# Acid Base pH vs Palace Walk

The clearest difference is price: Palace Walk at Free against Acid Base pH's $3.99. Palace Walk also leads on update cadence (fortnightly vs every 3 months) and ratings volume (17 vs 1). Acid Base pH's advantage is ads (none vs shown) and rating (5.0 vs 4.6). On in-app purchases there is nothing between them.

Palace Walk is free to download; Acid Base pH costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Acid Base pH holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Palace Walk has 17 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Acid Base pH's written reviews are positive against 81% of Palace Walk's.

Acid Base pH ships an update every 3 months, Palace Walk fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Acid Base pH | Palace Walk |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/acid-base-ph/id977951851/reviews)** | [4.6 (17 ratings)](https://appshunter.io/ios/app/palace-walk/id1583677186/reviews) |
| Number of ratings | 1 | **17** |
| Positive reviews | **100.0% of reviews** | 81.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Paid | **Ad-supported** |
| Size | 2 MB | 59 MB |
| Requires iOS | 17.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Tomoya Furubori](https://appshunter.io/developer/1560096349) |

## 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


### Palace Walk

[App page](https://appshunter.io/ios/app/palace-walk/id1583677186)

Train your memory using the Memory Palace technique. This app provides an easy way to practice the Method of Loci, useful for studying, memorizing lists, and improving recall.

**Highlights:** Memory Palace training, Method of Loci practice, Journey Method exercises, Useful for studying, Helps memorize lists

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Acid Base pH free?

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

### Is Palace Walk free?

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

### Which has better reviews, Acid Base pH or Palace Walk?

Acid Base pH is rated higher. Acid Base pH averages 5.0 out of 5 from 1 ratings, while Palace Walk averages 4.6 from 17 ratings.

### Do Acid Base pH or Palace Walk have ads?

Palace Walk shows ads; Acid Base pH does not.

### Which is updated more often, Acid Base pH or Palace Walk?

Acid Base pH ships an update every 3 months, and Palace Walk fortnightly. Most recently, Acid Base pH was updated on October 24, 2026 and Palace Walk 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.*