# Column Construction Calculator vs DrPhos' Stoichiometry

The clearest difference is in-app purchases: Column Construction Calculator at none against DrPhos' Stoichiometry's 11. DrPhos' Stoichiometry's advantage is update cadence (every 3 weeks vs every 38 months) and price ($0.99 vs $1.99). On ads, device support and iOS requirement there is nothing between them.

Column Construction Calculator costs $1.99 and DrPhos' Stoichiometry $0.99 up front. DrPhos' Stoichiometry sells 11 one-off in-app purchases. Column Construction Calculator asks for nothing beyond the download.

Column Construction Calculator ships an update every 38 months, DrPhos' Stoichiometry every 3 weeks. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Column Construction Calculator | DrPhos' Stoichiometry |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/drphos-stoichiometry/id6475633178/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 34 MB | 15 MB |
| Requires iOS | **16.0** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Column Construction Calculator

[App page](https://appshunter.io/ios/app/column-construction-calculator/id1148046540)

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

**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 (11)**

| 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 |
| Molar Mass Calculator | $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 Column Construction Calculator free?

Column Construction Calculator costs $1.99, with no in-app purchases.

### Is DrPhos' Stoichiometry free?

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

### Do Column Construction Calculator or DrPhos' Stoichiometry have ads?

Neither Column Construction Calculator nor DrPhos' Stoichiometry shows ads.

### Which is updated more often, Column Construction Calculator or DrPhos' Stoichiometry?

Column Construction Calculator ships an update every 38 months, and DrPhos' Stoichiometry every 3 weeks. Most recently, Column Construction Calculator was updated on October 14, 2026 and DrPhos' Stoichiometry on October 7, 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.*