# Pulmonary vs Define Gravity

The clearest difference is review sentiment: Define Gravity at 100% against Pulmonary's 50%. Define Gravity also leads on rating (5.0 vs 2.3) and in-app purchases (none vs 1). On price, ratings volume, ads and device support there is nothing between them.

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

Define Gravity holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 5 respectively. Written reviews point the same way: 50% of Pulmonary's written reviews are positive against 100% of Define Gravity's.

Pulmonary ships an update every 4 months, Define Gravity every 2 days. The most recent releases landed on September 9, 2026 and June 7, 2026 respectively.

## The numbers

| Metric | Pulmonary | Define Gravity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/pulmonary/id1215076838/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/define-gravity/id6739888193/reviews)** |
| Number of ratings | 3 | **5** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 52 MB | 154 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tommy Soereide Kjaer](https://appshunter.io/developer/1215076837) | [MangumLabs LLC](https://appshunter.io/developer/675487379) |

## 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 |


### Define Gravity

[App page](https://appshunter.io/ios/app/define-gravity/id6739888193)

Navigate challenging 2D puzzles by manipulating gravity and using a magnetic force. This game offers a unique twist on puzzle-solving with its core mechanics.

**Highlights:** Gravity manipulation, Magnetic force mechanics, 2D puzzle gameplay, Challenging levels

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pulmonary free?

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

### Is Define Gravity free?

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

### Which has better reviews, Pulmonary or Define Gravity?

Define Gravity is rated higher. Pulmonary averages 2.3 out of 5 from 3 ratings, while Define Gravity averages 5.0 from 5 ratings.

### Do Pulmonary or Define Gravity have ads?

Neither Pulmonary nor Define Gravity shows ads.

### Which is updated more often, Pulmonary or Define Gravity?

Pulmonary ships an update every 4 months, and Define Gravity every 2 days. Most recently, Pulmonary was updated on September 9, 2026 and Define Gravity on June 7, 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.*