Comparison

Pillow vs SleepisolBio

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

Head to head
About

Pillow

This app helps you understand and improve your sleep. It automatically tracks your sleep cycles, analyzes heart rate, and records audio events like snoring. Get personalized insights and tips to wake up feeling refreshed.

Highlights
  • Automatic sleep tracking
  • Smart alarm clock
  • Snore and sleep talking recorder
  • Sleep cycle analysis
  • Heart rate analysis
  • Personalized sleep tips
  • Sleep aid library
Features
Read full description

Sleep trouble? Sleep better with Pillow, your smart sleep tracker. Pillow can analyze your sleep cycles automatically using your Apple Watch, iPhone or iPad. Use Pillow as a smart alarm clock to wake up at the lightest possible sleep stage and start your day refreshed and relaxed. Record important audio events such as snoring, sleep apnea, and sleep talking. Explore trends about your sleep and compare your sleep quality with many Apple Health metrics that affect sleep. As seen on: The New York Times, Forbes, The Guardian, BuzzFeed, The Washington Post, TechCrunch, MacStories, Daily Mail, and many more. Rated as one of the best sleep tracking apps for the Apple Watch and iPhone. Join the millions that have discovered the life-changing benefits of great sleep! TRACK YOUR SLEEP AUTOMATICALLY - Simply wear your Apple Watch during sleep. Pillow will automatically detect and analyze your sleep. - View last night's report right on your Apple Watch, along with the heart rate analysis for the night. - Switch between manual and automatic mode anytime. SLEEP CYCLE & HEART RATE ANALYSIS - Advanced sleep cycle analysis algorithm based on the latest scientific findings in sleep research. - Detailed heart rate analysis - Detailed sleep stage diagram (Awake, REM, Light Sleep, Deep Sleep) and sleep score. - Home Screen, Lock Screen Widgets and Apple Watch Complications AUDIO RECORDINGS USING MACHINE LEARNING - Snoring, sleep apnea, sleep talking and other nightly sounds. - All processing is done using on-device intelligence to ensure privacy. PERSONALISED INSIGHTS & SLEEP TIPS - Create a unique personal sleep program to reach your goals - Regularly updated sleep tips - Advanced Insights, including optimal bedtime, chronotype and more. SLEEP TRENDS - Explore your sleep history with Week, Month, Year, and All Time overviews. - Compare your sleep quality with many Apple Health categories that affect sleep. BACKUP & SYNCHRONIZE - Synchronize and backup your sleep data and audio recordings between your devices. ALARM PRESETS & NAPS - Powernap, recovery, and full-cycle nap - Customisable alarm presets MOOD & NOTES - Track your mood when you wake up - Discover how your notes affect your sleep quality SLEEP AID - Access an expanding library of Meditations, Bedtime Stories, Soundscapes and Music. - Use a track from Apple Music or iTunes as an alarm. - Siri Wind Down support PREMIUM FEATURES: - Unlimited sleep history & analysis - Advanced sleep analysis - Sleep trends & Apple Health comparison - Sleep notes - Heart rate analysis - Sound recordings - Nap modes & Customisable presets - Access to Sleep aid library - Access to all wake-up melodies - Discover: Create a personalised sleep program. - Wake-up melodies from your iTunes library or Apple Music - Data export in CSV format - Smart Wake-up Learn more at https://pillow.app SUBSCRIPTION INFORMATION Your payment will be charged to your iTunes Account as soon as you confirm your purchase. You can manage your subscriptions and turn off auto-renewal from your Account Settings after the purchase. If you start a free trial, you will be charged automatically at the end of the trial period unless you cancel 24 hours before the expiration period. Your subscription will renew automatically unless you turn off auto-renew at least 24 hours before the end of the current period. The renewal cost will be charged to your account within 24 hours before the end of the current period. When canceling a subscription, your subscription will stay active until the end of the period. Auto-renewal will be disabled, but the existing subscription will not be refunded. If offered, any unused portion of a free trial period will be forfeited when purchasing a subscription. Terms & Privacy Policy: https://pillow.app/pillow-privacy-policy-en

