Comparison

iSleeper vs Kitten Sleep

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

Head to head
About

iSleeper

This app monitors sleep cycles and records sleep sounds using neural network algorithms. It features a smart alarm clock with light sleep wake-up and voice control, and provides comprehensive sleep statistics. Recordings are stored locally for privacy.

Highlights
  • Sleep cycle analysis
  • Snore and sleep talk recording
  • Smart alarm with light sleep wake-up
  • Voice control for snooze
  • Comprehensive sleep statistics
  • Automatic sleep tracking with Apple Watch
Features
Read full description

iSleeper only requires your mobile phone to complete sleep monitoring, and can accurately record the user's sleeping habits and sleep cycles through neural network algorithms. SLEEP RECORDING We display your sleep recordings on a timeline to maximize the recreation of your sleep. We record various sleep sounds, including snoring, sleep talking, chewing, walking, coughing, sneezing, turning over, sighing, scratching, cat meowing, dog barking, bird chirping, and rooster crowing. All recordings are stored only on your phone, so you don’t have to worry about your sleep recordings being leaked. SMART ALARM CLOCK iSleeper alarm on iPhone supports light sleep wake-up, snooze, and voice control to turn off the snooze alarm. We will wake you up when you are in light sleep within the set time range, and you can turn off the snooze alarm with voice control, and sleep for a while until the final alarm rings. The final alarm needs to be turned off manually. (See "Me" -> "Alarm Settings" for details) The iSleeper alarm on Apple Watch supports light sleep wake-up. We will wake you up when you are in light sleep within the set time range. SLEEP MONITORING We use neural network algorithms to more accurately analyze your sleep cycle and generate a sleep monitoring chart, which includes your sleep score, sleep duration, time in bed, time to fall asleep, time awake, number of awakenings, sleep goal completion, wake time, REM sleep, core sleep, and deep sleep. If you wear an Apple Watch, the analysis page will generate detailed charts for sleep heart rate variability, sleep heart rate, sleep respiratory rate, sleep blood oxygen, and sleep environmental noise. COMPREHENSIVE STATISTICS On the statistics page, you can easily view your sleep trends by week, month, and year. We have also added features for the best sleep day and the worst sleep day, so you can clearly see related information. Understand and analyze the factors affecting your sleep from the trends to improve your sleep. AUTOMATIC SLEEP TRACKING If you wear an Apple Watch while sleeping, just turn on sleep mode, and iSleeper will automatically generate nightly sleep records without needing to open iSleeper on your phone. CONTACT US You can find us in the following ways - Email: femobisleeper@gmail.com - RedNote: iSleeper I am looking forward to hearing your suggestions. Your affirmation and suggestions are our greatest motivation! SUBSCRIPTION PRICE AND TERMS iSleeper can be downloaded for free, upgraded to the iSleeper Pro version, unlocking all paid features (original paid download users will automatically unlock all features),Most features are free to use. Playing recordings and viewing statistics require a Pro membership. We provide three different purchase options: one-time purchase, monthly and annual automatic renewal. Instructions for monthly or annual subscriptions: After confirmation and payment, it will be automatically renewed through your Apple iTunes account. After the deduction is successful, one subscription cycle will be extended. If you need to cancel the subscription, please manually turn off the automatic renewal function in the iTunes / Apple ID settings management at least 24 hours before the end of the current subscription period. During the trial period, if you do not cancel the subscription, the subscription will be automatically activated and deducted at the end of the trial period. This service is up to you to choose whether to cancel. If you choose not to cancel, the renewal service for the next billing cycle will be opened for you. DISCLAIMER OF HEALTH ADVICE All information and advice provided by iSleeper cannot be regarded as medical advice or diagnosis, and should not replace professional diagnosis and treatment. TERMS OF SERVICE AND PRIVACY POLICY Terms of Service: https://isleeper.1008tv.com/terms.html Privacy Policy: https://isleeper.1008tv.com/privacy.html

About

Kitten Sleep

Effortlessly track your sleep without wearables using just your phone. Gain insights into sleep patterns, receive personalized AI scores, and monitor 30-day trends to improve sleep quality. Data is kept private and local.

