Propeller Calc vs Sparkling
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Propeller Calc
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.
- 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
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This calculator can determine pitch, gear ratio, RPM, propeller slip and speed parameters. Enter any four variables, and it will calculate the fifth. Use the toggle switch to choose which field to calculate. Pitch is the theoretical forward movement for one complete turn of the propeller. Every inch of the boat in contact with the water induces drag. Therefore, the distance travelled differs since the propeller is "slipping" behind the theoretical distance it should travel with each rotation. The difference between theory and reality is called slip. Depending on your application, slip typically ranges between 5% and 20%. A lower number is only sometimes what you are after. Slip of a prop changes with operating conditions and is not a direct measure of efficiency. Please consult professionals for guidance. Happy powerboating
Sparkling
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.
- Point and control colored lights
- Music synchronization for lights
- Hand-drawn pattern creation
- Text display functionality
- Customizable lighting effects
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Sparkling is an app used to control the point and control the colored lights. It can display the lights through music, and can also directly draw patterns by hand or text display.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Propeller Calc | Sparkling |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | 1.5 (2 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 21 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Frode Rørvik | Hangzhou Daniao Technology Co., Ltd |
Customer experience
Propeller Calc
Sparkling
In-app purchases
Propeller Calc
No in-app purchases
Sparkling
No in-app purchases
Questions
Is Propeller Calc free?
Is Sparkling free?
Which has better reviews, Propeller Calc or Sparkling?
Do Propeller Calc or Sparkling have ads?
Which is updated more often, Propeller Calc or Sparkling?
Other comparisons
