# Acid Base pH vs DrPhos' pH Calculator

The clearest difference is rating: Acid Base pH at 5.0 against DrPhos' pH Calculator's 3.7. Acid Base pH also leads on in-app purchases (none vs 11). DrPhos' pH Calculator's advantage is update cadence (every 10 days vs every 3 months) and price ($0.99 vs $3.99). On ads, device support and iOS requirement there is nothing between them.

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

Acid Base pH holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Acid Base pH ships an update every 3 months, DrPhos' pH Calculator every 10 days. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Acid Base pH | DrPhos' pH Calculator |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/acid-base-ph/id977951851/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 15 MB |
| Requires iOS | **17.1** | 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

### Acid Base pH

[App page](https://appshunter.io/ios/app/acid-base-ph/id977951851)

Accurately estimate pH values for acid-base aqueous systems. Calculate pH for weak and strong acids/bases, plot titration curves, and find equivalent points. Export data and find titrant volumes for desired pH.

**Highlights:** Estimate pH of acid-base solutions, Plot titration curves, Find pH and titrant volume at equivalent points, Export titration plots as image or data, Calculate titrant volume for desired pH, Includes list of common indicators

**Features:** macOS Compatibility, 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 (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Science Calculator | $0.99 | one-time |
| Quadratic Equation Solver | $0.99 | one-time |
| Significant Figures Calculator | $0.99 | one-time |
| Molar Mass 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 Acid Base pH free?

Acid Base pH costs $3.99, with no in-app purchases.

### Is DrPhos' pH Calculator free?

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

### Which has better reviews, Acid Base pH or DrPhos' pH Calculator?

Acid Base pH is rated higher. Acid Base pH averages 5.0 out of 5 from 1 ratings, while DrPhos' pH Calculator averages 3.7 from 3 ratings.

### Do Acid Base pH or DrPhos' pH Calculator have ads?

Neither Acid Base pH nor DrPhos' pH Calculator shows ads.

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

Acid Base pH ships an update every 3 months, and DrPhos' pH Calculator every 10 days. Most recently, Acid Base pH was updated on October 2, 2026 and DrPhos' pH Calculator on October 6, 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.*