# Soap Calculator: Lye & Recipe — Saponification & Cure Tracker > Handmade soap calculator for lye, recipes, labels, and batch tracking. (iPhone/iPad app by Panda Taps LLC.) - Source: https://appshunter.io/ios/app/soap-calculator-lye-and-recipe/id6770798190 (this page in markdown: same URL + `.md`) - Developer: [Panda Taps LLC](https://appshunter.io/developer/1744998505) - Category: Lifestyle, Utilities - Price: Free with in-app purchases - Rating: 4.00/5 from 8 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 18.6 · 10 MB - Languages: American English - Released: 2026-05-26 - Data updated: 2026-08-29 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/soap-calculator-lye-and-recipe/id6770798190/reviews.md ## What is Soap Calculator? 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 ## Key features - Lye and water weight calculation - 200+ verified oils with saponification values - Predicted bar properties and fatty-acid profile - FDA-style INCI ingredient label generation - Batch saving with notes and photos - Cure timer with Dynamic Island and Lock Screen support - On-device AI for label copy ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Trace Pro Monthly | $3.99 | per month | | Trace Pro Yearly | $8.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Trace Pro Lifetime | $14.99 | one-time | ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/soap-calculator-lye-and-recipe/id6770798190/reviews.md ### 4/5 — Add additives list *2026-08-18* I’m really enjoying the app! The recipe calculator, batch tracking, curing notifications, inventory, and shopping list are incredibly useful. One feature I would LOVE to see added is an Additives section within each recipe. It would be great to add ingredients such as kaolin clay, sodium lactate, colloidal oatmeal, activated charcoal, sugar, salt, micas/colorants, milks, etc., with the option to enter the amount in grams, ounces, or as a percentage of oils. Even better if additives could be connected to inventory and recipe costing, so the app can calculate the true cost of each batch and automatically deduct them from stock when a batch is made. That would make this an amazing all-in-one app for small soap businesses. I would absolutely love to see this feature in a future update! **Developer response:** Thank you - and good news: this is exactly what version 1.7 is, and it is out now. Every recipe has an Additives section. Kaolin, sodium lactate, colloidal oatmeal, activated charcoal, sugar, salt, micas and milks, entered in grams, ounces or percent of oils. Milks, coffee and other liquids dose against the water they replace rather than the oils, so the lye math stays right. They are wired into inventory and costing, exactly as you described. A batch shows its true cost per bar, and the amounts come off your stock the moment you pour. You can add your own ingredients too, with supplier and unit cost. ### 1/5 — Settings *2026-08-18* In the settings I had it set to calculate in grams, but it would only show everything in ounces. I got frustrated that nothing I did would change it so I deleted it and canceled the free trial. **Developer response:** Thank you for reporting this, and we're sorry for the frustration. You found a genuine defect: the unit preference was saving correctly, but the calculator and recipe screens were not reading it. Nothing you tried could have resolved it. This is fixed in the next update, where grams, ounces and pounds carry through the batch size, every oil, the water and the lye. That update also adds an expanded oil catalogue including canola, an additives section for clays, sodium lactate, charcoal, micas and milks, printable recipe and batch sheets, fuller fragrance tracking with supplier and IFRA limits, costing that covers additives, fragrance, packaging and labels, custom ingredients, and recipe versioning. We'd welcome the opportunity to earn a second look. Thank you! ### 2/5 — Missing Oils? *2026-08-13* I cannot find Canola Oil in the drop down of “200 oils” in the database. Am I missing something? **Developer response:** You're not missing anything - canola isn't in the current catalogue. It's added in the next update, along with corn, cottonseed, peanut, wheat germ and about twenty more. If you need it before then, canola's saponification value is 0.133 NaOH (0.186 KOH), so you can work the lye by hand in the meantime. Sorry for the inconvenience. ### 5/5 — Simple and Accurate *2026-06-25* Great soap calculator! Easy to use, accurate lye calculations, and helpful for planning recipes with confidence. ### 5/5 — New Soap Maker *2026-05-29* This is making my new hobby so much easier to start. I’ve planned on making my family soap for years but was intimidated by. This gives me step by step directions ## Frequently asked questions about Soap Calculator ### What types of soap can Soap Calculator handle? Soap Calculator supports cold-process, hot-process, melt-and-pour, and liquid soap recipes. It can calculate lye weights for both NaOH (solid bars) and KOH (liquid soap). ### How does