Free · No sign-up · Works in your browser

Your serums might be
fighting each other

Instantly check for ingredient conflicts before you layer. Built by a skincare nerd, powered by science — and completely free.

🔬 Try it now ☕️ Support & unlock more

🧪 Live Demo — Try it right here (12 actives)

Retinol Glycolic Acid (AHA) Salicylic Acid (BHA) Vitamin C Niacinamide Benzoyl Peroxide Copper Peptides Gluconolactone (PHA) Azelaic Acid Hyaluronic Acid Ceramides Matrixyl (Peptides)

100% private

Features

Everything you need to layer safely

From ingredient analysis to smart recommendations, SkinClash covers every step of your routine check.

1-Click Conflict Detection

Select any ingredients from your current routine, hit "Check", and instantly see risky combinations with severity ratings — High, Medium, or Low. No more late-night Googling.

Science-Backed Rules

9 built-in conflict rules based on dermatological research. Understand why ingredients clash, not just whether they do.

Custom Ingredients

Don't see your product? Unlock custom ingredient input and add any active to test against our database.

Works Anywhere

Mobile-optimized. Use it in the bathroom, at Sephora, or while doom-scrolling skincare TikTok at 2 AM.

No app install
No account needed
Works offline

100% Private

All checks run entirely in your browser. No data is ever collected, stored, or sent anywhere. Your routine stays yours.

Smart Scheduling Tips

When ingredients conflict, we don't just flag it — we tell you exactly how to use them safely: split by AM/PM, alternate days, or wait between applications.

Built-in Rules

9 ingredient conflicts detected instantly

Based on dermatological research. Updated as new data emerges.

Ingredient A	Ingredient B	Risk	Recommendation
Retinol	Glycolic Acid (AHA)	High	Use on alternate nights
Retinol	Salicylic Acid (BHA)	High	Separate by day/night routine
Retinol	Benzoyl Peroxide	High	Avoid layering entirely
Vitamin C	Niacinamide	Medium	Wait 10-15 min between applications
Vitamin C	Retinol	Medium	Vitamin C in AM, Retinol in PM
Copper Peptides	Vitamin C	Medium	Alternate between AM and PM
Niacinamide	AHA	Medium	Apply at different times of day
AHA	BHA	Medium	Choose one or use on different days
Benzoyl Peroxide	Vitamin C	Low	Separate by time of day if tolerated

Unlock

Support SkinClash, unlock custom ingredients

Built-in ingredient checks are free forever. Unlock custom ingredient input to test any product.

🧴

$2.99

Unlocks for 15 days

All built-in ingredients
Custom ingredient input
Conflict detection
Smart scheduling tips

Support $2.99

Questions? We've got answers.

Everything you need to know about SkinClash and ingredient safety.

Is SkinClash really free?

Yes! All built-in ingredient checks are completely free, no sign-up required. You only pay if you want to unlock custom ingredient input — and even then, it's a one-time support contribution that unlocks access for weeks.

How accurate are the conflict rules?

Our conflict rules are based on published dermatological research and widely accepted skincare science. We focus on well-documented interactions between active ingredients. However, everyone's skin is different — always patch test and consult a dermatologist for personalized advice.

Is my data collected?

Never. All ingredient checks run entirely in your browser using JavaScript. No data is ever sent to a server, stored, or collected. SkinClash is 100% private by design.

Can I add ingredients not in the list?

Yes! Custom ingredient input is available when you support SkinClash. Once unlocked, you can type any ingredient name and test it against our built-in database. The unlock lasts 15, 30, or 60 days depending on your support level.

What payment methods do you accept?

We process payments securely through Creem, which accepts all major credit/debit cards (Visa, Mastercard, Amex, Discover), Apple Pay, Google Pay, and various local payment methods depending on your country.

Your serums might be fighting each other