SkinLogs is a private, on-device record of your skin's appearance, and what you put on it, over time. People use it to patch test a new product, keep a private photo and notes diary alongside eczema, psoriasis, acne, rosacea, hives, contact dermatitis, or vitiligo, or just record a change they're curious about. Just your own photos, notes, and simple local summaries, never sent anywhere.

WHAT IT DOES
• Log your day in seconds from the Today screen or a home-screen widget: rate how your skin feels and tick off your routine.
• Photograph an area of skin with a quick photo, or upload one from your library. Saving a scan is entirely local. Nothing is analyzed or sent anywhere.
• Match Camera: adding a photo to a folder shows your last one as a faint guide, with a tilt level and a light check, so every photo lines up with the one before. Geometry and light only, nothing about the skin itself.
• Draw directly on a saved photo to circle or point out what you noticed, a personal note, not analysis.
• Compare two photos with a manual drag-slider or a side-by-side overlay blend. No automated analysis, just your own eyes.
• Track a Diary of severity, itch, triggers, and relief, with an optional voice memo on any check-in, a severity calendar, and an optional weekly comfort check-in.
• Track a Routine of what you're using or testing out, ointments, sunscreen, a new product, anything, with simple frequency reminders. Flag what's not working, and see it alongside your Diary entries.
• Insights lists the patterns in your own entries, strongest first.
• Routine Pattern Finder: tag a product to the area it's for, and once you've logged enough Diary check-ins, it compares your average severity on days you used it against days you didn't, labeled Early signal, Worth a look, or Consistent pattern, with side-by-side photos when you have them. Entirely local arithmetic, never a diagnosis.
• Skin Story: a private monthly and yearly recap of what you logged, with a shareable card (photos only if you add them).
• Optional Health Connect: if you turn it on, SkinLogs reads sleep, workouts and period days (read only) and shows them next to your check-ins. Readings stay on your phone and are never stored, backed up or sent.
• Organize scans into tracking folders per body location, with optional rescan reminders you can restrict to specific days of the week, so you can see how something changes over weeks or months.
• Progress report pulls a folder's photos together with simple local summaries built from your own Diary and Routine entries, averages, counts, and plain trend comparisons. No AI, no medical assessment, just arithmetic over what you already logged.
• Lock SkinLogs with your fingerprint, face or screen lock, seal backups with your own passphrase, and schedule automatic backups to a folder you choose.
• Search your scan history and Diary notes to find a specific entry fast.
• Export a PDF of your own records to keep or share however you like.

WHAT IT IS NOT
SkinLogs is not a medical device. It does not diagnose, treat, cure, or prevent any medical condition, and is not a health-monitoring tool. Only a licensed medical professional can diagnose a condition. If you notice pain, bleeding, rapid change, or anything concerning, seek medical care right away regardless of what SkinLogs shows you.

ACCOUNT AND PRO
No account is needed to start. Photos, your library, and your planner are free forever. Diary, Routine, Compare, and Progress report are free for a 30-day trial, then need a free account and Pro: a monthly subscription, or a one-time lifetime purchase if you'd rather not subscribe.

YOUR DATA STAYS WITH YOU
Your photos, diary entries, and routine data are stored only on your device, not on our servers. None of it is ever sent anywhere. See the privacy policy for details.