Soap Calculator: Lye & Recipe

Saponification & Cure Tracker

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

The soap maker's studio: exact lye math, cure timers in your Dynamic Island, FDA-ready labels, batch records, and AI that turns recipe photos into batches. All offline. Soap Calculator: Lye & Recipe is the lye and soap calculator built for handmade soap makers - cold-process, hot-process, melt-and-pour, and liquid soap. Type your oil blend, batch size, water and superfat percentages, and the app returns the exact lye weight (NaOH for solid bars, KOH for liquid soap), a water weight, a saponification check, predicted bar properties, and a full fatty-acid profile - before you ever pour. THE CALCULATOR - 200 oils, each with a verified saponification value, fatty-acid breakdown, and INCI saponified name - NaOH and KOH - solid bars or liquid soap - Superfat 0 to 15 percent, water at any percentage of oil weight - Predicted bar properties: hardness, cleansing, conditioning, bubbly and creamy lather, plus iodine and INS - A fatty-acid blend ribbon that shifts in real time as you adjust the recipe SAFETY FIRST Lye is caustic. Every screen that shows a lye number frames it as a safety calculation - the hazard, the protective equipment, the safe-handling sequence - in a dedicated safety-red callout. LABELS THAT SELL - FDA-style INCI ingredient labels - Avery 5160 print sheets - 30 labels per page - Lot numbers and manufacture dates on every label - Export as PDF, ready for the printer BATCHES AND CURE TRACKING - Save unlimited recipes and batches with notes and photos - A cure timer that lives in the Dynamic Island and on your Lock Screen - Home Screen widgets for your active batch - A notification the morning a batch is ready ON-DEVICE AI The optional AI label copywriter uses Apple's on-device models - your recipes and notes never leave your iPhone. PRIVACY BY DESIGN No accounts. No backend. No analytics. No tracking. No ads. A Privacy Manifest declares zero data collection - everything lives on your device. Privacy Policy: https://pandataps.com/legal/trace-privacy.html Terms of Use: https://pandataps.com/legal/trace-terms.html

  • 4.0
    out of 5
    8 Ratings

ADDITIVES Clays, milks, oatmeal, micas and your own ingredients. They sit in the recipe, price into your cost per bar, and come off your shelf the moment you pour. MILKS AND LIQUIDS Goat milk, coconut milk and brewed coffee dose against the water they replace, not the oils. COST PER BAR Labels, packaging, labor, overhead and every ingredient in one honest number you can price against. PRINTING Recipe sheets, batch worksheets and one-page GMP batch records. VERSIONS Save a formula before you change it and compare any two side by side. Duplicate one and the additives, fragrance and costing come with it. TRACEABILITY Supplier, lot, IFRA ceiling and cost, frozen the day you pour and never rewritten. UNITS Ounces, grams or pounds, held on every screen, every printed sheet and every batch record. 24 MORE OILS Canola among them. Search for one the catalog does not carry and it offers to add it.

The developer, Panda Taps LLC, 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 Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    • Panda Taps LLC
    Size
    • 10.8 MB
    Category
    • Lifestyle
    Compatibility
    Requires iOS 18.6 or later.
    • iPhone
      Requires iOS 18.6 or later.
    • iPad
      Requires iPadOS 18.6 or later.
    • Mac
      Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.6 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    • Trace Pro Yearly $19.99
    • Trace Pro Lifetime $39.99
    • Trace Pro Monthly $3.99
    Copyright
    • © 2026 Panda Taps LLC