# GBA vs Protocol66

The clearest difference is in-app purchases: GBA at none against Protocol66's 3. GBA also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Protocol66 sells 3 in-app purchases, starting at $2.99 per 7 days. GBA asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | GBA | Protocol66 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Size | 87 MB | 35 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 12+ |
| Developer | [SUPERLEVEL, OOO](https://appshunter.io/developer/1558452077) | [POCKET APPS STUDIO PTE. LTD.](https://appshunter.io/developer/1864339139) |

## What reviewers say

### GBA

[App page](https://appshunter.io/ios/app/gba-tower-defense/id6451270178)

**In-app purchases:** none


### Protocol66

[App page](https://appshunter.io/ios/app/protocol66/id6757076988)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $2.99 | per 7 days |
| Pro | $19.99 | per year |
| Lifetime Access | $3.99 | one-time |


## Frequently asked questions

### Is GBA free?

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

### Is Protocol66 free?

Protocol66 is free to download, with in-app purchases available.

### Do GBA or Protocol66 have ads?

Neither GBA nor Protocol66 shows ads.

### Which is updated more often, GBA or Protocol66?

GBA ships an update every 2 weeks, and Protocol66 every 2 weeks. Most recently, GBA was updated on October 20, 2026 and Protocol66 on October 6, 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.*