# ESA Instruments vs NotiWind

The clearest difference is update cadence: NotiWind at every 3 weeks against ESA Instruments's every 6 months. NotiWind also leads on iOS requirement (9.0 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, NotiWind every 3 weeks. The most recent releases landed on September 30, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | ESA Instruments | NotiWind |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 3 MB | 19 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astra Yacht](https://appshunter.io/developer/516503620) | [Luigi Arnaldo Paiella](https://appshunter.io/developer/782423575) |

## What reviewers say

### ESA Instruments

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

**Features:** macOS Compatibility

**In-app purchases:** none


### NotiWind

[App page](https://appshunter.io/ios/app/notiwind/id1286549186)

Get real-time wind notifications for your favorite watersports spots. Set custom notification times and minimum wind speeds to be alerted when conditions are right. Supports over 50 locations worldwide with data from real weather stations.

**Highlights:** Real-time wind notifications, Customizable notification times, Set minimum wind speed thresholds, Support for over 50 global spots, Data from real weather stations, Multiple notifications per spot

**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 NotiWind free?

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

### Do ESA Instruments or NotiWind have ads?

Neither ESA Instruments nor NotiWind shows ads.

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

ESA Instruments ships an update every 6 months, and NotiWind every 3 weeks. Most recently, ESA Instruments was updated on September 30, 2026 and NotiWind 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.*