Sleepcraft: Sleep Tracker

Deep & REM Stages Analysis

Only for iPhone

Free

iPhone

Individual scores for deep sleep, REM, and every sleep phase. 12h clock face. Age-adjusted clinical benchmarks. See how your habits impact sleep quality. 100% on-device. Sleepcraft reads your sleep data from Apple Health and breaks it down differently than most apps. It shows your sleep on a 12-hour clock face so you can see exactly when you got deep sleep, REM, light sleep, and awake periods. Instead of one combined sleep score, Sleepcraft gives each phase its own score — deep, REM, light, continuity, and regularity — so you know exactly what's working and what isn't. Scoring is calibrated to your age and sex. A 50-year-old man and a 25-year-old woman have different optimal deep sleep and WASO targets, based on clinical benchmarks from the NIH, CDC, and NHS. You can tag daily factors like late coffee, alcohol, or a hard workout and see how they affect not just your overall sleep, but each individual stage. Some patterns aren't obvious — for some people, ovulation can increase deep sleep, or a daytime nap might actually extend total sleep duration rather than shorten it. Sleepcraft surfaces these personal links so you're not guessing. It also connects your daytime active energy and HRV to nightly recovery, and uses your historical data to forecast tonight's sleep quality based on your current trends. All processing happens on your iPhone. No backend servers, no accounts. Your tagged factors and ratings sync through your own iCloud.

  • 5.0
    out of 5
    26 Ratings

New metrics * Breathing. Track nightly respiratory rate against your baseline to spot stress or early illness. * Daylight After Waking. See how much daylight you get in the first 3 hours after waking, a key signal for your body clock. Enable it in Daily Metrics in the bottom of the screen. UI improvements * Reorder your sleep grid by long-pressing and dragging tiles. * Sleep duration is now inside the sleep ring. * Trend charts have been redesigned with clearer nightly dots and ranges. Other * Smarter patterns in metrics sheets now surface automatic influences like activity, bedtime, and daylight, not just your tagged factors. * Continuity has been renamed Awake Time. * Health syncing is more reliable: a refresh hiccup no longer clears your timeline.

The developer, Nikolai Fabrika, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • Dark Interface

    Seller
    • Nikolai Fabrika
    Size
    • 11.1 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    Languages
    English and 9 more
    • English, French, German, Japanese, Korean, Russian, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese
    Age Rating
    13+
    • 13+
    • Infrequent
      Medical Treatment information

      Contains
      Health or Wellness Topics
    Copyright
    • © 2026 Nikolai Fabrika