# Gravity! vs MemAide

The clearest difference is rating: MemAide at 5.0 against Gravity!'s 3.9. MemAide also leads on review sentiment (100% vs 74%) and monetization model (free vs free with in-app purchases). Gravity!'s advantage is ratings volume (18 vs 4). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Gravity! sells 1 one-off in-app purchase and MemAide sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

MemAide holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 18 and 4 respectively. Written reviews point the same way: 74% of Gravity!'s written reviews are positive against 100% of MemAide's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Gravity! | MemAide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (18 ratings)](https://appshunter.io/ios/app/gravity/id738871919/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/memaide/id1288409728/reviews)** |
| Number of ratings | **18** | 4 |
| Positive reviews | 73.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 111 MB |
| Requires iOS | 15.6 | **12.1** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Marc Davis](https://appshunter.io/developer/1010892850) | [shaojun lin](https://appshunter.io/developer/1263579053) |

## What reviewers say

### Gravity!

[App page](https://appshunter.io/ios/app/gravity/id738871919)

Simulate the forces of gravity by flinging particles and observing their interactions. Create celestial bodies like planets and black holes, and customize their properties. Explore vast cosmic simulations with intuitive zoom and pan controls.

**Highlights:** Gravity simulation, Particle interaction, Create solar systems, Add black holes, Adjust particle properties, Zoom and pan controls

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gravity! Extended Edition | $0.99 | one-time |


### MemAide

[App page](https://appshunter.io/ios/app/memaide/id1288409728)

This app helps you convert short-term memories into long-term knowledge through a managed daily study system. It's ideal for vocabulary building for exams or general knowledge accumulation, offering offline functionality and robust data security.

**Highlights:** Scheduled daily reviews, Text-to-speech enhancement, Input/output for data exchange, Quiz functionality, Photo and drawing integration, Offline data storage, Encrypted data protection

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GRE 5000 for MemAide Pro | $2.99 | one-time |
| MemAide Premium | $5.99 | one-time |


## Frequently asked questions

### Is Gravity! free?

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

### Is MemAide free?

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

### Which has better reviews, Gravity! or MemAide?

MemAide is rated higher. Gravity! averages 3.9 out of 5 from 18 ratings, while MemAide averages 5.0 from 4 ratings.

### Do Gravity! or MemAide have ads?

Neither Gravity! nor MemAide shows ads.

### Which is updated more often, Gravity! or MemAide?

Gravity! ships an update every 2 months, and MemAide every 2 months. Most recently, Gravity! was updated on October 7, 2026 and MemAide on October 3, 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.*