This app helps handmade soap makers calculate precise lye and water weights for various soap types. It provides detailed fatty-acid profiles, predicted bar properties, and generates FDA-style ingredient labels. It also includes batch tracking and a cure timer with lock screen widgets.
1.5
July 19, 2026
Smoother and more reliable throughout, with groundwork for smarter improvements based on how makers actually use the app.
The full app, billed monthly. 3-day trial.
$9.99
Trace Pro Lifetime
The full app, forever. One-time purchase.
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).
Lye numbers are framed as safety calculations on every screen, highlighting hazards, required protective equipment, and safe-handling sequences in dedicated safety-red callouts.
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.
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.
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.
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.
The app was last updated on June 23, 2026, with version 1.1. This indicates a recent update, suggesting ongoing development and support.
Based on the provided data, Soap Calculator has a perfect rating of 5.0 stars from 5 ratings, indicating extremely positive user sentiment.