Highlights
  • Automatic sleep tracking without wearables
  • Zero battery drain technology
  • Contact-free sleep analysis
  • Visualized sleep duration reports
  • AI Sleep Score
  • 30-day sleep trend analysis
  • 100% local data privacy
Features
Read full description

Kitten Sleep: Auto Sleep Tracking via Phone, Scientifically Improve Sleep Challenges. No wearables needed, simply place your phone by your pillow before bed to start effortless sleep tracking, making sleep optimization as natural as breathing. Core Features:
 【Auto Tracking, Effortless Monitoring】
No manual input required. Your phone intelligently detects sleep status, recording full-night data even if you forget to start tracking. Never miss a movement or deep sleep phase. 【Zero Battery Drain Tech】
Industry-first power-efficient monitoring. Track sleep all night without draining battery – wake up to a fully charged phone while safeguarding battery health. 【Contact-Free Revolution】
Ditch wristbands and skin irritation. Achieve professional-grade sleep analysis with just your phone, saving hundreds on hardware. Sleep freely, without constraints. 【Simplified Sleep Report】 • Visualized deep/light/awake durations – pinpoint sleep gaps in 3 seconds.
 • Proprietary AI Sleep Score: Personalized ratings based on age and biological rhythms, mirroring your body’s true state.
 • 30-Day Trends: Identify late-night habits, track progress, and validate improvements with data. Why Choose Us? * 90% of users uncover sleep patterns within 7 days. * Privacy First: Data stays 100% local, never uploaded to the cloud. Act Now – Transform Your Sleep Tonight!
Download now for a 3-day VIP trial!
A third of your life deserves care. Kitten Sleep turns every night into a health investment. Subscription Plans * Monthly: $2.99/month * Annual: $9.99/year Terms: 1. Payment will be charged to your iTunes Account upon confirmation. 2. Subscriptions auto-renew 24 hours before the current period ends. 3. Cancel anytime via iTunes/Apple ID settings at least 24 hours before renewal. 4. Unused trial periods forfeit upon subscription purchase. 5. You control cancellation – no fees if canceled timely. Legal
Privacy Policy: https://kittensleep.com/privacy.html
Terms of Use: https://kittensleep.com/terms.html
Subscription Terms: https://kittensleep.com/subscription.html Start your high-quality sleep journey tonight!

Screenshots

iSleeper4 screens
Kitten Sleep4 screens

Verdict

The call

The clearest difference is rating: Kitten Sleep at 4.8 against iSleeper's 3.3. Kitten Sleep also leads on update cadence (every 9 days vs every 3 weeks) and review sentiment (100% vs 89%). iSleeper's advantage is ads (none vs shown). On price, ratings volume, in-app purchases and monetization model 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. iSleeper sells 3 in-app purchases, starting at $1.99 per month and Kitten Sleep sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Kitten Sleep holds the better App Store score, 4.8 against 3.3. Both are backed by a comparable volume of ratings — 7 and 15 respectively. Written reviews point the same way: 89% of iSleeper's written reviews are positive against 100% of Kitten Sleep's.

UpkeepUpdate frequency

iSleeper ships an update every 3 weeks, Kitten Sleep every 9 days. The most recent releases landed on September 22, 2026 and September 14, 2026 respectively.

Scorecard4 real differences · 6 level
iSleeper versus Kitten Sleep: the parameters behind the verdict, then further details
ParameteriSleeperKitten Sleep
PriceFreeFree
Rating3.3 (7 ratings)4.8 (15 ratings) — better
Positive reviews89.2% of reviews100.0% of reviews — better
Number of ratings715 — better
Update frequencyEvery 3 weeksEvery 9 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size72 MB54 MB
Age rating12+4+
Developer镇坚 陈丽 郝

Customer experience

iSleeper

All ratings7 ratings
Positive57.1%
Neutral0.0%
Negative42.9%
Written reviews74 reviews
Positive89.2%
Neutral5.4%
Negative5.4%

Kitten Sleep

All ratings15 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

iSleeper

Subscriptions2
  • Monthly$1.991 Month
  • Yearly3 Days trial$9.991 Year
One-time1
  • Lifetime Pro$24.99
2 purchases

Kitten Sleep

Subscriptions2
  • monthly subscription$2.991 Month
  • Subscribe continuously 1 year3 Days trial$9.991 Year

Questions

Is iSleeper free?
iSleeper is free to download, with in-app purchases available.
Is Kitten Sleep free?
Kitten Sleep is free to download, with in-app purchases available.
Which has better reviews, iSleeper or Kitten Sleep?
Kitten Sleep is rated higher. iSleeper averages 3.3 out of 5 from 7 ratings, while Kitten Sleep averages 4.8 from 15 ratings.
Do iSleeper or Kitten Sleep have ads?
Kitten Sleep shows ads; iSleeper does not.
Which is updated more often, iSleeper or Kitten Sleep?
iSleeper ships an update every 3 weeks, and Kitten Sleep every 9 days. Most recently, iSleeper was updated on September 22, 2026 and Kitten Sleep on September 14, 2026.

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