Soap Lye Calculator - Trace
Batch Tracker & Cure Journal
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Craft better soap with precision tools.
Track, calculate, and perfect every bar of soap you make.
Trace is the precision toolkit for cold process soapmakers - from your first batch to your thousandth. Log every batch, calculate exact lye amounts, track cure progress, and build a library of proven 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 recipe
- Filter by status: draft, proven, or production
- Access a curated starter recipe 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 recipes and formulas
- Unlimited batch logs and history
- 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 soap for personal use, for gifts, or to sell at farmers markets, Trace keeps your formulations organized, your cure times tracked, and your best recipes saved forever.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Karol Jaworski, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Karol Jaworski
- Size
- 3.7 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 17 or later.
- iPhone
Requires iOS 17 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Trace Pro $39.99
- Trace Pro $39.99
- Trace Pro $4.99
- Copyright
- © 2026 Karol Jaworski