month. Stealth Performance asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Stealth Performance holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: SleepSpace has 856 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

SleepSpace ships an update weekly, Stealth Performance every 45 months. The most recent releases landed on September 27, 2026 and September 29, 2026 respectively.

Scorecard6 real differences · 4 level
SleepSpace versus Stealth Performance: the parameters behind the verdict, then further details
ParameterSleepSpaceStealth Performance
PriceFreeFree
Rating4.2 (856 ratings)5.0 (2 ratings) — better
Positive reviews56.4% of reviews—
Number of ratings856 — better2
Update frequencyWeekly — betterEvery 45 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS18.011.0.0 — better
Further details — not scored
Size167 MB65 MB
Age rating4+4+
DeveloperProactive Life IncBen Novak

Customer experience

SleepSpace

All ratings856 ratings
Positive78.7%
Neutral7.1%
Negative14.1%
Written reviews211 reviews
Positive56.4%
Neutral8.1%
Negative35.5%

Stealth Performance

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

SleepSpace

Reported bugs

4 issues
  • Frequent crashes
  • Unreliable sleep data
  • Connectivity issues with Apple Watch
  • Notifications not working as expected

Requested features

5 requests
  • Fade in/out for sounds
  • Offline mode support
  • More customization options
  • Better integration with other wearables
  • Improved sleep analysis and reporting

Stealth Performance

Not enough reviews yet to summarise bugs or requests.

In-app purchases

13 purchases

SleepSpace

Subscriptions10
  • Premium Monthly Subscription1 Month trial$6.991 Month
  • Legacy Dave Asprey Monthly1 Month trial$6.991 Month
  • Premium Monthly Subscription1 Year trial$12.991 Month
Show 7 more
  • Premium Monthly Subscription1 Month trial$12.991 Month
  • Premium Monthly Subscription7 Days trial$12.991 Month
  • Premium Yearly Subscription1 Year trial2 variants$39.991 Year
  • Legacy Dave Asprey Yearly1 Month trial$49.991 Year
  • Premium Yearly Subscription7 Days trial$79.001 Year
  • Premium Yearly Subscription1 Month trial$79.001 Year
  • Premium Yearly Subscription1 Year trial$79.001 Year
One-time3
  • Sage Rader Inceptions$19.99
  • Lifetime SleepSpace Premium$199.99
  • Dave Asprey Lifetime$199.99
None

Stealth Performance

No in-app purchases

Questions

Is SleepSpace free?
SleepSpace is free to download, with in-app purchases available.
Is Stealth Performance free?
Stealth Performance is free to download, with no in-app purchases.
Which has better reviews, SleepSpace or Stealth Performance?
Stealth Performance is rated higher. SleepSpace averages 4.2 out of 5 from 856 ratings, while Stealth Performance averages 5.0 from 2 ratings.
Do SleepSpace or Stealth Performance have ads?
Neither SleepSpace nor Stealth Performance shows ads.
Which is updated more often, SleepSpace or Stealth Performance?
SleepSpace ships an update weekly, and Stealth Performance every 45 months. Most recently, SleepSpace was updated on September 27, 2026 and Stealth Performance on September 29, 2026.

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