Propeller Calc vs VL Flex Configurator
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
VL Flex Configurator
This app allows for contactless configuration of a universal gauge device. It enables users to set up instrument displays and transfer settings wirelessly with a simple tap.
- Contactless device configuration
- Wireless settings transfer
- User-friendly interface
- Single or dual layout display
- Alarm display
- Supports engine sensor inputs
- CAN interface for digital network data
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THE UNIVERSAL GAUGE The VL Flex device can easily replicate every analog instrument thanks to the sun-readable 1.44” TFT display embedded into a standard 52 mm satellite instrument. The supported analog inputs allow you to directly read from your engine sensors, and the CAN interface expands this possibility by allowing the device to read from the digital network. The simple but effective graphic design can be set up in a single or dual layout, presenting the data in a clear and intuitive form. The colored bar graph and the alarm display allow you to visually understand your data. CONTACTLESS DEVICE CONFIGURATION (Patent Pending) The VL Flex configurator is the easiest way to configure your VL Flex device! Thanks to the contactless configuration you can setup your all-in-one instrument with a simple tap! Launch the App and define your settings through the user-friendly interface, then simply hold your mobile device in proximity of the VL Flex device to transfer the configuration. Thanks to the embedded passive antenna the configuration can be done powerless! Discover more on www.veratron.com
Screenshots
Verdict
The clearest difference is review sentiment: Propeller Calc at 100% against VL Flex Configurator's 0%. VL Flex Configurator's advantage is rating (5.0 vs 3.0) and update cadence (every 2 months vs every 21 months). 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.
VL Flex Configurator holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews complicate that: 100% of Propeller Calc's written reviews are positive against 0% of VL Flex Configurator's, so the app with the better star average is not the one people write more warmly about.
Propeller Calc ships an update every 21 months, VL Flex Configurator every 2 months. The most recent releases landed on September 26, 2026 and October 24, 2026 respectively.
| Parameter | Propeller Calc | VL Flex Configurator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 1 | 1 |
| 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 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Frode Rørvik | Veratron AG |
Customer experience
Propeller Calc
VL Flex Configurator
In-app purchases
Propeller Calc
No in-app purchases
VL Flex Configurator
No in-app purchases
Questions
Is Propeller Calc free?
Is VL Flex Configurator free?
Which has better reviews, Propeller Calc or VL Flex Configurator?
Do Propeller Calc or VL Flex Configurator have ads?
Which is updated more often, Propeller Calc or VL Flex Configurator?
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