# Butterfly Training vs NAVsystem Briefing App

The clearest difference is update cadence: NAVsystem Briefing App at every 6 weeks against Butterfly Training's every 4 months. Butterfly Training's advantage is iOS requirement (9.0 vs 15.1). 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.

Butterfly Training ships an update every 4 months, NAVsystem Briefing App every 6 weeks. The most recent releases landed on September 24, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Butterfly Training | NAVsystem Briefing App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Size | 40 MB | 28 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BUTTERFLY AERO TRAINING](https://appshunter.io/developer/1481266120) | [NAV Flight Services s.r.o.](https://appshunter.io/developer/1750267713) |

## What reviewers say

### Butterfly Training

[App page](https://appshunter.io/ios/app/butterfly-training/id1153427889)

**Features:** macOS Compatibility

**In-app purchases:** none


### NAVsystem Briefing App

[App page](https://appshunter.io/ios/app/navsystem-briefing-app/id6503905286)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Butterfly Training free?

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

### Is NAVsystem Briefing App free?

NAVsystem Briefing App is free to download, with no in-app purchases.

### Do Butterfly Training or NAVsystem Briefing App have ads?

Neither Butterfly Training nor NAVsystem Briefing App shows ads.

### Which is updated more often, Butterfly Training or NAVsystem Briefing App?

Butterfly Training ships an update every 4 months, and NAVsystem Briefing App every 6 weeks. Most recently, Butterfly Training was updated on September 24, 2026 and NAVsystem Briefing App on October 13, 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.*