The Art & Science of
Perfect Soap
Precision lye calculations, intelligent oil blending, and guided workflows for Cold Process,
Hot Process, and Liquid Soap. Everything you need, from first batch to thousandth.
Everything for Every Soap Maker
From your first batch to your thousandth, Soaper provides the precision and guidance you need.
Precise Lye Calculations
Automatic NaOH and KOH calculations with support for dual-lye formulations. Three water calculation methods: percentage of oils, lye concentration, or water-to-lye ratio.
- NaOH for bar soap, KOH for liquid soap
- Dual-lye blends with any ratio
- Superfat adjustments from 0-20%
- Percentage or weight-based entry
- Live quality predictions as you adjust
Comprehensive Ingredient Library
Access detailed data for 84 oils with complete fatty acid profiles and saponification values, plus 117 additives, 33 fragrances, 31 colorants, and 44 trusted suppliers.
- 8 fatty acids tracked per oil
- NaOH and KOH sap values
- Usage guidelines for additives
- Scent profiles for fragrances
Professional PDF Export
Generate beautiful, professional documents for your workshop, records, or customers. Choose from 9 different export formats.
- Workshop Checklist for batch day
- Recipe Specification for records
- Customer Marketing sheets
- Display Cards, Price Tags, Product Info Cards & more
Blend Lab
Your intelligent oil blending workspace. 12 real-time quality metrics, smart optimization, and quality-based oil discovery help you craft the perfect formula.
Oil Balance Score
Saturated to unsaturated fat ratio
Bar Longevity
How long bars last in the shower
Cure Time Estimate
Predicted cure duration by oil profile
Foam Speed
How quickly lather develops
Skin Gentleness
Moisturizing and skin-friendly
Fluffy Lather
Large, airy bubble quality
Creamy Lather Quality
Dense, stable foam quality
Set Speed
Bar firmness at unmolding
Lather Stability Boost
Lather bubble longevity
Shelf Life Risk
Dreaded orange spots risk
Unsaturation Index
Iodine value at a glance
INS
Classic hardness benchmark
Optimize For
Choose what matters most - Balanced, Oil Balance Score, Bar Longevity, Gentleness, Large Bubbles, Creamy Lather, or Set Speed. The algorithm adjusts your blend to hit your target.
Quality Filter Pills
Filter and sort available oils by the qualities you want. Multi-select targets and toggle direction to find oils that boost or temper specific qualities.
Intelligent Optimization
Gradient descent algorithm with three intensity levels - Gentle, Moderate, or Aggressive. Baseline-reset system ensures predictable, undoable results every time.
Real-Time Feedback
Contextual blend feedback shows what your recipe needs. See predicted quality changes before adding each oil, with fit scores ranking the best options.
Blend History
Save your experimental blends and revisit them later. Convert any blend directly into a full recipe with one tap when you're ready to commit.
Smart Feedback Toasts
After each optimization, get clear explanations of what changed and why. If optimization was limited, see exactly which constraints were hit.
Multi-Process Soap Making
Soaper supports three process types end-to-end, each with its own tailored batch flow, calculations, and guidance.
Cold Process
The classic bar-soap craft. Saponify oils with sodium hydroxide and cure for a long-lasting bar.
Hot Process
Cook the saponification in real time. Use the bar within days instead of weeks, with rustic texture.
Liquid Soap
Potassium hydroxide formulations with paste-weight calculations, built for shampoo, body wash, and hand soap.
Batch Tracking That Grows With You
Two distinct experiences designed for different skill levels and needs.
Beginner Mode
Guided phase by phase, with educational content (cold process shown)
- 1 Preparation
- 2 Lye Solution
- 3 Melt Oils
- 4 Check Temperatures
- 5 Mixing
- 6 Molding
- 7 Curing
- Educational content at each step
- Safety reminders and lye handling guidance
- Built-in timers with push notifications
- Ingredient and requirements checklists
- Photo prompts to document your batch
Advanced Mode
3-stage streamlined workflow
- 1 Prep, Mixing & Cooling
- 2 Molding & Cooling
- 3 Curing & Cutting
- Every beginner step, condensed into 3 stages
- Multiple simultaneous timers
- Jump between stages freely
- Photo documentation at each stage
Photos & Documents on Every Recipe
Attach photos and files to recipes, oils, fragrances, colorants, additives, and suppliers — straight from your camera, photo library, or the Files app.
