# ESA Instruments vs SpearfishingSFG

The clearest difference is update cadence: SpearfishingSFG at every 3 months against ESA Instruments's every 6 months. ESA Instruments's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.0). On price, 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, SpearfishingSFG every 3 months. The most recent releases landed on October 16, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | ESA Instruments | SpearfishingSFG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spearfishingsfg/id6471902010/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 3 MB | 2 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Astra Yacht](https://appshunter.io/developer/516503620) | [Terrance Baptiste](https://appshunter.io/developer/1694152246) |

## What reviewers say

### ESA Instruments

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

**Features:** macOS Compatibility

**In-app purchases:** none


### SpearfishingSFG

[App page](https://appshunter.io/ios/app/spearfishingsfg/id6471902010)

This application helps determine optimal weather conditions for spearfishing in Saint Martin. It provides hourly weather snapshots and a basic equipment checklist.

**Highlights:** Optimal weather condition determination, Hourly weather snapshots, Basic spearfishing equipment checklist, Saint Martin specific conditions

**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 SpearfishingSFG free?

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

### Do ESA Instruments or SpearfishingSFG have ads?

Neither ESA Instruments nor SpearfishingSFG shows ads.

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

ESA Instruments ships an update every 6 months, and SpearfishingSFG every 3 months. Most recently, ESA Instruments was updated on October 16, 2026 and SpearfishingSFG on October 19, 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.*