RIDGID Level vs Propeller Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RIDGID Level
This utility app uses your phone's sensors to provide precise leveling and plumb measurements. It features three vials for plumb, level, and 45° angles, with an option to overlay readings on your camera view. Calibration is available to ensure accuracy.
- Plumb, level, and 45° miter vials
- Real-time measurement display
- Camera overlay for leveling information
- Vertical and horizontal vial calibration
- Sensor-based accuracy
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RIDGID Level features three vials for plumb, level and 45° miter. The display shows the exact measurements currently being reported by the sensors and it supports overlaying leveling information on top of the camera. The application also allows you to calibrate both the vertical and horizontal vials for phones with buttons on the side or cameras on the rear which can interfere with your readings.
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
Screenshots
Verdict
The clearest difference is review sentiment: Propeller Calc at 100% against RIDGID Level's 43%. RIDGID Level's advantage is rating (3.9 vs 3.0) and ratings volume (40 vs 1). On price, update cadence, 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.
RIDGID Level holds the better App Store score, 3.9 against 3.0. That said, the two scores are not equally well evidenced: RIDGID Level has 40 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 43% of RIDGID Level'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.
RIDGID Level ships an update every 13 months, Propeller Calc every 21 months. The most recent releases landed on August 18, 2026 and September 9, 2026 respectively.
| Parameter | RIDGID Level | Propeller Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (40 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 43.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 40 — better | 1 |
| Update frequency | Every 13 months — better | Every 21 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 16 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | RIDGID Software Solutions | Frode Rørvik |
Customer experience
RIDGID Level
Propeller Calc
In-app purchases
RIDGID Level
No in-app purchases
Propeller Calc
No in-app purchases
Questions
Is RIDGID Level free?
Is Propeller Calc free?
Which has better reviews, RIDGID Level or Propeller Calc?
Do RIDGID Level or Propeller Calc have ads?
Which is updated more often, RIDGID Level or Propeller Calc?
Other comparisons
