# Secret KB vs NavCalc Dynamic

The clearest difference is price: NavCalc Dynamic at Free against Secret KB's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

NavCalc Dynamic is free to download; Secret KB costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Secret KB ships an update every 10 days, NavCalc Dynamic every 6 days. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Secret KB | NavCalc Dynamic |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/navcalc-dynamic/id1638841716/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 6 days** |
| Monetization | — | Free |
| Size | 6 MB | 15 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Asadullah Jamadar](https://appshunter.io/developer/1655125846) | [Richard Craddock](https://appshunter.io/developer/1579756955) |

## What reviewers say

### Secret KB

[App page](https://appshunter.io/ios/app/secret-kb/id1605391634)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### NavCalc Dynamic

[App page](https://appshunter.io/ios/app/navcalc-dynamic/id1638841716)

This app calculates the course and speed needed to counteract current and wind effects for navigation. It visually displays these calculations on a compass rose, dynamically updating as parameters change. Useful for learning and solving real-world sailing problems.

**Highlights:** Calculate Course to Steer (CtS), Calculate Speed over Ground (SoG), Visual compass rose display, Dynamic parameter updates, Magnetic variation input, Leeway and wind direction input

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Secret KB free?

Secret KB costs $0.99, with no in-app purchases.

### Is NavCalc Dynamic free?

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

### Do Secret KB or NavCalc Dynamic have ads?

Neither Secret KB nor NavCalc Dynamic shows ads.

### Which is updated more often, Secret KB or NavCalc Dynamic?

Secret KB ships an update every 10 days, and NavCalc Dynamic every 6 days. Most recently, Secret KB was updated on October 18, 2026 and NavCalc Dynamic on October 24, 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.*