Soap Calculator ensure safety when dealing with lye? Lye numbers are framed as safety calculations on every screen, highlighting hazards, required protective equipment, and safe-handling sequences in dedicated safety-red callouts. ### Can I generate ingredient labels with Soap Calculator? Yes, the app generates FDA-style INCI ingredient labels, including lot numbers and manufacture dates. Labels can be exported as PDFs ready for printing on Avery 5160 sheets. ### How does the cure timer work in Soap Calculator? The cure timer is integrated with your device, appearing in the Dynamic Island and on your Lock Screen. You'll receive a notification the morning a batch is ready. ### Does Soap Calculator collect any personal data? No, Soap Calculator is designed with privacy in mind. It has no accounts, no backend, no analytics, and no tracking. All data lives on your device, and a Privacy Manifest declares zero data collection. ### What are the pricing options for Soap Calculator Pro? Soap Calculator Pro offers a monthly subscription at $1.99, a yearly subscription at $4.99, or a one-time Lifetime purchase at $9.99. All subscription plans include a 3-day free trial. ### How often is Soap Calculator updated? The app was last updated on June 23, 2026, with version 1.1. This indicates a recent update, suggesting ongoing development and support. ### What is the user sentiment for Soap Calculator? Based on the provided data, Soap Calculator has a perfect rating of 5.0 stars from 5 ratings, indicating extremely positive user sentiment. ## Version history (last 5 releases) ### 1.7 — 2026-08-24 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. ### 1.6 — 2026-08-08 Your whole studio, now on every device. • iCloud sync - your recipes, batches, and stock now travel with you across iPhone and iPad, privately through your own iCloud. No account, no sign-up. Check the status any time in Settings. • Start a batch in a tap - pour a batch straight from any saved recipe and start its cure timer, right from the recipe. • Cure-date reminders - switch on "Notify me when cured" and the app tells you the morning a batch is ready to use or sell. • Labels without the detour - generate an FDA-compliant ingredient label directly from your recipe. ### 1.5 — 2026-07-19 Smoother and more reliable throughout, with groundwork for smarter improvements based on how makers actually use the app. ### 1.4 — 2026-07-16 The biggest update yet - built with working soap makers. NEW: Photo to Recipe. Point your camera at a handwritten card, notebook page, or printed recipe. The app reads the oils, weights, and superfat, matches every ingredient to its oil database, and builds the recipe for you. Review and edit every gram before saving. Runs entirely on your device with Apple Intelligence - works offline, and your recipes never leave your phone. NEW: Fit to Mold. Enter your mold's dimensions once and any recipe resizes to fill it exactly. Save your molds for one-tap reuse. NEW: Master Batching. Pre-mix your lye solution in bulk. The calculator tells you exactly how much master batch and how much additional water today's pour needs. NEW: Batch Records. Log lye lot, oil lots, pour and ambient temperature, and gel phase per batch. Every batch freezes a snapshot of the recipe as poured, and you can print a full batch record PDF for your files. NEW: Smarter Labels. Choose true-soap or cosmetic-style ingredient listings, three list formats, and common names or INCI. ALSO IN THIS UPDATE - Scale any recipe up or down, or duplicate it to iterate safely - Fragrance calculator built into the main screen, with usage-rate warnings - Tap any oil for its SAP value, source, and fatty acid profile - Pounds support alongside grams and ounces - Restore your recipes from a backup file Made something great with this update? A rating helps other soap makers find us. ### 1.3 — 2026-06-28 Minor improvements and bug fixes. Happy soaping! ## More apps by Panda Taps LLC - [Inspire: Thrive Daily Quotes](https://appshunter.io/ios/app/inspire-thrive-daily-quotes/id6502307750) - [StarQuest: Daily Cosmos Facts](https://appshunter.io/ios/app/starquest-daily-cosmos-facts/id6745439036) - [Sterling: Dine with Confidence](https://appshunter.io/ios/app/sterling-dine-with-confidence/id6765960448) - [Conduit Fill & Bending Calc](https://appshunter.io/ios/app/conduit-fill-and-bending-calc/id6768075426) - [Haiku: Daily Poems & Poetry](https://appshunter.io/ios/app/haiku-daily-poems-and-poetry/id6774410191) All apps by Panda Taps LLC: https://appshunter.io/developer/1744998505 ## Related topics [soap calculator](https://appshunter.io/ios/topics/soap-calculator) · [lye calculator](https://appshunter.io/ios/topics/lye-calculator) · [handmade soap calculator](https://appshunter.io/ios/topics/handmade-soap-calculator) · [handmade soap calculator lite](https://appshunter.io/ios/topics/handmade-soap-calculator-lite) · [soap making calculator -soapie](https://appshunter.io/ios/topics/soap-making-calculator-soapie) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*