Comparison

Sleep Tracker App vs zZZ

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

Head to head
About

Sleep Tracker App

Features
Read full description

How did you sleep last night? Sleep Tracker helps you track and record sleedp cycle details.Β  Sleep Tracker also provides relaxing sleep music to help you sleep better. Main features include a set of playlists to stimulate peaceful sleep, a sleep tracker, and a sleep log. The sleep tracker allows you to input your weekly sleep data and see a graphical interpretation of your sleep patterns, which will allow you to determine your general sleep schedule. The sleep log allows you to input and save any details or important information about your sleep pattern that you might want for future reference.

About

zZZ

This app analyzes your sleep patterns using data from your Apple Watch and Apple Health. It provides detailed sleep stage diagrams, trends, and insights to help you understand and improve your sleep quality. Features include tracking sleep history, heart rate, and respiratory rate.

Highlights
  • Automatic sleep detection with Apple Watch
  • Detailed sleep stage analysis (Awake, REM, Core, Deep)
  • Sleep history tracking (Day, Week, Month, Custom)
  • Monitoring of heart rate and respiratory rate during sleep
  • Sleep quality rating and improvement suggestions
  • Watch app support
  • Privacy-focused data storage
Features
Read full description

zZZ - Sleep Tracker Sleep better with zZZ, your smart sleep assistant. We can analyze your sleep data automatically using your Apple Watch. We using sleep data with the Apple Health app on iPhone empowers you to better manage your sleep. Explore trends about your sleep and compare your sleep quality with many Apple Health metrics that affect sleep. Join us that have discovered the life-changing benefits of great sleep! Track your sleep - Wearing your Apple Watch during sleep. We will automatically detect and analyze your sleep. Analysis your sleep - Detailed sleep stage diagram (Awake, REM, Core Sleep, Deep Sleep) and sleep rate. - Show the percentage & duration of that More Sleep Info - Asleep & Awake time - Explore your sleep history with Day, Week, Month, and Custom Date - Sleeping wrist temperature, Sleeping heartbeat rate, Respiratory rate - Discover all aspects of your sleep Sleep Quality - Analyze your sleep and rate that.Find the bad days or nice dream days - Help you to improve your sleep Setting - Theme Setting - Widget - Notification - More App Icons - Share with friends Watch App - You can also use the app in your watch. Privacy by Design - We uses Apple’s HealthKit API which reads and writes data directly on your device only, and all of your data is stored locally, or on other devices which you enabled iCloud syncing. FINALLY, Wish you have a good night~

Screenshots

Sleep Tracker App4 screens
zZZ4 screens

Verdict

The call

The clearest difference is update cadence: zZZ at every 2 days against Sleep Tracker App's every 3 weeks. Sleep Tracker App's advantage is iOS requirement (10.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sleep Tracker App ships an update every 3 weeks, zZZ every 2 days. The most recent releases landed on September 26, 2026 and October 6, 2026 respectively.

Scorecard2 real differences Β· 6 level
Sleep Tracker App versus zZZ: the parameters behind the verdict, then further details
ParameterSleep Tracker AppzZZ
PriceFreeFree
Positive reviewsβ€”100.0% of reviews
Update frequencyEvery 3 weeksEvery 2 days β€” better
AdsNoNo
In-app purchasesNoNo
Monetizationβ€”Free
DevicesiPhone, iPodiPhone, iPad, Apple Watch β€” better
Requires iOS10.0 β€” better17.0
Further details β€” not scored
Size83 MB41 MB
Age rating4+12+
DeveloperLeticia Vila子龙 ιƒ­

In-app purchases

None

Sleep Tracker App

No in-app purchases

None

zZZ

No in-app purchases

Questions

Is Sleep Tracker App free?
Sleep Tracker App is free to download, with no in-app purchases.
Is zZZ free?
zZZ is free to download, with no in-app purchases.
Do Sleep Tracker App or zZZ have ads?
Neither Sleep Tracker App nor zZZ shows ads.
Which is updated more often, Sleep Tracker App or zZZ?
Sleep Tracker App ships an update every 3 weeks, and zZZ every 2 days. Most recently, Sleep Tracker App was updated on September 26, 2026 and zZZ on October 6, 2026.

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