# ESA Instruments vs SailHub

The clearest difference is update cadence: ESA Instruments at every 6 months against SailHub's every 17 months. SailHub's advantage is iOS requirement (11.0 vs 15.6). 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, SailHub every 17 months. The most recent releases landed on October 16, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ESA Instruments | SailHub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sailhub/id1470200104/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 17 months |
| Monetization | — | Free |
| Size | 3 MB | 27 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astra Yacht](https://appshunter.io/developer/516503620) | [Marine Ventures LLC](https://appshunter.io/developer/1200646813) |

## What reviewers say

### ESA Instruments

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

**Features:** macOS Compatibility

**In-app purchases:** none


### SailHub

[App page](https://appshunter.io/ios/app/sailhub/id1470200104)

This app provides sailing instructors with comprehensive performance data for each boat and student. It allows students to receive wind information and performance metrics without needing their own instruments. Features include synchronized countdowns and messaging for seamless class coordination.

**Highlights:** Real-time performance data, Wind information for students, Synchronized countdown timer, Group messaging service, Class performance analysis, Student improvement tracking

**In-app purchases:** none


## Frequently asked questions

### Is ESA Instruments free?

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

### Is SailHub free?

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

### Do ESA Instruments or SailHub have ads?

Neither ESA Instruments nor SailHub shows ads.

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

ESA Instruments ships an update every 6 months, and SailHub every 17 months. Most recently, ESA Instruments was updated on October 16, 2026 and SailHub on October 11, 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.*