# Soap Recipe Calculator: Lye — Lye Calculator for NaOH & KOH

> Handmade soap recipe formulation, cost calculation, and property evaluation tool. (iPhone/iPad app by 瑜 张.)

- Source: https://appshunter.io/ios/app/soap-recipe-calculator-lye/id6742807563 (this page in markdown: same URL + `.md`)
- Developer: [瑜 张](https://appshunter.io/developer/1799973240)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases (on sale, was $2.99)
- Rating: 4.50/5 from 2 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 4 MB
- Languages: Chinese (Simplified, China), Chinese (Traditional, Taiwan), American English
- Released: 2025-03-05
- Data updated: 2026-09-19
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/soap-recipe-calculator-lye/id6742807563/reviews.md

## What is Soap Recipe Calculator?

Design perfect soap recipes in seconds.

Soap Calculator is a professional, offline lye calculator designed for handmade soap makers and hobbyists who want precise measurements without complicated setups.

Choose your base oils, set your batch size, and instantly get the exact NaOH or KOH required. As you tweak your ingredients, watch your soap's hardness, cleansing, lather, INS scoring, and total cost update in real-time.

Core Tools & Features: Real-time evaluation, multi-dimensional scoring, 100% offline usage with local storage, flexible units, recipe saving & sharing, classic templates, and a built-in database of over 170 oils.

Basic features are free forever, with a one-time Pro unlock (no ads or subscriptions).

## Key features

- Real-time recipe evaluation
- Smart recipe scoring & INS suggestions
- Solid & liquid soap support
- 1-click cost calculation
- Rich oil database
- Recipe library & templates
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Soap Calculator Pro | $3.99 | one-time |


## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/soap-recipe-calculator-lye/id6742807563/reviews.md

### 5/5 — 作者很用心，最近的更新都很棒

*2026-05-24*

作者最近的几次更新都很具备实用性，直击用户痛点需求。

**Developer response:** 谢谢您的好评！能切实帮到用户是我们更新的初衷，我们会继续用心优化产品。

### 5/5 — 超级赞的团队！

*2025-10-02*

除了功能方便好用之外，团队的响应速度真的超级赞. 做皂的时候经常用到澳洲胡桃油，app里面没有，于是联系了开发团队请求添加，结果邮件发了不到半小时就得到反馈了….鉴于一个长期跟印度三哥扯皮的人来说，体验感极度拉满😂😂

**Developer response:** 谢谢支持哦！

### 5/5 — 很方便

*2025-07-31*

支持重量和百分比切换 有时候想改油量 改个数字就行 很灵活

### 5/5 — 很好用哦

*2025-07-30*

界面干干净净没广告，这点比其他工具强太多，用着心情都好。

### 5/5 — 刚开始做手工皂总算错碱量，用这个app后就没失败过，新手福音！

*2025-07-29*

刚开始做手工皂总算错碱量，用这个app后就没失败过，新手福音！

### 5/5 — 尝试了一下，感觉蛮好的

*2025-07-28*

试着做了教程里的马赛皂，成品硬度刚好，泡沫也细腻，太惊喜了。

## Frequently asked questions about Soap Recipe Calculator

### What is Soap Calculator used for?

Soap Calculator is used to formulate handmade soap recipes, calculate ingredient costs, and evaluate soap properties like hardness, cleansing, and INS values. It helps both hobbyists and small businesses create consistent and well-balanced soap recipes.

### Does Soap Calculator have ads?

No, Soap Calculator does not contain advertisements. It is a one-time purchase app with no subscriptions or ads, ensuring an uninterrupted user experience.

### What is the price of Soap Calculator?

Soap Calculator is available for a one-time purchase of $2.99. This grants you permanent access to all its features without any recurring fees.

### Can Soap Calculator be used offline?

Yes, Soap Calculator is 100% offline and privacy-first. All your data is stored locally, making it ideal for use in areas with poor or no internet connection, such as workshops or kitchens.

### What devices does Soap Calculator support?

Soap Calculator supports both iPhone and iPad devices. The app is optimized for both, with a split-screen design available on the iPad for enhanced usability.

### How often is Soap Calculator updated?

The latest version of Soap Calculator is 3.0, which was last updated on April 29, 2026. This indicates a commitment to ongoing development and improvements.

### What kind of soap recipes can I create with Soap Calculator?

Soap Calculator fully supports both solid (NaOH) and liquid (KOH) soap calculations. You can customize lye purity and utilize the rich oil database with over 170 oils to create a wide variety of soap types.

### Does Soap Calculator offer any guides for beginners?

Yes, Soap Calculator includes built-in minimalist guides covering essential soap making steps, such as safety precautions, optimal temperatures, and unmolding times. These guides are designed to help beginners achieve successful soap making.

## Version history (last 5 releases)

### 3.5 — 2026-09-09

1. Added citric acid lye compensation: when your formula includes citric acid, the extra lye is calculated automatically for your lye type (NaOH 0.624 / KOH 0.876) and shown clearly on the results page
2. Added cure-date reminders: set a cure date on a saved recipe and receive a local notification when your soap is ready to cut

### 3.4 — 2026-09-03

1. New Cost Optimization in Smart Optimize: using your entered ingredient prices, it automatically adjusts oil ratios to cut costs without lowering your recipe score — with Gentle, Balanced, and Aggressive intensity levels
2. Input & language polish: added a "Done" button to many input fields and fixed remaining text that still showed in Chinese in the English interface

### 3.3 — 2026-08-31

1. New Smart Optimize: one-tap adjustment of oil ratios to improve your recipe score and characteristics
2. New water references: water as % of oils on the results page and lye concentration in settings — see water amount in multiple ways
3. New rancidity (DOS) risk assessment to help prevent soap spoilage

### 3.2 — 2026-08-30

1. Faster app launch
2. Various internal fixes for better stability

### 3.1 — 2026-08-24

[Major Update] Soap Calculator is now free!

1. Basic recipe calculation is free forever
2. New Pro is available as a one-time purchase to unlock all advanced features
3. Previous purchasers are automatically upgraded to Pro with lifetime access

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All apps by 瑜 张: https://appshunter.io/developer/1799973240

## Related topics

[soap calculator](https://appshunter.io/ios/topics/soap-calculator) · [soap making calculator](https://appshunter.io/ios/topics/soap-making-calculator) · [soap making calculator -soapie](https://appshunter.io/ios/topics/soap-making-calculator-soapie) · [soap lye calculator](https://appshunter.io/ios/topics/soap-lye-calculator)

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*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 2026-09-19.*