About

SleepisolBio

Read full description

Get Personalized Sleep Management for Free! Enjoy a comprehensive suite of sleep management features, absolutely free and without any restrictions. Completely Free, No Limits! Access all content without ads, subscriptions, or paywalls. • Sleep Therapy: 48 Sound Therapy tracks (12 each for Sleep, Focus, Healing, and Stress Relief) • Mindfulness Content: - 6 Sound Therapy Tracks - Brain Wave Therapy: 16 Theta waves, 24 Alpha waves, 24 Beta waves, 32 Gamma waves All MP3 audio files in the Sleepisol Bio app are produced in high-quality 320kbps, 48kHz stereo. • Bedtime Stories: 6 classic tales - Snow White and the Seven Dwarfs - Hansel and Gretel - The Three Little Pigs - Jack and the Beanstalk - Cinderella - The Swan Princes • Real-time Generated Sound-based Therapy: - Monaural beats - Binaural beats - Isochronic tones Your Sleep Data, Front and Center We prioritize displaying the information you need, not intrusive ads or subscription prompts. Sleepisol Bio places your sleep analysis data prominently at the top of the home screen. The Ultimate Personalized Sleep Management System Sleep health is important not just when you’re asleep, but also throughout your entire day. Our app analyzes your sleep tracking data to automatically recommend the most suitable therapy features based on your individual circadian rhythm. With just a few taps, you can access personalized sleep management tools tailored to your unique needs. Personalized Therapy via Real-time Biofeedback Sleepisol Bio analyzes your real-time heart rate data to provide the most effective personalized therapy. Wake Up to a Happier Morning with Our Diverse Alarm Selection A smooth morning wake-up is crucial for overall sleep health. Sleepisol Bio offers a wide range of alarm options, including special alarms for holidays and birthdays. • 30 General Alarms • 18 Brain Wave Alarms (to gently stimulate your mind) • 10 Christmas Alarms • 10 New Year's Alarms • 10 Birthday Alarms Gentle Brain Activation with Engaging Missions Sleepisol Bio offers three wake-up missions to gently ease you into your day. These light hand and brain warm-up exercises help you naturally transition from sleep to wakefulness. • Hand Motion Wake-up: wake up with simple hand motion recognition. • Math Wake-up: wake up with simple calculations. • Sleep Info Wake-up: wake up with quizes that present your own sleep information. Sleepisol Bio strives to be your personal sleep expert. • For enhanced features, the app is compatible with the Apple Watch and Leesol's Sleepisol Device. • Sleepisol Bio is not intended for medical use. • Sleepisol Bio stores and processes all data locally on your device.

Screenshots

Pillow4 screens
SleepisolBio4 screens

Verdict

The call

The clearest difference is in-app purchases: SleepisolBio at none against Pillow's 6. SleepisolBio also leads on iOS requirement (15.6 vs 17.0). Pillow's advantage is chart position (#170 vs unranked). On price, update cadence, 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. Pillow sells 6 in-app purchases, starting at $19.99 per month. SleepisolBio asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 10 days. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

Scorecard3 real differences · 8 level
Pillow versus SleepisolBio: the parameters behind the verdict, then further details
ParameterPillowSleepisolBio
PriceFreeFree
Rating4.4 (96K ratings) — better—
Positive reviews41.6% of reviews—
Number of ratings96K — better—
Update frequencyEvery 10 daysEvery 10 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
Best chart rank#170 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPod, Apple Watch
Requires iOS17.015.6 — better
Further details — not scored
Size690 MB1.1 GB
Age rating12+4+
DeveloperNeybox Digital Ltd.leesol

Bugs and requests

Pillow

Reported bugs

4 issues
  • App crashes or freezes
  • Sleep data not syncing properly
  • Audio recording issues
  • Alarm not working as expected

Requested features

4 requests
  • Ability to edit sleep sessions and data
  • Sleep cycle trends and insights
  • Dream journal integration
  • More customization options for alarms and sounds

SleepisolBio

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Pillow

Subscriptions5
  • Pillow Premium - Monthly$19.991 Month
  • Premium Sleep Tracking7 Days trial$49.991 Year
  • Pillow Premium - Annual$49.991 Year
Show 2 more
  • Pillow Premium - Annual1 Year trial$49.991 Year
  • Pillow Premium - Quarterly$59.993 Months
One-time1
  • Pillow Premium - Legacy$249.99
None

SleepisolBio

No in-app purchases

Questions

Is Pillow free?
Pillow is free to download, with in-app purchases available.
Is SleepisolBio free?
SleepisolBio is free to download, with no in-app purchases.
Do Pillow or SleepisolBio have ads?
Neither Pillow nor SleepisolBio shows ads.
Which is updated more often, Pillow or SleepisolBio?
Pillow ships an update every 10 days, and SleepisolBio every 10 days. Most recently, Pillow was updated on October 21, 2026 and SleepisolBio on October 11, 2026.

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