# Propeller Calc vs Sparkling

The clearest difference is review sentiment: Propeller Calc at 100% against Sparkling's 50%. Propeller Calc also leads on rating (3.0 vs 1.5). Sparkling's advantage is update cadence (every 2 months vs every 21 months) and iOS requirement (12.0 vs 17.0). On price, ratings volume, 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.

Propeller Calc holds the better App Store score, 3.0 against 1.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews point the same way: 100% of Propeller Calc's written reviews are positive against 50% of Sparkling's.

Propeller Calc ships an update every 21 months, Sparkling every 2 months. The most recent releases landed on September 9, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Propeller Calc | Sparkling |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/propeller-calc/id478119478/reviews)** | [1.5 (2 ratings)](https://appshunter.io/ios/app/sparkling/id1614382922/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 3 MB | 16 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Frode Rørvik](https://appshunter.io/developer/478119481) | [Hangzhou Daniao Technology Co., Ltd](https://appshunter.io/developer/1484018559) |

## What reviewers say

### 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


### Sparkling

[App page](https://appshunter.io/ios/app/sparkling/id1614382922)

Control colored lights with your device. Sync lights to music, draw custom patterns, or display text. Offers a unique way to personalize your lighting experience.

**Highlights:** Point and control colored lights, Music synchronization for lights, Hand-drawn pattern creation, Text display functionality, Customizable lighting effects

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Propeller Calc free?

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

### Is Sparkling free?

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

### Which has better reviews, Propeller Calc or Sparkling?

Propeller Calc is rated higher. Propeller Calc averages 3.0 out of 5 from 1 ratings, while Sparkling averages 1.5 from 2 ratings.

### Do Propeller Calc or Sparkling have ads?

Neither Propeller Calc nor Sparkling shows ads.

### Which is updated more often, Propeller Calc or Sparkling?

Propeller Calc ships an update every 21 months, and Sparkling every 2 months. Most recently, Propeller Calc was updated on September 9, 2026 and Sparkling on September 18, 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.*