# Periodic vs DrPhos' Reaction Balancer

The clearest difference is price: Periodic at Free against DrPhos' Reaction Balancer's $0.99. Periodic also leads on in-app purchases (none vs 11) and iOS requirement (15.1 vs 17.0). DrPhos' Reaction Balancer's advantage is ads (none vs shown). On update cadence and device support there is nothing between them.

Periodic is free to download; DrPhos' Reaction Balancer costs $0.99 up front. DrPhos' Reaction Balancer sells 11 one-off in-app purchases. Periodic asks for nothing beyond the download.

Periodic ships an update every 5 weeks, DrPhos' Reaction Balancer every 3 weeks. The most recent releases landed on October 12, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Periodic | DrPhos' Reaction Balancer |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/drphos-reaction-balancer/id6474077005/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 35 MB | 15 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Periodic

[App page](https://appshunter.io/ios/app/periodic-table-elements/id1628647298)

**Features:** macOS Compatibility

**In-app purchases:** none


### DrPhos' Reaction Balancer

[App page](https://appshunter.io/ios/app/drphos-reaction-balancer/id6474077005)

Instantly balance chemical equations with this tool. It supports complex formulas and provides clear visual formatting, making it ideal for students learning stoichiometry and preparing for chemistry exams.

**Highlights:** Automatically balances chemical equations, Supports complex formulas with parentheses, Clear visual formatting with subscripts, Built-in learning support, Molar Mass Calculator, Stoichiometry Solver

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quadratic Equation Solver | $0.99 | one-time |
| Significant Figures Counter | $0.99 | one-time |
| Science Calculator | $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 |
| pH Calculator | $0.99 | one-time |
| Reaction Balancer | $0.99 | one-time |
| Stoichiometry | $0.99 | one-time |
| Solution Concentration | $0.99 | one-time |
| Kinetics | $0.99 | one-time |


## Frequently asked questions

### Is Periodic free?

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

### Is DrPhos' Reaction Balancer free?

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

### Do Periodic or DrPhos' Reaction Balancer have ads?

Periodic shows ads; DrPhos' Reaction Balancer does not.

### Which is updated more often, Periodic or DrPhos' Reaction Balancer?

Periodic ships an update every 5 weeks, and DrPhos' Reaction Balancer every 3 weeks. Most recently, Periodic was updated on October 12, 2026 and DrPhos' Reaction Balancer on September 30, 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.*