# Pulmonary vs Tower Stack Challenge

The clearest difference is in-app purchases: Tower Stack Challenge at none against Pulmonary's 1. Pulmonary's advantage is ads (none vs shown) and update cadence (every 4 months vs every 17 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Pulmonary sells 1 one-off in-app purchase. Tower Stack Challenge asks for nothing beyond the download.

Pulmonary ships an update every 4 months, Tower Stack Challenge every 17 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Pulmonary | Tower Stack Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (3 ratings)](https://appshunter.io/ios/app/pulmonary/id1215076838/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 17 months |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 254 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tommy Soereide Kjaer](https://appshunter.io/developer/1215076837) | [KAKAK](https://appshunter.io/developer/1501395145) |

## What reviewers say

### Pulmonary

[App page](https://appshunter.io/ios/app/pulmonary/id1215076838)

A challenging puzzle game that requires players to use past information to navigate obscured paths. Test your logic and problem-solving skills in this unique experience.

**Highlights:** Obscured path navigation, Information-based gameplay, Logic puzzles, Problem-solving challenges, Unique game mechanics

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 11 New Stages | $0.99 | one-time |


### Tower Stack Challenge

[App page](https://appshunter.io/ios/app/tower-stack-challenge/id6737799812)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pulmonary free?

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

### Is Tower Stack Challenge free?

Tower Stack Challenge is free to download, with no in-app purchases.

### Do Pulmonary or Tower Stack Challenge have ads?

Tower Stack Challenge shows ads; Pulmonary does not.

### Which is updated more often, Pulmonary or Tower Stack Challenge?

Pulmonary ships an update every 4 months, and Tower Stack Challenge every 17 months. Most recently, Pulmonary was updated on October 24, 2026 and Tower Stack Challenge on October 27, 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.*