Cycle Tracking vs Sleep Details
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cycle Tracking
This app helps you discreetly track your menstrual cycle, including flow, symptoms, and fertility. Receive timely notifications for your period and fertile windows, with data syncing to your iPhone's Health app.
- Daily log for flow, symptoms, and fertility
- Track ovulation test results and BBT
- Period and fertile window predictions
- Pregnancy tracking and gestational age
- Customizable period and fertile window notifications
- Cycle history and statistics in Health app
- Encrypted health data with iCloud sync
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Cycle Tracking provides a convenient and discreet way to track your menstrual cycle using Apple Watch. Easily log your period, including flow levels, symptoms and fertility information. Choose to receive notifications for when your period or fertile window is about to begin. Features - Use the daily log to note flow level and any symptoms such as cramps, headaches and bloating. - Easily track results from ovulation prediction kits, or readings from a basal body thermometer. - Cycle Tracking will display a prediction for when your next period will start and your fertile window. - See current gestational age and log symptoms experienced during pregnancy in Cycle Tracking when you log a pregnancy in the Health app. - Turn on notifications so you can receive an alert before your period or fertile window is likely to start. - Onboard onto perimenopause or menopause stages via the Health app on iPhone. - See additional detail including your cycle history and statistics in the Health app on iPhone. • When your phone is locked with a passcode, all your health and fitness data in the Health app — other than your Medical ID — is encrypted. Your health data stays up to date across all your devices automatically using iCloud, where it is encrypted while in transit and on Apple servers.
Sleep Details
Track your sleep data and receive a daily sleep score based on information from your Apple Watch. Gain insights into sleep stages, heart rate, and more, with personalized ratings and factor tagging. Features a memory test and daily summaries for enhanced understanding of your sleep's impact.
- Daily sleep score
- Detailed sleep metrics
- Personalized sleep rating
- Sleep factor tagging
- Morning notifications
- Memory test
- Daily sleep summaries
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Track your sleep related data and see your daily sleep score based on data collected by your Apple Watch. Sleep Details requires an Apple Watch with watchOS 10 or later installed. Sleep Details integrates with the Health app and uses data stored in the Health app. Key features: -Daily sleep score based on sleep duration and other relevant sleep related data -See details of the following sleep related data: Sleep stages and times, Activity while sleeping, Heart rate, Heart rate variability, Respiratory Rate, Blood oxygen levels (SpO2 data is available only on Apple Watch series 6 or later devices), Wrist Temperature (only available on Apple Watch series 8 and Apple Watch Ultra devices ) -Privacy: We do not collect any data from your devices -Receive morning notifications with last nights sleep score and sleep duration -Rate your sleep. Your personal feeling based rating will also adjust your daily score -Tag your sleep with factors that possibly affected your sleep. For example if you feel that caffeine affected your sleep you can tap the caffeine icon to tag your sleep -Add naps: In the iPhone app you can add naps that Sleep Details has detected. You can also add naps manually. Your naps duration will contribute to your daily sleep duration and therefore affect your daily score and sleep dept calculations. -Night Mode: If you open Sleep Details during the night, you will see your most recent 4 hour Heart Rate, Heart Rate Variability and Blood Oxygen (Series 6 or later) averages. -Daily Sleep Summary: Devices that support Apple Intelligence can use the 'Generate summary' feature to generate a daily sleep summary with additional insights (iOS 26 required). -Sleep has an important role in the performance of your memory. To highlight this, we added a simple memory test in Sleep Details: 1) Before going to bed try memorize a set of icons and their location. 2) Then after waking up, try remember and fill in these items. 3) New icons and locations will be generated for each day, so you can track your long-term progress by completing a new test each day. -Add Sleep Details as a complication on your watch faces -On your Apple Watch you can tap different metrics to see more details -Two week sleep score trend available on your iPhone. You can tap different days to see the sleep details of the selected day -On your iPhone you can tap different metrics to get a description of the selected metric -History view with your all-time averages and min/max values for all available sleep related data -After your free seven day trial has ended you can continue to use the app by purchasing monthly subscription or the "Lifetime access" in-app purchase. Purchases can also be made before the trial ends by tapping the trial end date. -"Lifetime access" and monthly subscription purchases will also unlock the Sleep Details toolbar and comparison charts Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula How are different health metrics used to calculate your last nights sleep score? As an example your score will be lower if your last nights heart rate average is higher than your weekly resting heart rate average. In this case the heart rate ring will be colored red so you can easily spot which metrics are negatively affecting your score. If you have any questions we will happily help you: contact@sydvesti.com
Screenshots
Verdict
The clearest difference is rating: Sleep Details at 4.4 against Cycle Tracking's 2.9. Sleep Details also leads on update cadence (every 2 months vs every 11 months) and ratings volume (1.1K vs 28). Cycle Tracking's advantage is in-app purchases (none vs 3) and iOS requirement (13.0 vs 18). On price, review sentiment, 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
Both are free to download. Sleep Details sells 3 in-app purchases, starting at $2.99 per month. Cycle Tracking asks for nothing beyond the download.
Sleep Details holds the better App Store score, 4.4 against 2.9. That said, the two scores are not equally well evidenced: Sleep Details has 1.1K ratings behind it against 28, so its average is the more settled of the two. Written reviews point the same way: 45% of Cycle Tracking's written reviews are positive against 50% of Sleep Details's.
Cycle Tracking ships an update every 11 months, Sleep Details every 2 months. Both last shipped on October 24, 2026.
| Parameter | Cycle Tracking | Sleep Details |
|---|---|---|
| Price | Free | Free |
| Rating | 2.9 (28 ratings) | 4.4 (1.1K ratings) — better |
| Positive reviews | 45.5% of reviews | 50.0% of reviews — better |
| Number of ratings | 28 | 1.1K — better |
| Update frequency | Every 11 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, Apple Watch |
| Requires iOS | 13.0 — better | 18 |
| Further details — not scored | ||
| Size | 3 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Apple | Sydvesti Oy |
Customer experience
Cycle Tracking
Sleep Details
Bugs and requests
Cycle Tracking
Not enough reviews yet to summarise bugs or requests.
Sleep Details
Reported bugs
3 issues- Sleep stage section disappeared
- App keeps kicking user out
- Widget doesn't update with current data
Requested features
4 requests- Add ability to log naps
- Improve widget updates
- Provide more explanation of sleep metrics
- Implement REM sleep tracking
In-app purchases
Cycle Tracking
No in-app purchases
Sleep Details
- Monthly subscription$2.991 Month
- Yearly subscription$29.991 Year
- Lifetime Access$59.99









