SoapDIY-Soap Recipe Calculator

Rebuilt in SwiftUI: instant lye calculation, quality radar, batch log with cure reminders, and 59 oils.

The best calculator for making handmade soap. Enter your oil recipe and instantly get the lye, water, and quality metrics you need.

Key features • Instant saponification: solid soap (NaOH) and liquid soap (KOH), by ratio or weight • Correct superfat: automatically applied to the lye amount (fixes a common mistake) • Flexible water settings: lye concentration / water-to-lye ratio / % of oils, default 33% • KOH purity: liquid soap auto-converts to the real amount by purity (default 90%) • Quality radar: hardness, cleansing, conditioning, bubbly, creamy — with recommended ranges • 59 built-in oils with verified SAP and fatty-acid data • Custom oils: add your own oils and fatty-acid profiles • Recipe management: save, search, share, export to PDF • Batch log: record each batch with photos and get an automatic cure reminder • Dark mode, Dynamic Type, and an iPad two-column layout

Safety Wear goggles and gloves and keep the area ventilated when handling sodium/potassium hydroxide. This app is for calculation reference; always follow proper safety procedures.