Smart Product Comparator
Compare two products side by side: paste or photograph each ingredient list for plain-English notes and gentle flags. Signed in? Trigger Detective can help find patterns across products you’ve reacted to.
Sign in to check results against your personal allergy profile.
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How the product comparator works
Switching products, or deciding between two you already own? Paste each product's ingredient list — or upload a photo of the label — and AllerNote reads both, names every ingredient in plain English, and lines them up side by side. You see which ingredients the two share, which are unique to each, and which are common irritants or fragrance allergens worth a second look.
Compare cosmetic formulas side by side
Two products can look almost identical on the front of the bottle and be very different underneath. The comparator surfaces those differences: a "fragrance-free" claim that still hides parfum, a gentler cleanser that swaps a harsh sulfate for a mild surfactant, or a moisturiser that adds a preservative you react to. Sign in and add your allergens to highlight any ingredient in either product that matches your own profile.
Frequently asked questions
Is the product comparator free?
Yes. Compare any two products by pasting or uploading their ingredient lists — no account needed. Sign in to also check both against your saved allergens.
What can I compare?
Any two cosmetics with printed ingredient lists — moisturisers, cleansers, sunscreens, serums, shampoos, and more. Paste the INCI lists or upload a photo of each label.
What does the comparison show?
Plain-English notes on each ingredient, which ones the two products share, which are unique to each, and any common irritants or fragrance allergens flagged in either formula.
Can it tell me which product is safer for me?
Sign in and add your allergens, and the comparison highlights any ingredient in either product that matches your profile — so you can see at a glance which is the better fit for your skin.
Do I need to sign up?
No. The side-by-side comparison works anonymously. A free account adds personal allergen matching and saved history.