# Sus

> Sus is a skincare ingredient-checker and scanner app for iPhone. Point the
> camera at a label or barcode; Sus reads the INCI list, checks names it is
> unsure of against about 33,500 ingredient names from the EU's CosIng
> database, and grades the product against the user's own Skin ID rather
> than a universal "toxic ingredient" score. Free to
> download. The first scan on each iPhone needs no account; sign-in is
> required from the second scan, and the first three scans are free.

## App

- [Sus on the App Store](https://apps.apple.com/app/id6769767581): Download page. Free to download; the first scan on each iPhone needs no account, and the first three are free.
- [Homepage](https://getsusapp.com/): Product overview, real in-app screenshots, how grading for a Skin ID works, a section on sensitive skin, and an FAQ covering label-reading, sensitive skin, how accurate ingredient checkers are, ingredient order, PDRN, non-comedogenic claims, reformulation, and price.
- [Homepage in Spanish](https://getsusapp.com/es): The same homepage in Spain Spanish.

## Answers

- [How do I check whether a skincare product is right for my skin?](https://getsusapp.com/is-this-skincare-product-right-for-my-skin): Reading the back of the bottle for your own skin — what EU Regulation 1223/2009 Article 19 and US 21 CFR 701.3 require on the list, which lines carry weight, and the concentrations no label ever prints.
- [How Sus works](https://getsusapp.com/how-it-works): Three steps: show Sus the ingredient list (or scan the barcode, or search by name), Sus reads it and asks for another photo when the label is too blurry to read, then grades the list for the user's Skin ID. Where the lists come from: the ingredient list printed in the user's photo (if the photo also shows the barcode, Sus looks that up first); for a barcode, Sus's product bank then Open Beauty Facts; lists found on the web aren't graded until a person has checked them; when Sus is unsure of a name, it checks it against about 33,500 ingredient names from CosIng. Spanish: https://getsusapp.com/es/how-it-works
- [How can I tell if a skincare product was quietly reformulated?](https://getsusapp.com/was-my-skincare-product-reformulated): Where a silent formula change shows up, why the batch code cannot tell you, how the EU's Regulation 2023/1545 relabelling deadlines (31 July 2026 and 31 July 2028) muddy the signal, and the save-a-scan method that works.
- [Is fragrance bad for skin?](https://getsusapp.com/is-fragrance-bad-for-skin): Contact-allergy rates from the EDEN Fragrance Study and a 2024 Contact Dermatitis review, the EU's Regulation 2023/1545 fragrance-allergen labeling rule, and the fragrance-free vs. unscented distinction.
- [Does ingredient order matter on a skincare label?](https://getsusapp.com/does-ingredient-order-matter): How EU Regulation 1223/2009 and US 21 CFR 701.3 require descending-order-by-weight listing above 1%, and how to spot the 1% cutoff without a lab.
- [Is PDRN worth it?](https://getsusapp.com/is-pdrn-worth-it): The molecular-weight case against topical PDRN (50,000-1,500,000 daltons vs. the ~500-dalton skin-penetration threshold) and what to check on a PDRN serum label.
- [What does non-comedogenic mean?](https://getsusapp.com/what-does-non-comedogenic-mean): Why "non-comedogenic" has no FDA or EU legal definition, the rabbit-ear-assay origin of comedogenic ratings, and why those ratings don't reliably transfer to human skin.
- [Sus vs Yuka for skincare](https://getsusapp.com/vs-yuka): How Sus's profile-aware grading differs from Yuka-style universal hazard scoring.
- [Yuka alternatives for skincare](https://getsusapp.com/yuka-alternatives): The honest shortlist — Sus, HadaBuddy, Think Dirty, INCIDecoder, SkinSort, OnSkin — and who each one fits.

## Guides

- [PDRN vs retinol](https://getsusapp.com/guides/pdrn-vs-retinol): Comparing the two actives for an actual routine, with the retinoid literature linked.
- [Non-comedogenic sunscreen](https://getsusapp.com/guides/non-comedogenic-sunscreen): How to actually find one, given the claim is unregulated.
- [Non-comedogenic moisturizer](https://getsusapp.com/guides/non-comedogenic-moisturizer): What the claim hides and what to check instead.

## Legal

- [Privacy](https://getsusapp.com/privacy)
- [Terms](https://getsusapp.com/terms)
- [Support](https://getsusapp.com/support)