# Illini Central CUSD 189 vs DrPhos' Stoichiometry

The clearest difference is price: Illini Central CUSD 189 at Free against DrPhos' Stoichiometry's $0.99. Illini Central CUSD 189 also leads on in-app purchases (none vs 10) and ratings volume (6 vs 2). DrPhos' Stoichiometry's advantage is rating (5.0 vs 3.7) and update cadence (every 3 weeks vs every 3 months). On ads, device support and iOS requirement there is nothing between them.

Illini Central CUSD 189 is free to download; DrPhos' Stoichiometry costs $0.99 up front. DrPhos' Stoichiometry sells 10 one-off in-app purchases. Illini Central CUSD 189 asks for nothing beyond the download.

DrPhos' Stoichiometry holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

Illini Central CUSD 189 ships an update every 3 months, DrPhos' Stoichiometry every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Illini Central CUSD 189 | DrPhos' Stoichiometry |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [3.7 (6 ratings)](https://appshunter.io/ios/app/illini-central-cusd-189/id1459687275/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/drphos-stoichiometry/id6475633178/reviews)** |
| Number of ratings | **6** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 145 MB | 15 MB |
| Requires iOS | **16.0** | 17.2 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Illini Central CUSD189](https://appshunter.io/developer/1459687274) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Illini Central CUSD 189

[App page](https://appshunter.io/ios/app/illini-central-cusd-189/id1459687275)

Stay informed about school events, district updates, and cafeteria menus. Customize notifications for your student's organizations and easily access staff contact information. Never miss important announcements or deadlines with this comprehensive communication tool.

**Highlights:** Event calendar with sharing, Customizable notifications, Weekly cafeteria menus, District live feed updates, Staff and department directory

**In-app purchases:** none


### DrPhos' Stoichiometry

[App page](https://appshunter.io/ios/app/drphos-stoichiometry/id6475633178)

This tool simplifies solving chemical reaction problems by allowing users to input balanced equations and identify known and unknown compounds. It instantly calculates moles and mass, assisting students with various stoichiometry challenges.

**Highlights:** Mole, mass, and volume conversions, Balanced chemical equation support, Compound selection, Limiting reactant detection, High school and college chemistry focus

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Significant Figures Counter | $0.99 | one-time |
| Science Calculator | $0.99 | one-time |
| Quadratic Equation Solver | $0.99 | one-time |
| Kinetics | $0.99 | one-time |
| General Chemistry Naming | $0.99 | one-time |
| Ionic Compound Builder | $0.99 | one-time |
| Solution Concentrations | $0.99 | one-time |
| Reaction Balancer | $0.99 | one-time |
| pH Calculator | $0.99 | one-time |
| Stoichiometry | $0.99 | one-time |


## Frequently asked questions

### Is Illini Central CUSD 189 free?

Illini Central CUSD 189 is free to download, with no in-app purchases.

### Is DrPhos' Stoichiometry free?

DrPhos' Stoichiometry costs $0.99, and also offers in-app purchases.

### Which has better reviews, Illini Central CUSD 189 or DrPhos' Stoichiometry?

DrPhos' Stoichiometry is rated higher. Illini Central CUSD 189 averages 3.7 out of 5 from 6 ratings, while DrPhos' Stoichiometry averages 5.0 from 2 ratings.

### Do Illini Central CUSD 189 or DrPhos' Stoichiometry have ads?

Neither Illini Central CUSD 189 nor DrPhos' Stoichiometry shows ads.

### Which is updated more often, Illini Central CUSD 189 or DrPhos' Stoichiometry?

Illini Central CUSD 189 ships an update every 3 months, and DrPhos' Stoichiometry every 3 weeks. Most recently, Illini Central CUSD 189 was updated on November 3, 2026 and DrPhos' Stoichiometry on November 4, 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.*