Trace: Acne & Skin Tracker
Track Progress, Test Products
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
See if your skincare is actually doing anything.
Trace turns a daily selfie into four simple numbers, so you can watch your skin over weeks instead of guessing in the mirror every morning.
HOW IT WORKS
1. Scan your face. It takes about two seconds.
2. Keep your routine steady and change one thing at a time.
3. Watch the line. Weeks tell you what a single day never can.
WHAT YOU SEE
Four scores, each 0 to 100, where higher always means calmer and clearer:
Acne, Redness, Pores, Spots.
Plus a trend line for each, a daily note from your Trace buddy, and a report at the end of every test.
ONE THING AT A TIME
Change three products at once and your skin improves, and you have learned nothing. Trace is built around changing one variable while everything else holds still. It is slower. It is also the only honest way to find out what worked on your face.
YOUR PHOTOS STAY ON YOUR PHONE
Skin analysis runs entirely on your iPhone. Your face is never sent to a third party AI service. Photos sync only to your own private account.
TALK TO IT LIKE A DIARY
Tell Trace what you ate, how you slept, whether you were stressed, travelling, or on your period. It lines all of that up against your skin trend, so you can tell a product effect from ordinary life noise.
WHY WEEKS, NOT DAYS
Adult skin renews itself over roughly 28 days, and most active ingredients need four to six weeks before anything real shows up. One day of wiggle means almost nothing. The line means a lot.
WHAT TRACE IS NOT
Trace measures, it does not diagnose. The scores describe what the camera saw in this light, on this day. They are not a medical assessment. If something about your skin worries you, please see a dermatologist.
FREQUENTLY ASKED
Q: Is my face uploaded to an AI server?
A: No. Scans run on your iPhone. Photos sync only to your private account.
Q: How soon will I see something?
A: Give it a few weeks. Day to day movement is normal and expected. The trend is the part worth reading.
Q: Can I test more than one product at a time?
A: You can, but then you will not know which one did it.
Q: What if I miss a day?
A: Nothing breaks. Come back and keep going. The line survives gaps better than you would think.
SUPPORT
Questions, bugs, or feedback: support@traceshq.com
One product. Twenty-eight days.
Trace now reads your latest photo and picks a single product for you, then asks you to stay with it for 28 days. One thing at a time is the only way to tell what actually made a difference. Your daily photos do the rest.
Your skin diary, out loud
Hold the button and just talk about your day. Buddy turns it into notes on that day's page, so food, sleep, stress and new products sit right next to what your skin is doing.
Trace now speaks your language
The whole app is available in French, German, Spanish and Simplified Chinese. Switch any time in Settings.
Your photos follow you
Reinstall the app or move to a new phone and your history comes back, every day and every layer.
Also in this release
A crash when sending a voice note is fixed, along with a long list of smaller rough edges across the diary, the timeline and your report.
The developer, Siyuan Liang, 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 Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Location
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Siyuan Liang
- Size
- 131.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Simplified Chinese, Spanish
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © 2026 Siyuan Liang
