Comparison

Sleep Time+ Cycle Alarm Clock vs Caffeine App

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

Caffeine App

Track your caffeine intake from various beverages and monitor your hydration levels. Visualize your caffeine curve over 24 hours and receive notifications for your optimal sleep time. Integrates with Apple Health and Apple Watch for seamless logging and data syncing.

Highlights
  • Log caffeine from coffee, tea, and energy drinks
  • Visualize 24-hour caffeine curve
  • Calculate optimal sleep time
  • Track daily water intake
  • Apple Watch logging and complications
  • Apple Health integration
  • iCloud sync
Features
Read full description

How much caffeine is still in your body? When can you fall asleep? Are you drinking enough water? Caffeine App gives you the answers — at a glance. Caffeine Tracking • Log every coffee, tea, espresso, energy drink, or mate • Scrollable 24-hour timeline shows your caffeine curve • See how much caffeine is currently in your system • Create custom drinks with individual caffeine amounts • Caffeine calculator for drinks with unusual sizes Optimal Sleep Time • Caffeine App calculates when you're ready to sleep • Get notified when your sleep time is reached • Set your personal caffeine limit and desired sleep time Water Tracking • Track your daily water intake with personalized goals • Save your favorite glass and bottle sizes • Customizable reminders to stay hydrated Statistics • Daily caffeine and water charts across your full history • See which drinks make up most of your caffeine • Compare your water intake against your daily goal Widgets • Caffeine Now: current caffeine level and 30-day history • Water Intake: today's progress towards your goal • Quick Log: log your favorite drink with one tap • Home Screen and Lock Screen widgets Apple Watch • Log caffeine and water right from your wrist • Daily charts for caffeine and water • Complications show your optimal sleep time More Features • Apple Health integration — caffeine and water entries stay in sync • iCloud sync across all your devices • Dynamic Type for optimal readability • URL scheme support

Screenshots

Sleep Time+ Cycle Alarm Clock4 screens
Caffeine App4 screens

Verdict

The call

The clearest difference is monetization model: Caffeine App at free with in-app purchases against Sleep Time+ Cycle Alarm Clock's subscription. Caffeine App also leads on ads (none vs shown) and device support (3 vs 1). Sleep Time+ Cycle Alarm Clock's advantage is ratings volume (2.5K vs 342) and iOS requirement (16.0 vs 18.0). On price, rating, review sentiment and update cadence 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 Caffeine App 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

On the App Store both sit at effectively the same score — 4.8 for Sleep Time+ Cycle Alarm Clock against 4.6 for Caffeine App. That said, the two scores are not equally well evidenced: Sleep Time+ Cycle Alarm Clock has 2.5K ratings behind it against 342, so its average is the more settled of the two. Written reviews are what separate them: 69% of Sleep Time+ Cycle Alarm Clock's written reviews are positive against 74% of Caffeine App's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on November 10, 2026 and November 11, 2026 respectively.

Scorecard5 real differences · 5 level
Sleep Time+ Cycle Alarm Clock versus Caffeine App: the parameters behind the verdict, then further details
ParameterSleep Time+ Cycle Alarm ClockCaffeine App
PriceFreeFree
Rating4.8 (2.5K ratings) — better4.6 (342 ratings)
Positive reviews68.8% of reviews73.7% of reviews — better
Number of ratings2.5K — better342
Update frequencyMonthlyMonthly
AdsYesNo — better
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
DevicesiPhoneiPhone, Apple Watch, Vision Pro — better
Requires iOS16.0 — better18.0
Further details — not scored
Size185 MB20 MB
Age rating4+4+
DeveloperAzumio Inc.Oleg Mueller

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%

Caffeine App

All ratings341 ratings
Positive92.1%
Neutral5.9%
Negative2.1%
Written reviews76 reviews
Positive73.7%
Neutral14.5%
Negative11.8%

User reviews

Sleep Time+ Cycle Alarm Clock

From 2.5K App Store ratings

What we love

  • 🚀 Helps track sleep patterns
  • 👍 Gentle alarm wakes you up
  • 🌊 Soundscapes help fall asleep
  • 💤 Provides sleep quality insights

Room to improve

  • 🐛 Alarm issues (fails to go off, resets unexpectedly)
  • 🔋 Battery drain
  • 💰 Paywall for core features
  • 🤖 Inaccurate sleep tracking

Caffeine App

From 342 App Store ratings

What we love

  • 👍 Easy to use and intuitive interface
  • 🎯 Accurate caffeine tracking and decay calculations
  • ⏰ Helpful sleep readiness predictions
  • 🏥 Apple Health integration for long-term tracking
  • ⌚ Apple Watch support with quick logging

Room to improve

  • ⚠️ Recent performance degradation from new features
  • 📊 Graphs become too small with multiple charts enabled
  • ⏳ Long graphics update delays affecting responsiveness
  • 🐛 Sleep ready time shows current time instead of prediction
  • 🌍 Limited beverage library for non-German markets

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

Caffeine App

Reported bugs

10 issues
  • Sleep ready time displays current time instead of predicted sleep time
  • Cannot rename custom amounts until after adding them
  • Newly added custom amounts appear at bottom of list
  • Health app data from third-party apps not syncing
  • All presets missing in some versions
Show 5 more
  • HealthKit integration broken in certain versions
  • Shift work time differential not processed correctly
  • Outdated caffeine data for Dunkin Donuts beverages
  • Graphics update delays causing app unresponsiveness
  • Watch app loading issues on initial launch

Requested features

20 requests
  • Toggle option to disable bar chart visualization
  • Taller graph display area with scrolling capability
  • Personalization based on body weight and metabolism
  • Ounce-based measurement options for drinks
  • Multi-day and historical trend analysis
Show 15 more
  • Siri Shortcuts integration for automated logging
  • Today widget for quick access
  • Mood and energy level tracking
  • More granular unit adjustments (fractions of shots)
  • Expanded beverage library (Monster Java, Sheetz coffee, K-cups, etc.)
  • Custom coffee group creation without preset requirements
  • Apple Watch complications showing current caffeine levels
  • Watch app graph visualization
  • Headache threshold level tracking
  • Future-looking graph projections
  • Water consumption tracking integration
  • Ability to rename custom amounts before adding
  • Custom amounts appearing at top of list instead of bottom
  • Shift work schedule support
  • Average daily caffeine statistics

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

Caffeine App

One-time1
  • Unlock Pro$4.99

Questions

Is Sleep Time+ Cycle Alarm Clock free?
Sleep Time+ Cycle Alarm Clock is free to download, with in-app purchases available.
Is Caffeine App free?
Caffeine App is free to download, with in-app purchases available.
Which has better reviews, Sleep Time+ Cycle Alarm Clock or Caffeine App?
Sleep Time+ Cycle Alarm Clock is rated higher. Sleep Time+ Cycle Alarm Clock averages 4.8 out of 5 from 2.5K ratings, while Caffeine App averages 4.6 from 342 ratings.
Do Sleep Time+ Cycle Alarm Clock or Caffeine App have ads?
Sleep Time+ Cycle Alarm Clock shows ads; Caffeine App does not.
Which is updated more often, Sleep Time+ Cycle Alarm Clock or Caffeine App?
Sleep Time+ Cycle Alarm Clock ships an update monthly, and Caffeine App monthly. Most recently, Sleep Time+ Cycle Alarm Clock was updated on November 10, 2026 and Caffeine App on November 11, 2026.

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