About Larewa
Free, research-based calculators for your skin, hair, and cosmetic routines.
Our Mission
We started Larewa to give people clear, practical skincare guidance without the sales pitch. Navigating thousands of products, conflicting social media trends, and expensive consultations makes finding a good routine frustrating.
We built a library of free tools based on published dermatology research and cosmetic chemistry. Whether you want to check your skin type, calculate SPF reapplication intervals, or analyze ingredient conflicts, Larewa gives you direct answers without pushing products.
Our Story
Larewa started in 2024 as a project between software developers and cosmetic chemists. We were frustrated by how much everyday skincare advice is tied to sponsored endorsements or locked behind paid apps.
We wanted a clean website where anyone could calculate sunscreen reapplication times, check an ingredient list, or build a simple routine without being directed to a $100 serum.
What began as a simple SPF calculator grew into a collection of more than 30 tools used by thousands of readers every month.
Our Science-Backed Methodology
Skincare is biology, not magic. Every tool on Larewa is built around established dermatological frameworks and peer-reviewed research:
Dermatological Standards
We structure our routines around clinically validated principles, using the Fitzpatrick Phototype scale for UV assessments and the Baumann system for oil and sensitivity analysis.
Ingredient Safety Analysis
Our ingredient guides reference published databases from the Cosmetic Ingredient Review (CIR) and European Commission scientific committees, focusing on concentration limits and proven safety.
What We Stand For
Independent and Objective
Every tool is built on verified dermatology principles. We do not accept brand sponsorships or paid product recommendations.
100% Free Access
All 30+ tools are free. There are no paywalls, accounts, or credit card requirements.
Built for All Skin Types
Calculations account for the full spectrum of Fitzpatrick phototypes, skin sensitivities, and hair textures.
Client-Side Privacy
We do not store your quiz responses or routine data on our servers. Calculations run locally in your browser.
⚠️ Important Disclaimer
The content and tools on Larewa are for informational and educational purposes only. They do not constitute medical, diagnostic, or dermatological advice, and are not a substitute for professional medical care. Always consult with a licensed dermatologist or healthcare professional before beginning any new treatment or skincare regimen, especially if you have chronic skin conditions.
Get in Touch
Have feedback, found an error in one of our calculators, or want to collaborate? We would love to hear from you.
✉️ Contact Us