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All Skincare Tools & Calculators

25 catalogued

Every free skincare calculator, checker, quiz and routine builder in the catalog — each one measured, cited, and built for people who read the back of the bottle.

TOOL-008 · CALCULATOR · UV-INDEX

SPF Duration Calculator

SPF 30–50+UV index~15s

SPF, skin tone, and today's live UV index → the real minutes before you need to reapply. Based on burn time, not the bottle's marketing.

TOOL-009 · CHECKER · UVA-UVB

SPF & PA+++ Decoder

UVA/UVBPA system~20s Coming soon

Decode SPF, PA+++, PPD and broad-spectrum labels into plain protection levels — so you know what UVA and UVB coverage you are actually getting.

TOOL-003 · CALCULATOR · DOSAGE

Sunscreen Amount Calculator

Two-finger ruleBy body area~20s Coming soon

Most people use a quarter of the sunscreen they need. Get the exact amount in fingers, grams or ml for your face and body so your SPF actually performs.

TOOL-003 · CHECKER · CONFLICT

Ingredient Conflict Checker

12 activesSourced~45s Coming soon

Add retinol, vitamin C, niacinamide, acids — whatever's in your routine — and see what clashes, what's safe, and the exact order to layer it.

TOOL-005 · CHECKER · STRENGTH

Retinol Strength Ladder

Esters → TretBy experience~30s Coming soon

Match your skin type, experience and goals to a retinoid and percentage — from gentle retinyl esters up to prescription tretinoin, with no guesswork.

TOOL-006 · CHECKER · COMPARE

Vitamin C Form Comparator

6 formsStability~30s Coming soon

Compare L-ascorbic acid, SAP, MAP, THD ascorbate and more on stability, strength and irritation — and find the form that suits your skin and budget.

TOOL-007 · CHECKER · POTENCY

AHA/BHA Percentage Guide

Glycolic/SalicylicpH-aware~30s Coming soon

See what a given AHA or BHA percentage actually does at its pH, how it compares across acids, and how often it is safe to use for your skin.

TOOL-008 · CHECKER · pH-AWARE

pH Compatibility Checker

pH rangesLayer-safe~30s Coming soon

Vitamin C, acids and niacinamide each want a specific pH. Check whether your actives are compatible layered together — or need to be split across routines.

TOOL-009 · CHECKER · DOSAGE

Niacinamide Dose Finder

2–10%By concern~25s Coming soon

Find the niacinamide percentage backed by evidence for your concern — oil control, hyperpigmentation or barrier support — without tipping into irritation.

TOOL-010 · BUILDER · SEQUENCE

Skincare Layering Order Builder

AM/PMWait times~60s Coming soon

Drop in your cleansers, actives, moisturisers and SPF and get the correct skincare routine order — morning and night — with wait times and conflicts flagged.

TOOL-011 · BUILDER · SCHEDULE

Skin Cycling Planner

4-night cycleBy tolerance~45s Coming soon

Build a skin cycling routine that rotates exfoliation, retinoid and recovery nights around your actives and skin tolerance — no overlap, no over-exfoliation.

TOOL-012 · CHECKER · REDUCE

Routine Simplifier

De-dupeConflict-aware~60s Coming soon

Have too many skincare products? List what you use and see which steps are redundant, which conflict, and the minimal routine that still hits your goals.

TOOL-013 · BUILDER · STARTER

Beginner Routine Builder

4 stepsBy skin type~60s Coming soon

New to skincare? Answer a few questions about your skin and goals and get a simple, complete beginner routine — cleanser, treatment, moisturiser and SPF.

TOOL-014 · CHECKER · OCCLUSIVE

Slugging Protocol

OcclusivesWhat to avoid~25s Coming soon

Check if slugging suits your skin type and routine, what to apply underneath, what to avoid sealing in, and how often to do it without clogging pores.

TOOL-015 · CHECKER · pH-AWARE

Purging vs. Breakout Checker

RetinoidsAHA/BHA~30s Coming soon

Enter your actives, your timeline, and where it's flaring. Find out whether your skin is purging on schedule — or reacting and needs you to stop.

TOOL-016 · CHECKER · BARRIER

Skin Barrier Damage Checker

Symptom-basedRecovery plan~40s Coming soon

Tight, stinging, flaky or suddenly reactive skin? Answer a short set of questions to see whether your skin barrier is damaged and what to stop doing now.

TOOL-017 · BUILDER · PROTOCOL

Hyperpigmentation Protocol

PIE/PIH/melasmaSPF-led~50s Coming soon

Identify your type of hyperpigmentation — PIE, PIH or melasma — and build an evidence-based protocol of actives and SPF to fade it without irritation.

TOOL-018 · CHECKER · CLASSIFY

Acne Type Identifier

By lesionActive match~35s Coming soon

Whiteheads, cysts, blackheads or hormonal flares all need different actives. Identify your acne type and see the ingredients with evidence behind them.

TOOL-019 · CHECKER · MALASSEZIA

Fungal Acne Checker

MalasseziaTrigger list~30s Coming soon

Uniform itchy bumps that ignore acne treatment may be fungal acne (malassezia). Check the signs and see which ingredients to use — and which feed it.

TOOL-020 · QUIZ · PROFILE

Skin Type Quiz

Baumann-style10 questions~90s Coming soon

Oily, dry, combination or barrier-damaged pretending to be oily? A short quiz pins down your real skin type so the rest of your routine is built right.

TOOL-021 · CALCULATOR · VALUE

Cost Per ml Calculator

Per ml/ozCompare any~15s Coming soon

Bigger bottles are not always cheaper. Enter price and size for any products and compare true cost per ml to find the best value skincare for your money.

TOOL-022 · CALCULATOR · SHELF-LIFE

Product Expiry Tracker

PAO symbolActive decay~20s Coming soon

Find out when your skincare expires from its PAO symbol and opening date — and flag the actives like vitamin C and retinoids that degrade fastest.

TOOL-023 · CALCULATOR · BUDGET

Skincare Budget Allocator

Priority-ledMonthly~30s Coming soon

Set a monthly budget and this allocator splits it across the products that actually move the needle — SPF and treatments first, nice-to-haves last.

TOOL-024 · BUILDER · SCHEDULE

Retinol Introduction Schedule

Week-by-weekTolerance-led~40s Coming soon

Retinol for beginners, done right: a week-by-week schedule that ramps your frequency to your skin’s tolerance so you build to nightly without wrecking your barrier.

TOOL-025 · CHECKER · INCI-MATCH

Dupe Finder Guide

INCI-ledActive match~40s Coming soon

Learn how to read an INCI list to find real skincare dupes — matching the actives and concentration that matter, not just a similar-looking bottle.