Trace vs YouCam Skin
YouCam Skin gives you a single AI rating today. Trace runs that scan every day for thirty days against your own baseline. Different time horizons answer different questions.
Single moment versus a trend
YouCam Skin (from Perfect Corp) scans your selfie and returns an AI rating across several aesthetic categories. It is fast, polished, and made to show you a snapshot of right now. Trace scans your face every day, holds capture conditions constant, and shows you the slope of how those metrics are moving across a thirty day window. The first answers 'how does my skin look today.' The second answers 'is my routine moving the dial.'
What each measures
YouCam Skin produces a composite skin score plus aesthetic ratings (wrinkles, spots, firmness, dark circles, oiliness, etc.). The output is comparative to a model, not necessarily to your own past. Trace measures four metrics rooted in dermatology, each with its own trend line:
- Acne: lesion-level detection (comedone, papule, pustule, nodulocystic) plus IGA grade 0 to 4.
- Redness: Lab a* color quantification, the same channel research uses.
- Pores: pore-level texture across forehead, cheeks, and nose.
- Spots: luminance evenness and post-inflammatory marks.
Standardization matters more than the model
Most single-scan rating apps quietly fail because the lighting in your bathroom changes more than your skin does. A photo taken near a window at 9am is not comparable to a photo taken under bathroom warm light at 11pm. Trace forces a flash on every scan, prompts a fixed distance window, and uses the 12 MP front camera so that day 1 and day 30 are directly comparable. Without standardization, your trend is a graph of the room lighting, not your skin.
Commercial intent
YouCam Skin is built around partnerships with brands and retailers (try-on, AR makeup, retail apps). It is a polished consumer surface for the beauty industry. Trace is independent, free, with no product line and no upsell. Different commercial models, different answers.
Side by side
| YouCam Skin | Trace | |
|---|---|---|
| Core unit | Single-scan AI rating | 30 day trend across 4 metrics |
| Acne detail | Composite acne score | Comedone / papule / pustule / nodulocystic + IGA |
| Redness | AI rating | Lab a* channel measurement |
| Standardized capture | Selfie | Forced flash, distance window, 12 MP |
| Reference | Population model | Your own baseline |
| Brand partnerships | Beauty industry integrated | Independent, no product line |
| Pricing | Free with premium tiers in some apps | Free, no subscription |
| Photo processing | Cloud | On-device |
Which to pick
YouCam Skin if you want a fast snapshot, AR makeup try-on, or a polished beauty experience. Trace if you have a specific product you are testing and you want a daily measurement of whether your skin is actually moving over the next month. Same broad category, different jobs.
Disclosure: Trace is the free iOS app described above. The YouCam Skin comparison is based on public features as of mid-2026.
Frequently asked
Is Trace a YouCam Skin alternative?
They both AI-analyze a selfie but they answer different questions. YouCam Skin gives a single-scan rating in seconds. Trace gives a 30-day trend on four specific metrics, with standardized capture so days are comparable. Different time horizons, different jobs.
Does Trace work like Perfect Corp apps?
Trace shares the broad category (AI on a face image) but it is independent, brand-neutral, and built around longitudinal measurement rather than single-moment beauty scoring.
Is Trace free?
Yes. Free on the iOS App Store, no subscription, no upsell.