Soap Lye Calculator - Trace

Karol Jaworski · Lifestyle

Free

Chart standing · US

Not currently charting in this storefront.

What changed · US

Listing changes AppTracker has observed for this app in this storefront — new versions, price moves, rating shifts, and store copy.

Aug 26, 2026
New version 1.37 → 1.40

Two important fixes based on customer feedback: • Recipe names, batch notes, and text you type into any field are now clearly visible in both light and dark mode • A "Done" button now appears above the number keypad so you can dismiss the keyboard and get back to saving Thank you for the reports — please keep them coming.

About

Calculate lye, log every batch, and never lose a great soap recipe. Trace is the precision toolkit for cold process and hot process soapmakers. Whether you're crafting your first lye soap or refining a proven formula, Trace puts accurate calculations, a complete soap log, and organized recipes all in one place. LYE CALCULATOR - Calculate NaOH or KOH amounts for any oil blend - 40+ oils with accurate SAP values built in - Adjust superfat percentage and water-to-lye ratio - See predicted soap properties before you pour BATCH LOGGING - Log every cold process or hot process batch - Visual cure progress tracker with days remaining - Capture batch ratings, notes, and evaluations - Know exactly when each batch is ready to use RECIPE LIBRARY - Save and refine your custom soap formulas - See predicted soap properties for every soap recipe - Filter by status: draft, proven, or production - Access a curated starter collection CURE TRACKING - Automatic cure countdown for every batch - Ready badge when full cure time is complete - Visual progress rings showing cure percentage - Never sell or use under-cured soap again SOAP PROPERTIES - Predict hardness, cleansing, conditioning, and lather - Bubbly vs. creamy lather balance at a glance - Iodine and INS values for stability - Property bars for each recipe and batch TRACE PRO - UNLOCK YOUR FULL SOAP STUDIO Trace Pro gives serious soapmakers the complete toolkit: - Unlimited soap recipes and formulas - Unlimited entries in your soap log - All 7 soap property predictions - Full starter recipe library (30+ proven recipes) - Property prediction charts before you pour Free tier includes 5 saved recipes and 10 batch logs - perfect for getting started. Whether you make lye soap for personal use, for gifts, or to sell at farmers markets, Trace keeps your formulations precise, your soap log organized, and your best recipes saved forever. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

What's new · 1.40

Two important fixes based on customer feedback: • Recipe names, batch notes, and text you type into any field are now clearly visible in both light and dark mode • A "Done" button now appears above the number keypad so you can dismiss the keyboard and get back to saving Thank you for the reports — please keep them coming.

Details

ReleasedMay 2026
UpdatedJul 2026
Version1.40
Size3.7 MB
RequiresiOS 17 or later
Age rating4+
LanguagesEnglish
PriceFree
Categories LifestyleUtilities
Bundle IDcom.ceanic.Trace