Your skin is unique.
Your routine should be too.
Answer three quick questions about your skin type, concerns, and goals — and we'll build a personalised AM/PM routine, flag ingredient conflicts, and tailor every recommendation on this site to you.
Already have products? Decode an ingredient list or audit your whole routine
The 6 golden rules of skincare click or tap to read ▾
Routine Builder
Build Your Routine
Your routine — or stack — is the ordered set of products you apply each morning and evening. Toggle steps on or off, click any ingredient tag to learn what it does, and save when you're happy. We'll flag ingredient conflicts live as you build.
Routine Time
Build your routine above and we'll instantly flag any ingredient conflicts, cautions or great pairings.
No known conflicts between the ingredients in your current routine.
Stay in the Know
Get your routine delivered.
We'll email you your personalised stack plus a short weekly note on new ingredients and research. No spam, unsubscribe anytime.
The Most Comprehensive Skincare & Longevity Reference
Skin Stacker Glossary
A complete reference covering every ingredient, technique, skin condition, label term, longevity concept and wellness principle you need to know. Click any card to open the full definition.
Ingredient Spotlight
Key actives at a glance — click to explore
Ingredient Decoder
Decode any product
Search, scan or paste a skincare product to reveal what's actually in it — and get a plain-English breakdown of every active ingredient. Decode two or more and we'll flag any conflicts in your stack.
🍄 New Tool
Fungal Acne Check
Paste any ingredient list to find out if it's safe for fungal acne (Malassezia folliculitis). We check against a comprehensive list of known FA triggers — fatty acids, esters, and fermented ingredients that feed Malassezia yeast.
Paste the full INCI list from the product label or the brand's website. Commas or line breaks both work.
🔗 Interactive Tool
Ingredient Interaction Map
Select ingredients to see how they interact — as a colour-coded matrix. Click any cell for the full story: why they clash or pair well, the mechanism, and what to do about it.
Reaction Triage
Why is my skin reacting?
Answer a few questions about what you're seeing and what you've been using. We'll cross-reference the active ingredients in your routine and rank the most likely causes — purging, irritation, allergy, fungal flare, true breakout, or something that needs a dermatologist's eyes.
1. What does the reaction look like?
Pick the closest match — it's fine if you're unsure.
2. Where is it showing up?
3. Any of these feelings? (pick all that apply)
4. How long has this been going on?
Answer all 4 questions to continue
5. Have you started anything new recently?
6. Which actives are in your current routine?
Tick any you're using right now. We use this to weight the likely cause — e.g. purging only happens with specific ingredients.
7. Are you in any of these situations? (optional)
Answer questions 5 and 6 to continue
Ingredient Efficacy Timeline
See exactly when each active in your routine starts working — week by week, from first use to full results.