# ESA Instruments vs Sail Scan

The clearest difference is update cadence: Sail Scan at daily against ESA Instruments's every 6 months. On price, ads, in-app purchases and device support 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, Sail Scan daily. The most recent releases landed on September 30, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | ESA Instruments | Sail Scan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sail-scan/id6762089009/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Daily** |
| Monetization | — | Free |
| Size | 3 MB | 34 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astra Yacht](https://appshunter.io/developer/516503620) | [Sail Scan LLC](https://appshunter.io/developer/6820238278) |

## What reviewers say

### ESA Instruments

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Sail Scan

[App page](https://appshunter.io/ios/app/sail-scan/id6762089009)

This app uses your phone's camera to analyze sail shape by reading trim stripes. It provides detailed measurements like camber depth, draft position, and twist, helping sailors make real-time adjustments to improve speed and performance. Save your scans, build a library, and connect rig settings to your progress on the water.

**Highlights:** AI-powered sail shape analysis, Measures camber depth, draft position, and twist, Works on mainsails and jibs, Real-time adjustments, Save and build sail scan library, Compare scans and track settings

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

**In-app purchases:** none


## Frequently asked questions

### Is ESA Instruments free?

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

### Is Sail Scan free?

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

### Do ESA Instruments or Sail Scan have ads?

Neither ESA Instruments nor Sail Scan shows ads.

### Which is updated more often, ESA Instruments or Sail Scan?

ESA Instruments ships an update every 6 months, and Sail Scan daily. Most recently, ESA Instruments was updated on September 30, 2026 and Sail Scan on October 15, 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.*