# mIBS vs Vnav4+

The clearest difference is update cadence: Vnav4+ at daily against mIBS's every 49 months. mIBS's advantage is iOS requirement (15.6 vs 17.0). 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.

mIBS ships an update every 49 months, Vnav4+ daily. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | mIBS | Vnav4+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/vnav4-plus/id6478510518/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Daily** |
| Monetization | — | Free |
| Size | 4 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [FREQUENTIS California Inc.](https://appshunter.io/developer/1158591671) | [William Downing](https://appshunter.io/developer/1158046062) |

## What reviewers say

### mIBS

[App page](https://appshunter.io/ios/app/mibs-lgs/id1462954698)

**Features:** macOS Compatibility

**In-app purchases:** none


### Vnav4+

[App page](https://appshunter.io/ios/app/vnav4-plus/id6478510518)

This navigation app offers four specialized calculators for vertical flight path management. It includes tools for general climb/descent rates, instrument procedure descent angles, obstacle departure climb rates, and top of descent calculations.

**Highlights:** Generic rate of climb calculator, Generic rate of descent calculator, Instrument procedure descent angle calculator, Obstacle departure rate of climb calculator, Top of descent calculator

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is mIBS free?

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

### Is Vnav4+ free?

Vnav4+ is free to download, with no in-app purchases.

### Do mIBS or Vnav4+ have ads?

Neither mIBS nor Vnav4+ shows ads.

### Which is updated more often, mIBS or Vnav4+?

mIBS ships an update every 49 months, and Vnav4+ daily. Most recently, mIBS was updated on October 6, 2026 and Vnav4+ on October 17, 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.*