Comparison

Sleep Time+ Cycle Alarm Clock vs zZz

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

Head to head
About

Sleep Time+ Cycle Alarm Clock

Understand your sleep patterns and wake up feeling refreshed. This app tracks sleep cycles, offers soothing soundscapes for falling asleep, and measures resting heart rate without wearables. It provides detailed analysis and customizable alarms to optimize your sleep and wake-up experience.

Highlights
  • Sleep cycle analysis
  • Soothing soundscapes
  • Resting heart rate measurement
  • Smart alarm clock
  • Detailed sleep graphs
  • Apple Health integration
Features
Read full description

Fall asleep, stay asleep, and wake up refreshed! Sleep Time is a complete sleep tracker and smart alarm clock. Place your phone on the bed and Sleep Time analyzes your sleep cycles through the night, then wakes you during your lightest sleep within your chosen window — so you start the day rested instead of groggy. Trusted by over 35 million users, Sleep Time is an award-winning sleep app. ------------------ 5/5 “I finally understand why I wake up tired some mornings. Sleep Time showed me my sleep cycles, and the smart alarm has made my mornings so much easier — I haven’t hit snooze in weeks.” 5/5 “I’ve tried several apps that log sleep duration and stages, and the interface of Sleep Time is the best by far. It’s easy to understand and simple to use.” 5/5 “Fascinating results. It works remarkably well providing helpful information.” Featured on: TechCrunch, Mashable, Lifehacker, 148apps, eHealth, and many others. ----------------- MAIN FEATURES √ Set the alarm clock with a single gesture √ Fall asleep to soothing soundscapes and white noise √ Alarm rings even in silent mode √ Choose from 20 built-in alarm sounds √ Wake up to your favorite song from your music library √ Sleep Lab™ with light, deep, and REM sleep analysis √ Detailed daily, weekly, and monthly graphs √ Smart wake-up window for a gentler start to the day √ Full history makes night-to-night comparison easy √ Cloud backup and restore for your sleep data √ Clear, easy-to-read interface √ Apple Health integration We build Sleep Time for our users and would love your feedback. Tell us what you think so we can keep improving the app. Upgrade to Premium for unlimited soundscapes, advanced sleep insights, priority support, and an ad-free experience with an auto-renewable subscription. We offer auto-renewable subscriptions with the following terms: - Payment will be charged to your iTunes account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - No cancellation of the current subscription is allowed during active subscription period - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication - Our privacy policy and terms of use: https://www.azumio.com/page/privacypolicy Sweet Dreams, Azumio Team

About

zZz

Easily log your sleep with a single tap using home or lock screen widgets. Track time in bed, awake time, and actual sleep duration, syncing data with Apple Health for insightful analysis.

Highlights
  • One-tap sleep logging
  • Home and lock screen widgets
  • Tracks time in bed, awake, and sleep
  • Syncs with Apple Health
  • Siri and Shortcuts integration
Read full description

One Tap and your sleep schedule is tracked. Add a small widget to your home or lock screen, tap it before going to bed and after waking up and your sleep is tracked. It doesn't get any easier than this. Widgets: • Go to bed • I just woke up • Used to track your sleep as easy as possible Shortcuts & Siri: • Go to bed • I just woke up • Used to track your sleep as easy as possible via Siri, Shortcuts or Automations • Activate in the zZz settings Your time in bed, time awake (the duration before you fall asleep) and your actual sleeping time is saved to Apple Health. The same data is also read from Apple Health to give you great insights into your sleeping schedules.

Screenshots

Sleep Time+ Cycle Alarm Clock4 screens
zZz4 screens

Verdict

The call

The clearest difference is review sentiment: Sleep Time+ Cycle Alarm Clock at 69% against zZz's 0%. Sleep Time+ Cycle Alarm Clock also leads on rating (4.8 vs 2.9) and ratings volume (2.5K vs 11). zZz's advantage is monetization model (free with in-app purchases vs subscription) and ads (none vs shown). On price, in-app purchases, device support and iOS requirement 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. Sleep Time+ Cycle Alarm Clock sells 8 in-app purchases, starting at $4.99 per month and zZz sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sleep Time+ Cycle Alarm Clock holds the better App Store score, 4.8 against 2.9. That said, the two scores are not equally well evidenced: Sleep Time+ Cycle Alarm Clock has 2.5K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 69% of Sleep Time+ Cycle Alarm Clock's written reviews are positive against 0% of zZz's.

UpkeepUpdate frequency

Sleep Time+ Cycle Alarm Clock ships an update monthly, zZz every 4 days. The most recent releases landed on November 10, 2026 and November 11, 2026 respectively.

Scorecard6 real differences · 4 level
Sleep Time+ Cycle Alarm Clock versus zZz: the parameters behind the verdict, then further details
ParameterSleep Time+ Cycle Alarm ClockzZz
PriceFreeFree
Rating4.8 (2.5K ratings) — better2.9 (11 ratings)
Positive reviews68.8% of reviews — better0.0% of reviews
Number of ratings2.5K — better11
Update frequencyMonthlyEvery 4 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
DevicesiPhoneiPhone, iPad — better
Requires iOS16.016.0
Further details — not scored
Size185 MB6 MB
Age rating4+4+
DeveloperAzumio Inc.Florian Schweizer

Customer experience

Sleep Time+ Cycle Alarm Clock

All ratings2,482 ratings
Positive95.3%
Neutral1.0%
Negative3.7%
Written reviews459 reviews
Positive68.8%
Neutral7.0%
Negative24.2%

zZz

All ratings11 ratings
Positive45.5%
Neutral0.0%
Negative54.5%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Sleep Time+ Cycle Alarm Clock

Reported bugs

4 issues
  • Crashes on startup
  • Freezing issues
  • Inconsistent alarm behavior
  • Lost sleep data after updates

Requested features

4 requests
  • Heart rate monitoring integration
  • Sleep data export and analysis
  • Apple Watch companion app
  • More customization options

zZz

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Sleep Time+ Cycle Alarm Clock

Subscriptions8
  • Premium$4.991 Month
  • Premium$8.991 Month
  • Premium$9.991 Month
Show 5 more
  • Premium7 Days trial2 variants$9.991 Month
  • Premium$19.993 Months
  • Premium$29.991 Year
  • Premium1 Month trial2 variants$29.991 Year
  • Premium$46.991 Year
1 purchases

zZz

One-time1
  • Pro Tier$0.99

Questions

Is Sleep Time+ Cycle Alarm Clock free?
Sleep Time+ Cycle Alarm Clock is free to download, with in-app purchases available.
Is zZz free?
zZz is free to download, with in-app purchases available.
Which has better reviews, Sleep Time+ Cycle Alarm Clock or zZz?
Sleep Time+ Cycle Alarm Clock is rated higher. Sleep Time+ Cycle Alarm Clock averages 4.8 out of 5 from 2.5K ratings, while zZz averages 2.9 from 11 ratings.
Do Sleep Time+ Cycle Alarm Clock or zZz have ads?
Sleep Time+ Cycle Alarm Clock shows ads; zZz does not.
Which is updated more often, Sleep Time+ Cycle Alarm Clock or zZz?
Sleep Time+ Cycle Alarm Clock ships an update monthly, and zZz every 4 days. Most recently, Sleep Time+ Cycle Alarm Clock was updated on November 10, 2026 and zZz on November 11, 2026.

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