# 421Grid vs GORILLA DRUM

The clearest difference is price: GORILLA DRUM at Free against 421Grid's $1.99. GORILLA DRUM also leads on update cadence (every 3 days vs every 3 months) and iOS requirement (15.0 vs 18.0). 421Grid's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.

GORILLA DRUM is free to download; 421Grid costs $1.99 up front. GORILLA DRUM sells 3 in-app purchases, starting at $0.99 per month. 421Grid asks for nothing beyond the download.

421Grid ships an update every 3 months, GORILLA DRUM every 3 days. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | 421Grid | GORILLA DRUM |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 4 MB | 88 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [N. Wheeler](https://appshunter.io/developer/312350021) | [Bouzer LLC](https://appshunter.io/developer/1809286489) |

## What reviewers say

### 421Grid

[App page](https://appshunter.io/ios/app/421grid/id1598461370)

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

**In-app purchases:** none


### GORILLA DRUM

[App page](https://appshunter.io/ios/app/gorilla-drum-drum-practice/id6794569041)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GORILLAS Monthly Membership Plan | $0.99 | per month |
| GORILLAS Yearly Membership Plan | $9.99 | per year |
| Remove Ads & Unlock Limits | $9.99 | one-time |


## Frequently asked questions

### Is 421Grid free?

421Grid costs $1.99, with no in-app purchases.

### Is GORILLA DRUM free?

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

### Do 421Grid or GORILLA DRUM have ads?

Neither 421Grid nor GORILLA DRUM shows ads.

### Which is updated more often, 421Grid or GORILLA DRUM?

421Grid ships an update every 3 months, and GORILLA DRUM every 3 days. Most recently, 421Grid was updated on November 11, 2026 and GORILLA DRUM on November 10, 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.*