Hadalog: Skin Condition Log

Tomorrow's skin, known today

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

Your skin moves with the weather and your habits. Hadalog turns a three-question check plus weather and health data into a picture of today and tomorrow. Hadalog makes "why is my skin different today?" visible as an overlap of weather and daily habits. No camera, no photos of your face. ■ How it works Tap through three questions — tightness, oiliness, unsettledness — on a five-point scale. It takes about fifteen seconds. If you own a moisture meter, you can enter its readings instead. Weather (humidity, temperature, UV, wind) and Health (sleep, steps, water, cycle) are gathered automatically for the items you allow, and treated as that day's inputs. In the evening, one tap tells the app how it actually went, and the forecast moves closer to your own patterns. After fourteen days of records, it switches from general patterns to your own. Optional tags let you note what you saw — breakouts, redness, itchiness, dark spots, dullness. Register the products you use and you can later compare your average index on the days you used them against the days you did not. You can also record and check back from Apple Watch, and put today's index on a complication. ■ Free features ・Today's skin condition index ・Today's care suggestions ・Daily entries and records (unlimited) ・Product log ・Evening check-back ・Calendar and 7-day trend ■ With full access (one-time purchase) ・Tomorrow's forecast and suggestions ・Long-range trends, factor correlations, cycle phase ・Products and your index ・PDF export ・Local backup ■ Your data Your records and Health data never leave your device, and no account is needed. Only when fetching the weather is your location sent to Apple. Full access is a one-time purchase. It is not a subscription — buy it once and it stays. Recording and today's index are free and unlimited. Hadalog is a self-tracking app. It is not a substitute for medical diagnosis or care. If something concerns you and persists, please consult a dermatologist.

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・Try every full access feature for 7 days after you install ・What you noticed (breakouts, redness, itchiness, dark spots, dullness) now shapes the day's suggestions too ・Note when you started using a product ・Undo a deletion of a record or a product ・Backups now include your area, notification times and Health choices Fixes ・When no area was set, the app said "Couldn't get the weather. Check your connection" — which was not the reason — and offered no way to set one. You can now reach both current location and area from there ・With no weather or Health data at all, the app still said "Nothing special needed today". It now says when there is nothing to go on ・Swiping the entry sheet down discarded your input without asking. It now asks ・Secondary text was too faint to read comfortably in bright light. It is darker now ・Cycle-phase trends and factor relationships now show how many days they are based on. Phases with fewer than 3 days are not shown ・The self-check showed "Average" even when nothing was selected. It now says "Not selected" ・Settings had a different background from the other tabs. Fixed ・At the largest text size, the wording for the index level was cut off. Fixed

The developer, YANGLI CHEN, 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 based, for example, on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Provider
    • YANGLI CHEN
    Size
    • 8 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    • Apple Watch
      Requires watchOS 26.0 or later.
    Languages
    English and 32 more
    • English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
    Age Rating
    13+
    • 13+
    • Infrequent
      Medical Treatment Information

      Contains
      Health or Wellness Topics
    In-App Purchases
    Yes
    Copyright
    • © 2026 freetokyo