# Boating Calcs vs Propeller Calc

The clearest difference is price: Propeller Calc at Free against Boating Calcs's $1.99. Propeller Calc also leads on review sentiment (100% vs 81%). Boating Calcs's advantage is rating (4.8 vs 3.0) and ratings volume (27 vs 1). On ads, in-app purchases, monetization model and device support there is nothing between them.

Propeller Calc is free to download; Boating Calcs costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Boating Calcs holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Boating Calcs has 27 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 81% of Boating Calcs's written reviews are positive against 100% of Propeller Calc's, so the app with the better star average is not the one people write more warmly about.

Boating Calcs ships an update every 7 months, Propeller Calc every 21 months. The most recent releases landed on October 20, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Boating Calcs | Propeller Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.8 (27 ratings)](https://appshunter.io/ios/app/boating-calcs/id410592998/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/propeller-calc/id478119478/reviews) |
| Number of ratings | **27** | 1 |
| Positive reviews | 81.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 21 months |
| Monetization | Free | Free |
| Size | 17 MB | 3 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Calculated Industries](https://appshunter.io/developer/370406449) | [Frode Rørvik](https://appshunter.io/developer/478119481) |

## What reviewers say

### Boating Calcs

[App page](https://appshunter.io/ios/app/boating-calcs/id410592998)

This app offers over 120 boating calculations and unit conversions, along with 120 reference pages. Easily solve a variety of boating-related problems, save and share your calculations, and quickly find the tools you need. It includes extensive reference material across various boating disciplines.

**Highlights:** Over 120 boating calculations, Extensive unit conversions, 120+ reference pages, Save and open calculations, Add calculators to favorites, Email calculation inputs and results, Search functionality

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

**In-app purchases:** none


### Propeller Calc

[App page](https://appshunter.io/ios/app/propeller-calc/id478119478)

This utility calculates propeller performance metrics like pitch, gear ratio, RPM, slip, and speed. Input any four values, and the app computes the fifth, helping users understand the relationship between propeller design and boat performance.

**Highlights:** Calculate pitch, gear ratio, RPM, slip, and speed, Enter any four variables to find the fifth, Understand propeller slip and its impact, Supports iPhone and iPad, Free to use

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Boating Calcs free?

Boating Calcs costs $1.99, with no in-app purchases.

### Is Propeller Calc free?

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

### Which has better reviews, Boating Calcs or Propeller Calc?

Boating Calcs is rated higher. Boating Calcs averages 4.8 out of 5 from 27 ratings, while Propeller Calc averages 3.0 from 1 ratings.

### Do Boating Calcs or Propeller Calc have ads?

Neither Boating Calcs nor Propeller Calc shows ads.

### Which is updated more often, Boating Calcs or Propeller Calc?

Boating Calcs ships an update every 7 months, and Propeller Calc every 21 months. Most recently, Boating Calcs was updated on October 20, 2026 and Propeller Calc on September 26, 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.*