INCIDecoder explains the chemistry.
ClearSkin shows what it's doing to you.
INCIDecoder is an excellent chemistry reference for cosmetic ingredients. ClearSkin sits one layer deeper, logging the ingredients in your actual routine alongside your habits, then surfacing the ones that line up with your breakouts. Free, on-device, no account.
Free. No account required.
Chemistry alone is not the answer
INCIDecoder tells you niacinamide is anti-inflammatory in general. ClearSkin tells you whether the niacinamide product in your routine is actually doing anything for your skin, based on weeks of your own log.
Routine, ingredients, and outcomes
You log the products and habits. ClearSkin keeps the chemistry-to-breakout connection visible across weeks, not paragraphs, so a pattern shows up as data and not as a guess.
On-device, no account, free
Everything stays on your phone. No sign-up, no community profile, no cloud sync, no paywall. You can use the entire app offline and delete it without leaving anything behind on a server.
Built around the research
Categories and prompts are based on what peer-reviewed studies show actually drives acne, not what helps a brand sell product or what an encyclopedia entry summarizes.
Frequently asked questions
Should I use INCIDecoder or ClearSkin?
Use both. INCIDecoder is the chemistry reference, the place to go when you want to understand what an ingredient is and what it generally does. ClearSkin is the personal layer, tracking the ingredients you actually apply and tying them to your breakouts. Look up the chemistry on INCIDecoder, then watch the effect on your skin in ClearSkin.
Does ClearSkin replace ingredient lookups?
No. ClearSkin is not an encyclopedia, and INCIDecoder does that job well. What ClearSkin does is log what is in your routine and tie usage to outcomes, so you can tell which of those ingredients matter for your skin specifically. The two tools answer different questions.
Is ClearSkin free?
Yes. There is no paid tier, no in-app purchase, no subscription. Every feature is available from day one. ClearSkin is designed to be used until you have your answer and then closed, not to keep you paying month after month.
Is my data private?
Yes. Everything stays on your phone. There is no account, no sign-up, no cloud sync, no telemetry, and no community profile. You can use the app entirely offline, and deleting it removes your log completely because nothing was ever stored on a server.
- Static ingredient encyclopedia
- What an ingredient does in general
- No tracking of your actual routine
- No correlation with breakouts
- Web-only, account optional
- Free with premium tier
- Logs ingredients in your real routine
- What an ingredient does to your skin
- Daily log of products and habits
- Personal correlation with breakouts
- On-device iOS app, no account
- Free, no paid tier
Pair the chemistry reference with the personal log.
Use INCIDecoder to understand what each ingredient is. Use ClearSkin to find out which ones your skin is actually responding to. Free on iOS.
Free. No account required.