# Serious Solids vs Stoichiometry Pro

The clearest difference is price: Serious Solids at Free against Stoichiometry Pro's $3.99. Serious Solids also leads on iOS requirement (12.0 vs 17.0). Stoichiometry Pro's advantage is update cadence (every 4 months vs every 48 months). On ads, in-app purchases and device support there is nothing between them.

Serious Solids is free to download; Stoichiometry Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Serious Solids ships an update every 48 months, Stoichiometry Pro every 4 months. The most recent releases landed on June 3, 2026 and August 20, 2026 respectively.

## The numbers

| Metric | Serious Solids | Stoichiometry Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[2.7 (7 ratings)](https://appshunter.io/ios/app/serious-solids/id992220810/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 52 MB | 2 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cheryl Montgomery](https://appshunter.io/developer/611176285) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### Serious Solids

[App page](https://appshunter.io/ios/app/serious-solids/id992220810)

This educational game challenges players to identify the correct combinations of cations and anions to form solid precipitates. It's designed to help users learn to predict the products of common precipitation reactions through interactive experimentation.

**Highlights:** Predict precipitation reactions, Combine cations and anions, Form solid precipitates, Experiment with ion symbols, Earn points by swiping spectator ions

**Features:** macOS Compatibility

**In-app purchases:** none


### Stoichiometry Pro

[App page](https://appshunter.io/ios/app/stoichiometry-pro/id1546919546)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Serious Solids free?

Serious Solids is free to download, with no in-app purchases.

### Is Stoichiometry Pro free?

Stoichiometry Pro costs $3.99, with no in-app purchases.

### Do Serious Solids or Stoichiometry Pro have ads?

Neither Serious Solids nor Stoichiometry Pro shows ads.

### Which is updated more often, Serious Solids or Stoichiometry Pro?

Serious Solids ships an update every 48 months, and Stoichiometry Pro every 4 months. Most recently, Serious Solids was updated on June 3, 2026 and Stoichiometry Pro on August 20, 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.*