# ESA Instruments vs CrewView

The clearest difference is iOS requirement: CrewView at 12.0 against ESA Instruments'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.

ESA Instruments ships an update every 6 months, CrewView every 4 months. Both last shipped on September 30, 2026.

## The numbers

| Metric | ESA Instruments | CrewView |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 3 MB | 26 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astra Yacht](https://appshunter.io/developer/516503620) | [Sailmon BV](https://appshunter.io/developer/1082768941) |

## What reviewers say

### ESA Instruments

[App page](https://appshunter.io/ios/app/esa-instruments/id959518561)

**Features:** macOS Compatibility

**In-app purchases:** none


### CrewView

[App page](https://appshunter.io/ios/app/crewview/id1082768942)

This app turns your iOS device into a customizable display for sailing data. Crew members can independently view up to four SAILMON system values on their own devices, in either day or night mode, with automatic layout adjustments for orientation.

**Highlights:** Customizable data display, Up to 4 values simultaneously, Day and Night modes, Automatic orientation layout, Unlimited device support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ESA Instruments free?

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

### Is CrewView free?

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

### Do ESA Instruments or CrewView have ads?

Neither ESA Instruments nor CrewView shows ads.

### Which is updated more often, ESA Instruments or CrewView?

ESA Instruments ships an update every 6 months, and CrewView every 4 months. Most recently, ESA Instruments was updated on September 30, 2026 and CrewView on September 30, 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.*