Propeller Calc vs Abyss Battery
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
Abyss Battery
Monitor your battery's live status, including voltage and amp consumption, via a wireless app interface. Diagnose battery health with Bluetooth reports and track charging habits and usage history, such as completed life cycles.
- Live battery status monitoring
- Bluetooth diagnostic reports
- Charging control and monitoring
- Battery history and life cycle tracking
- Wireless app interface
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Abyss Battery® Monitor lets you get live status info from your battery with built-in bluetooth support. -LIVE DATA: Connect to your Abyss Battery through our wireless app interface and let the phone act as a fuel gauge, monitor voltage, amp consumption and more all on the palm of your hand. -BATTERY HEALTH: Check health statuses such as faults or error codes with Bluetooth Diagnostic Reports. -CHARGING: Take Control, monitor when and how you charge your battery. -LIFE CYCLES: Record Battery History usage patterns like cycles completed and more.
Screenshots
Verdict
The clearest difference is rating: Abyss Battery at 5.0 against Propeller Calc's 3.0. Abyss Battery also leads on update cadence (every 8 months vs every 21 months) and ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model 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.
Abyss Battery holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Propeller Calc ships an update every 21 months, Abyss Battery every 8 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | Propeller Calc | Abyss Battery |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 21 months | Every 8 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Frode Rørvik | Abyss Battery, Inc. |
Customer experience
Propeller Calc
Abyss Battery
In-app purchases
Propeller Calc
No in-app purchases
Abyss Battery
No in-app purchases
Questions
Is Propeller Calc free?
Is Abyss Battery free?
Which has better reviews, Propeller Calc or Abyss Battery?
Do Propeller Calc or Abyss Battery have ads?
Which is updated more often, Propeller Calc or Abyss Battery?
Other comparisons
