# 3SAT Fleet vs Estar Digital Castro

The clearest difference is iOS requirement: 3SAT Fleet at 13.4 against Estar Digital Castro's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 3SAT Fleet | Estar Digital Castro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Size | 36 MB | 67 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [3SAT](https://appshunter.io/developer/1595497266) | [Cidatec Tecnologia e sistema LTDA](https://appshunter.io/developer/1385878822) |

## What reviewers say

### 3SAT Fleet

[App page](https://appshunter.io/ios/app/3sat-fleet/id1643945102)

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

**In-app purchases:** none


### Estar Digital Castro

[App page](https://appshunter.io/ios/app/estar-digital-castro/id6444539646)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 3SAT Fleet free?

3SAT Fleet is free to download, with no in-app purchases.

### Is Estar Digital Castro free?

Estar Digital Castro is free to download, with no in-app purchases.

### Do 3SAT Fleet or Estar Digital Castro have ads?

Neither 3SAT Fleet nor Estar Digital Castro shows ads.

### Which is updated more often, 3SAT Fleet or Estar Digital Castro?

3SAT Fleet ships an update every 6 weeks, and Estar Digital Castro every 6 weeks. Most recently, 3SAT Fleet was updated on November 7, 2026 and Estar Digital Castro on November 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.*