# Stoichiometry: Lab Calc — Molar Mass & Reaction Tools

> Molar Mass & Reaction Tools (iPhone/iPad app by 玉立 蔡.)

- Source: https://appshunter.io/ios/app/stoichiometry-lab-calc/id6798973130 (this page in markdown: same URL + `.md`)
- Developer: [玉立 蔡](https://appshunter.io/developer/6798914513)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-08-19
- Data updated: 2026-10-01
- User reviews in markdown: https://appshunter.io/ios/app/stoichiometry-lab-calc/id6798973130/reviews.md

## What is Stoichiometry?

Stoichiometry: Lab Calc is a focused chemistry calculator for study, lab preparation, and everyday quantitative work. Enter a few known values to obtain clear, easy-to-review results. Core calculations work offline.

SINGLE-SUBSTANCE CALCULATIONS

• Parse chemical formulas and calculate molar mass• Convert between sample mass, substance mass, amount of substance, and purity• Calculate molarity, mass fraction, volume, and density• Supports common formula notation, including parentheses and hydrates

REACTION CALCULATIONS

• Enter and automatically balance a chemical equation• Choose a reference substance and calculate quantities from stoichiometric ratios• Work with equivalents, purity, concentration, volume, and density• Save result tables as images

CUSTOM REAGENT LIBRARY

• Store reagent names, formulas, brands, catalog numbers, images, and common properties• Search by name, formula, brand, or catalog number• Apply saved reagents directly to calculations• Back up and restore local reagent records

Reagent data stays on your device. No account is required, and experimental data is not uploaded.

The custom reagent library is available as a one-time in-app purchase that permanently unlocks the feature.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Permanent Reagent Library Unlock | $0.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-19

No release notes.

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All apps by 玉立 蔡: https://appshunter.io/developer/6798914513

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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 2026-10-01.*