# Stoichiometry vs Model ChemLab for iPad

The clearest difference is price: Stoichiometry at $2.99 against Model ChemLab for iPad's $33.99. Model ChemLab for iPad's advantage is update cadence (weekly vs every 2 months) and iOS requirement (14.0 vs 17.1). On ads, in-app purchases and device support there is nothing between them.

Stoichiometry costs $2.99 and Model ChemLab for iPad $33.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stoichiometry ships an update every 2 months, Model ChemLab for iPad weekly. The most recent releases landed on September 7, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Stoichiometry | Model ChemLab for iPad |
| --- | --- | --- |
| Price | **$2.99** | $33.99 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | — |
| Size | 1 MB | 19 MB |
| Requires iOS | 17.1 | **14.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Model Science Software Inc.](https://appshunter.io/developer/1505551537) |

## What reviewers say

### Stoichiometry

[App page](https://appshunter.io/ios/app/stoichiometry/id1330949637)

This tool helps balance chemical reactions and calculate molar masses, moles, and actual masses of reactants and products. It supports various formula formats and can identify limiting reagents. Data can be sent to another app for gas phase calculations.

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

**Features:** Vision Pro support

**In-app purchases:** none


### Model ChemLab for iPad

[App page](https://appshunter.io/ios/app/model-chemlab-for-ipad/id1556078955)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stoichiometry free?

Stoichiometry costs $2.99, with no in-app purchases.

### Is Model ChemLab for iPad free?

Model ChemLab for iPad costs $33.99, with no in-app purchases.

### Do Stoichiometry or Model ChemLab for iPad have ads?

Neither Stoichiometry nor Model ChemLab for iPad shows ads.

### Which is updated more often, Stoichiometry or Model ChemLab for iPad?

Stoichiometry ships an update every 2 months, and Model ChemLab for iPad weekly. Most recently, Stoichiometry was updated on September 7, 2026 and Model ChemLab for iPad on September 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*