# Define Gravity vs DropOS

The clearest difference is update cadence: Define Gravity at every 2 days against DropOS's every 6 days. Define Gravity also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Define Gravity against 5.0 for DropOS. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Define Gravity ships an update every 2 days, DropOS every 6 days. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Define Gravity | DropOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/define-gravity/id6739888193/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/dropos-marble-machine/id6788594506/reviews) |
| Number of ratings | **5** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 days |
| Monetization | Free | Free |
| Size | 154 MB | 28 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MangumLabs LLC](https://appshunter.io/developer/675487379) | [LaunchKitOS](https://appshunter.io/developer/6820402257) |

## What reviewers say

### 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


### DropOS

[App page](https://appshunter.io/ios/app/dropos-marble-machine/id6788594506)

Engage in a physics-based puzzle game where you strategically drop marbles into a contraption. Plan the sequence of drops to guide each marble into its matching bin, with each marble's passage altering the machine for the next.

**Highlights:** Physics-based contraption puzzles, Strategic marble dropping, 100 hand-designed levels, Weekly leaderboard, Earn in-game cogs, Bonus brass pin board

**In-app purchases:** none


## Frequently asked questions

### Is Define Gravity free?

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

### Is DropOS free?

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

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

Define Gravity and DropOS are both rated 5.0 out of 5 on the App Store, from 5 and 2 ratings respectively.

### Do Define Gravity or DropOS have ads?

Neither Define Gravity nor DropOS shows ads.

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

Define Gravity ships an update every 2 days, and DropOS every 6 days. Most recently, Define Gravity was updated on October 9, 2026 and DropOS on October 11, 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.*