# DrPhos' Kinetics — Reaction Rate Calculator

> Reaction Rate Calculator (iPhone/iPad app by Monte L Helm.)

- Source: https://appshunter.io/ios/app/drphos-kinetics/id6504414316 (this page in markdown: same URL + `.md`)
- Developer: [Monte L Helm](https://appshunter.io/developer/1715082616)
- Category: Education, Utilities
- Price: $0.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 17.5 · 15 MB
- Languages: English
- Released: 2024-06-14
- Data updated: 2026-05-14
- User reviews in markdown: https://appshunter.io/ios/app/drphos-kinetics/id6504414316/reviews.md

## What is DrPhos' Kinetics?

olve Chemical Kinetics with Confidence

The DrPhos Kinetics Tool helps you quickly solve integrated rate law problems for zero, first, and second-order reactions. Whether you’re working on reaction rates, half-life, or concentration over time, this app delivers fast, accurate results.

Perfect for high school and college chemistry students, the tool guides you through the logic of each reaction order with a clean, focused interface.

Features:
	•	Supports zero, first, and second-order reactions
	•	Calculates rate constants, concentration, time, and half-life
	•	Clean input layout with instant feedback
	•	Great for lab prep, homework, or exam review
	•	Designed for AP Chemistry, General Chemistry, and beyond

Use this as a standalone app or unlock it as part of the full DrPhos GenChem Helper suite for a complete chemistry toolkit.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

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



## Version history (last 5 releases)

### 3.0 — 2025-07-31

What’s New
	•	Solve zero, first, and second-order rate laws
	•	Calculate rate constants, time, concentration, and half-life
	•	Clean, student-friendly input and output
	•	Fast, accurate results for chemistry practice and review

### 2.3.1 — 2024-10-17

Minor improvements and bug fixes.

### 2.3 — 2024-07-17

Bug fixes and updated graphics

### 2.2.2 — 2024-06-29

bug fixes
added kinetics calculator

### 2.0 — 2024-06-17

Added option to purchase other mini-helper chemistry apps.

## More apps by Monte L Helm

- [DrPhos' Molar Mass](https://appshunter.io/ios/app/drphos-molar-mass/id6471319631)
- [Ionic Compound Builder](https://appshunter.io/ios/app/ionic-compound-builder/id6472619902)
- [DrPhos' Ionic Compounds](https://appshunter.io/ios/app/drphos-ionic-compounds/id6473097401)
- [DrPhos' Reaction Balancer](https://appshunter.io/ios/app/drphos-reaction-balancer/id6474077005)
- [DrPhos' Stoichiometry](https://appshunter.io/ios/app/drphos-stoichiometry/id6475633178)
- [DrPhos' GenChem Naming](https://appshunter.io/ios/app/drphos-genchem-naming/id6476617346)

All apps by Monte L Helm: https://appshunter.io/developer/1715082616

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-14.*