Document the Bar
Capture every batch — the swirl, the unmold, the cured bar — and tie it to the recipe that made it.
Keep SDS & Invoices
File safety data sheets next to your oils, supplier invoices next to your suppliers, and find them when audit time comes.
Synced & Searchable
Attachments ride along with your sync, so the picture you took on your phone is right there on your tablet too.
Smart Add-Ins & Cost Insights
Soaper sees your whole recipe — oils, lye, every additive, colorant, and fragrance — and scales the amounts to your batch.
Auto Additives, Colorants & Fragrances
Honey, clay, essential oils, micas — Soaper calculates how much you need for the batch in front of you. Tap any ingredient to see where the amount came from.
Per-Row Units
Pick the unit you actually measure in — grams, ounces, or milliliters — on every row, and see the equivalent in the opposite unit right beside it.
Skin-Safe Fragrance Guardrails
A gentle warning when a fragrance blend pushes past skin-safe levels — and process-aware recommendations that know Cold Process from Hot Process from Liquid Soap.
Recipe Cost & Cost-per-Bar
Premium tier. Estimated batch cost and cost-per-bar reflect every line in the recipe — oils, lye, water alternative, and every add-in — for a true picture of what each bar takes.
Smart Inventory Management
Track every oil, butter, fragrance, and additive. Know what you have, what you need, and what it costs.
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Stock Tracking Monitor quantities with low-stock warnings
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Recipe Intelligence See which recipes you can make, which need one ingredient, and what to buy next
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Shopping Integration Build shopping lists from recipes, track costs at purchase, and auto-restock inventory
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Supplier Directory Browse 44 pre-loaded suppliers with websites and contact info
More in Soaper
Tools added this year, from molds to home-screen widgets.
Molds
Pick a mold from the library or save your own, and Soaper sizes the recipe to fill it. Pouring into several? See how far the batter reaches.
Quick Batch
For the soaps you make on repeat: record a batch and deduct your inventory in one tap, at the recipe’s size or one you pick for just this batch.
Batch History
Each batch you make keeps the exact formulation you used, with its photos, video, quality scores, and notes — even after you change the recipe.
Purchases & Stock Value
Each purchase keeps its own price, currency, and date. See what your stock is worth, use the oldest first, and let reorder levels fill your shopping list.
Make the Library Yours
Edit Soaper’s built-in oils, fragrances, colorants, and additives, and every calculation, PDF, and Blend Lab result uses your values.
Widgets, Siri & Apple Watch
Home-screen widgets show your active batch. Ask Siri to create a recipe or start a batch, and batch timers stay in step on your Apple Watch.
Cloud Sync
Your recipes, inventory, and batch history are backed up automatically — through iCloud on Apple devices, and Google Firebase on Android with Premium. Works offline too — changes sync when you reconnect.
What’s New in Soaper
Soaper grows with the soap-making community. Here’s what landed in the last few releases.
October 2026
One batch, several molds
Add every mold you’re pouring into, see how far the batter reaches, and size the recipe to fill them. Buying six bottles? Enter the count and one price, and “Bought before” remembers your container sizes. Price a recipe’s missing items from one sheet. Quick Batch has a Batch Size control. Siri can create a recipe or start a batch, and iPad shows the recipe list and the recipe side by side.
September 2026
Resize a batch without leaving the recipe
Change a batch size right on the recipe screen and everything rescales — oils, lye, water and additives. Batch history is rebuilt, and every batch has its own page with the exact formulation you used. Set a reorder level on any inventory item and Soaper adds it to your shopping list when you run low (Premium). Now in 35 languages, with French (Canada) throughout.
May 2026
Photos, smart add-ins, and full-recipe cost
Attach photos and documents to recipes, oils, fragrances, colorants, additives, and suppliers. Auto Additives, Colorants, and Fragrances scale honey, clay, and essential oils to your batch weight. Skin-safe fragrance guardrails. Per-row units (g, oz, ml) with side-by-side conversions. Premium adds Estimated Cost per recipe — covering oils, lye, and every add-in.
Ready to Create Your
Perfect Soap?
Join soap makers who trust Soaper for precision, guidance, and beautiful results.
