About this app
Design perfect soap recipes in seconds. Soap Calculator is a professional, offline lye calculator designed for handmade soap makers and hobbyists who want precise measurements without complicated setups. Choose your base oils, set your batch size, and instantly get the exact NaOH or KOH required. As you tweak your ingredients, watch your soap's hardness, cleansing, lather, INS scoring, and total cost update in real-time. Core Tools & Features: Real-time evaluation, multi-dimensional scoring, 100% offline usage with local storage, flexible units, recipe saving & sharing, classic templates, and a built-in database of over 170 oils. Basic features are free forever, with a one-time Pro unlock (no ads or subscriptions).
Latest release
What’s New
1. New Smart Optimize: one-tap adjustment of oil ratios to improve your recipe score and characteristics 2. New water references: water as % of oils on the results page and lye concentration in settings — see water amount in multiple ways 3. New rancidity (DOS) risk assessment to help prevent soap spoilage
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Sep 3, 2026 · 4:24 AM Free
Screenshots
