# Stoichiometry

> Balances chemical reactions and calculates masses and moles of reactants/products. (iPhone/iPad app by Roman Volinsky.)

- Source: https://appshunter.io/ios/app/stoichiometry/id1330949637 (this page in markdown: same URL + `.md`)
- Developer: [Roman Volinsky](https://appshunter.io/developer/977951850)
- Category: Education, Utilities
- Price: $2.99 (on sale, was $3.99)
- Age rating: 4+
- Requires: iOS 17.1 · 1 MB
- Languages: English
- Released: 2018-01-03
- Data updated: 2026-07-18
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/stoichiometry/id1330949637/reviews.md

## What is Stoichiometry?

Stoichiometry is an ultimate tool for balancing chemical reactions, finding molar masses, moles and actual masses of reactants and products based on their chemical formulas, stoichiometric coefficients and any quantitative data provided, that available on Apple Store for iOS and Mac . 

It is enough to provide initial or final (after reaction accomplishment) mass or moles of one of the reaction component, to calculate all required and obtained masses and moles of all components. 

If data is available for several components, then limiting reagent will be found based on reaction stoichiometry. 

Molecular formula format: charge or unpaired electrons (in free radicals), if exist, must be provided as well, separated by coma: Na,+ ; R,: ; SO4,2- . Application supports state indexes: (g), (s), (l), (aq) – all are lowercase only, placed at the end of compound formula. 

App can send the data to  Gas Phase Stoichiometry app to further calculate pressures and volumes of gaseous compounds.

Either moles or masses can be filled in, but if by mistake both are provided and they don’t match, then the moles value will have a preference.

Component will be taken into consideration once the stoichiometric coefficient is provided for it.

For balancing redox reactions please refer to Electrochemistry application.

Further information and examples are provided at http://www.volard.wordpress.com.

## Key features

- Balance chemical reactions
- Calculate molar masses
- Determine moles and actual masses
- Identify limiting reagents
- Supports various formula formats
- Integrates with Gas Phase Stoichiometry app

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/stoichiometry/id1330949637/reviews.md

### 1/5 — I didn’t mean to purchase this and they refuse to refund

*2024-10-07*

Purchased this completely by accident and immediately went to Apple support after the charge finalized to request a refund. Had I seen the bundles, I would’ve considered purchasing that instead, but now that I can’t get my money back for this app, I will never purchase from this creator again.

**Developer response:** If you purchase bundle, then app price will be reimbursed, so no harm was done. Please consider removing the negative review, since it has nothing to do with creator. It's not my policy, I don't care if you get refund.
Best regards,
Roman

### 5/5 — Very cool!

*2018-05-29*

Takes into account everything!

## Frequently asked questions about Stoichiometry

### What is Stoichiometry?

Stoichiometry is a paid application designed to assist with balancing chemical reactions and performing various stoichiometric calculations, such as finding molar masses and quantities of reactants and products.

### What devices does Stoichiometry support?

Stoichiometry is available for iOS devices, specifically iPhones and iPads.

### How much does Stoichiometry cost?

Stoichiometry is a paid app, priced at $2.99 on the Apple Store.

### What is the age rating for Stoichiometry?

Stoichiometry has an age rating of 4+, making it suitable for a wide range of users.

### How often is Stoichiometry updated?

The latest version of Stoichiometry, 5.3, was released on October 11, 2024, indicating regular updates for the application.

### Does Stoichiometry have ads?

No, Stoichiometry does not contain advertisements. It is a paid application that offers an ad-free experience.

### Can Stoichiometry help with limiting reagents?

Yes, if data is available for multiple components, Stoichiometry can identify the limiting reagent based on the reaction stoichiometry.

### Does Stoichiometry offer a free trial?

As a paid application, Stoichiometry does not typically offer a free trial. Users can purchase it for $2.99 to access all its features.

## Version history (last 5 releases)

### 5.3 — 2024-10-11

Compatibility update.

### 5.2 — 2024-09-07

Compatibility update.

### 5.1 — 2023-08-16

Compatibility update.

### 5.0 — 2022-09-02

Compatibility update.

### 4.9 — 2022-07-18

Compatibility update.

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## More apps by Roman Volinsky

- [Acid Base pH](https://appshunter.io/ios/app/acid-base-ph/id977951851)
- [Chemical Equilibrium](https://appshunter.io/ios/app/chemical-equilibrium/id980553577)
- [Solubility Products](https://appshunter.io/ios/app/solubility-products/id981052864)
- [Chemical Kinetics](https://appshunter.io/ios/app/chemical-kinetics/id982593180)
- [Chemical Solution Wizard](https://appshunter.io/ios/app/chemical-solution-wizard/id987393752)
- [Liposome Calculator](https://appshunter.io/ios/app/liposome-calculator/id988429323)

All apps by Roman Volinsky: https://appshunter.io/developer/977951850

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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 2026-07-18.*