# iStackz vs Galileo

The clearest difference is in-app purchases: Galileo at none against iStackz's 1. iStackz's advantage is update cadence (every 4 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. iStackz sells 1 in-app purchase, starting at $1.99 per month. Galileo asks for nothing beyond the download.

iStackz ships an update every 4 weeks, Galileo every 4 months. The most recent releases landed on October 19, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | iStackz | Galileo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 4 months |
| Size | 3 MB | 65 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christoph Luedi](https://appshunter.io/developer/918595512) | [Davide Fiorino](https://appshunter.io/developer/1082765618) |

## What reviewers say

### iStackz

[App page](https://appshunter.io/ios/app/istackz/id918620482)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full functionality - monthly | $1.99 | per month |


### Galileo

[App page](https://appshunter.io/ios/app/galileo-ar-physics/id1323481784)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iStackz free?

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

### Is Galileo free?

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

### Do iStackz or Galileo have ads?

Neither iStackz nor Galileo shows ads.

### Which is updated more often, iStackz or Galileo?

iStackz ships an update every 4 weeks, and Galileo every 4 months. Most recently, iStackz was updated on October 19, 2026 and Galileo on October 29, 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.*