# Electrochemistry vs DrPhos' Stoichiometry

The clearest difference is in-app purchases: Electrochemistry at none against DrPhos' Stoichiometry's 11. DrPhos' Stoichiometry's advantage is update cadence (every 3 weeks vs every 3 months) and price ($0.99 vs $3.99). On ads, device support and iOS requirement there is nothing between them.

Electrochemistry costs $3.99 and DrPhos' Stoichiometry $0.99 up front. DrPhos' Stoichiometry sells 11 one-off in-app purchases. Electrochemistry asks for nothing beyond the download.

Electrochemistry ships an update every 3 months, DrPhos' Stoichiometry every 3 weeks. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Electrochemistry | DrPhos' Stoichiometry |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/drphos-stoichiometry/id6475633178/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 1 MB | 15 MB |
| Requires iOS | **17.0** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Electrochemistry

[App page](https://appshunter.io/ios/app/electrochemistry/id1014920086)

**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 Electrochemistry free?

Electrochemistry costs $3.99, with no in-app purchases.

### Is DrPhos' Stoichiometry free?

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

### Do Electrochemistry or DrPhos' Stoichiometry have ads?

Neither Electrochemistry nor DrPhos' Stoichiometry shows ads.

### Which is updated more often, Electrochemistry or DrPhos' Stoichiometry?

Electrochemistry ships an update every 3 months, and DrPhos' Stoichiometry every 3 weeks. Most recently, Electrochemistry was updated on October 18, 2026 and DrPhos' Stoichiometry on October 24, 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.*