# The Public Variable vs MnemoStack

The clearest difference is in-app purchases: The Public Variable at none against MnemoStack's 3. The Public Variable also leads on device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price, update cadence and ads there is nothing between them.

Both are free to download. MnemoStack sells 3 in-app purchases, starting at $3.99 per month. The Public Variable asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 12, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | The Public Variable | MnemoStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/the-public-variable/id6741500963/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | — |
| Size | 1.4 GB | 84 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [John Sullivan](https://appshunter.io/developer/1630479388) | [Vincent Launay](https://appshunter.io/developer/1198218316) |

## What reviewers say

### The Public Variable

[App page](https://appshunter.io/ios/app/the-public-variable/id6741500963)

Experience a unique augmented reality theatre piece exploring perspective and communication. This evolving digital space will eventually host the full production, offering an immersive artistic experience accessible from anywhere.

**Highlights:** Augmented reality theatre, Perspective exploration, Immersive digital space, Evolving content, Accessible anywhere

**In-app purchases:** none


### MnemoStack

[App page](https://appshunter.io/ios/app/mnemostack/id6755091634)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Xtremagic Pass | $3.99 | per month |
| Xtremagic Pass | $22.99 | per year |
| Full Access (One-Time Purchase) | $7.99 | one-time |


## Frequently asked questions

### Is The Public Variable free?

The Public Variable is free to download, with no in-app purchases.

### Is MnemoStack free?

MnemoStack is free to download, with in-app purchases available.

### Do The Public Variable or MnemoStack have ads?

Neither The Public Variable nor MnemoStack shows ads.

### Which is updated more often, The Public Variable or MnemoStack?

The Public Variable ships an update every 2 weeks, and MnemoStack every 2 weeks. Most recently, The Public Variable was updated on October 12, 2026 and MnemoStack on September 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.*