SoapCalc.pro is a free soap lye calculator for handmade soap makers. 🧮 What it does: - NaOH, KOH & dual-lye calculations - 150+ oils with fatty acid profiles - Soap quality predictions - Mold volume & fragrance calculator - Works on mobile, no app needed 💡 Why different: - No sign-up, no ads, completely free ✨ Pro version at app.soapcalc.pro — custom SAP, AI recipe optimizer, cost-aware blending & SOP export.