# Bayswater vs DrPhos' pH Calculator

The clearest difference is price: Bayswater at Free against DrPhos' pH Calculator's $0.99. Bayswater also leads on in-app purchases (none vs 10) and iOS requirement (15.0 vs 17.2). DrPhos' pH Calculator's advantage is update cadence (every 10 days vs every 3 weeks). On ads and device support there is nothing between them.

Bayswater is free to download; DrPhos' pH Calculator costs $0.99 up front. DrPhos' pH Calculator sells 10 one-off in-app purchases. Bayswater asks for nothing beyond the download.

Bayswater ships an update every 3 weeks, DrPhos' pH Calculator every 10 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Bayswater | DrPhos' pH Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 13 MB | 15 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bayswater College Limited](https://appshunter.io/developer/1479175027) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Bayswater

[App page](https://appshunter.io/ios/app/bayswater/id1479175028)

**Features:** Vision Pro support

**In-app purchases:** none


### DrPhos' pH Calculator

[App page](https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321)

This tool instantly calculates pH, pOH, and ion concentrations for strong and weak acids and bases. It supports molarity and scientific notation, ensuring accurate results for general chemistry problems.

**Highlights:** Calculate pH, pOH, [H⁺], or [OH⁻], Handles strong and weak acids/bases, Supports Ka and Kb values, Built-in molarity and scientific notation, Automatic pH + pOH = 14, Clean, focused layout

**Features:** macOS Compatibility

**In-app purchases (10)**

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


## Frequently asked questions

### Is Bayswater free?

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

### Is DrPhos' pH Calculator free?

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

### Do Bayswater or DrPhos' pH Calculator have ads?

Neither Bayswater nor DrPhos' pH Calculator shows ads.

### Which is updated more often, Bayswater or DrPhos' pH Calculator?

Bayswater ships an update every 3 weeks, and DrPhos' pH Calculator every 10 days. Most recently, Bayswater was updated on November 3, 2026 and DrPhos' pH Calculator 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.*