Every SlipperSkin guide
19 guides across 5 aisles. Each prints the date its figures were read on makers' own pages and the date it will be read again.
Ingredient checker apps
All Ingredient appsDo ingredient apps agree?
Twenty best sellers on five databases: where the verdicts split, and why.
Best ingredient checker app
Ten apps by the question each one answers, and what every score is built on.
Ingredient files
Sixty-six ingredients against the California statute, the EU regulation, FDA’s list and EWG, each with its sources.
EU bans vs FDA’s list
The EU’s Annex II against FDA’s eleven named entries: which overlap, and what the gap does and does not mean.
Banned ingredients: California, EU, FDA and EWG
What each regulator bans, how the lists nest, and how EWG scores the banned ingredients it lists.
Yuka vs Think Dirty vs EWG
Three rules for one question, drawn on the same ingredient list, and who pays each.
Who pays the ingredient apps?
Subscriptions, brand fees, ads and affiliate links, app by app, and what a brand can and cannot buy.
Think Dirty price: web vs App Store
Every plan on both price lists, and the month when monthly billing overtakes the rest.
SkinSort vs INKEEDecoder
The same ingredient numbers, different product verdicts, on twenty real products.
AI skin analysis
All Skin analysisHow accurate are AI skin analysis apps?
Repeatable is not the same as right: what the makers publish, and what an independent test found.
Best AI skin analysis app
Ten scanners by what you want from them, who they sell, and what happens to your selfie.
Try-on and shade matching
All Makeup techClean labels and retailers
All Clean and retailClean at Sephora vs Ulta Clean
Two banned lists drawn side by side, and the same products sealed at one store and not the other.
Is Sephora or Ulta cheaper?
Every same-size pair we could read at both stores, and where the real difference is.
Are beauty dupes the same?
Fifteen famous dupes, ingredient by ingredient and price per gram.
Does SkinSort find the dupes the press names?
Nine famous originals looked up on its dupe finder: where the named dupe lands, and what its percentages are made of.
LED masks and beauty devices
All DevicesAre LED face masks FDA approved?
Twenty devices read against their own 510(k) filings: what is cleared, and where the page says something else.
Best LED face mask
Price, wavelengths, treatment time and clearance for every major mask.
Best microcurrent device
What each device was cleared for, what it costs, and how thin the evidence is.
LED mask apps compared
What each companion app controls, its rating, and its privacy label.