Trace: Acne & Skin Tracker
Siyuan Liang Health & Fitness iPhoneiPadiPod touch
Trace: Acne & Skin Tracker is a free Health & Fitness app for iPhone and iPad by Siyuan Liang. Rated 5.0/5 from 13 ratings. Requires iOS 17.0.
- Rating
- 5.0
- 13 ratings
- Price
- Free
- on the App Store
- Size
- 127 MB
- Age 12+
- Updated
- Aug 14
- 2026 · v1.3.1
Screenshots
About Trace: Acne & Skin Tracker
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 SCAN RUNS ON YOUR PHONE Your four skin scores are measured on your iPhone, so scanning never sends your photo anywhere. Photos sync only to your own private account. Optional AI features, like product recommendations, send a photo only when you choose to use them. 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: Does scanning upload my face to an AI server? A: No. Your four scores are measured on your iPhone. Photos sync to your own private account. Optional AI features send a photo only when you choose to use them. 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: [email protected]
Ratings & reviews
5.0
13 ratings
What’s new
Version 1.3.1 · Updated August 14, 2026
Trace grew a lot in this update. - Scan your left and right profile, not just the front. Pick the angle right on the Today screen - Trace now speaks French, German, Spanish, and Simplified Chinese - Full iPad support, no more iPhone only screen - Yapping upgrades: check off each product as you talk, a streak calendar, and a satisfying sound for every check-in - Past tests moved into Routine, so products and results live in one place - Buddy chat looks cleaner: new message colors and proper text formatting - Fixed a crash when talking to Buddy with the microphone - Fixed Apple sign-in, rescan slowdowns, and a tutorial that could get stuck - Today screen polish: banner buttons respond on the first tap
App privacy
The developer, Siyuan Liang, reported these privacy practices to Apple.
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Identifiers: User ID, Device ID
- Usage Data: Product Interaction
- Health & Fitness: Health
- Location: Coarse Location
- Contact Info: Email Address
- User Content: Photos or Videos, Other User Content
Used for: Analytics, App Functionality
Alternatives to Trace: Acne & Skin Tracker
Looking for apps like Trace: Acne & Skin Tracker? Here are 6 similar apps on the App Store. The highest rated is Radien: AI Skin Analysis (4.8/5), and all 6 are free to download.
-
Skinsign: Acne Coach & Scanner
4.6
-
Skin Health Tracker - MyGlow
-
Acne Tracker: Skin Journal
-
Radien: AI Skin Analysis
4.8
-
Puffin: Acne Tracker
4.6
-
LumeSkin: AI Dermatologist
4.8
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Trace: Acne & Skin Tracker | 5.0 / 5 (13 ratings) | Free | August 14, 2026 | |
| Skinsign: Acne Coach & Scanner | 4.6 / 5 (216) | Free | Sep 6, 2026 | Compare |
| Skin Health Tracker - MyGlow | – | Free | Aug 2, 2026 | Compare |
| Acne Tracker: Skin Journal | – | Free | May 25, 2026 | Compare |
| Radien: AI Skin Analysis | 4.8 / 5 (4) | Free | Aug 24, 2026 | Compare |
| Puffin: Acne Tracker | 4.6 / 5 (118) | Free | Sep 6, 2026 | Compare |
| LumeSkin: AI Dermatologist | 4.8 / 5 (19) | Free | Oct 11, 2026 | Compare |