Comparison

Engine Calculator Plus vs DNV Safety Inspections

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Engine Calculator Plus

Calculate engine specifications for various car and plane engines, including displacement, compression ratio, and horsepower. Supports metric and imperial systems with a user-friendly interface and 3D engine visualization.

Highlights
  • Engine displacement calculation
  • Compression ratio calculation
  • Horsepower estimation
  • Metric and Imperial support
  • 3D engine display
  • Copyable results
Features
Read full description

Engine Calculator Plus is designed to help you figure out engine specs for all car or plane engine types from inline 4 to V12 Engine. This calculator provides calculations for engine displacement based on either the metric or US standard system. Features: - User friendly UI - Engine type selection from single cylinder to complex W16 or even custom cylinder count. - Display 3D engine from selection - Metric or Imperial input - Output Engine Displacement on cc, liter and cubic inch - Output Compression ratio of engine - Calculate estimate horse power in HP and Kilowatts - Include formula to calculate the engine displacement in help page - Result are copy-able to other app The engine's static compression ratio is easily calculated if you know six measurements or volumes: Bore - The diameter of the cylinder bore Stroke - The distance the piston travels in the cylinder Deck Height - The distance between the top of the cylinder bore and the top of the piston, when the piston is at TDC (Top Dead Center, or at its highest position) Piston top volume - If the piston is dished, domed, or dimpled, that has an affect on compression ratio. Combustion chamber volume - How much open space is in the head above the cylinder Compression ratios: Higher compression ratios cylinder produces better power and fuel economy. It is not just because the charge is squeezed harder and the resulting combustion pressure goes up, but also because the higher expansion ratio allows more energy to be extracted from the original high-pressure. High compression ratio engines burn both much more cleanly and much more efficiently than lower-compression engines. However a lower compression motor will let you run cheap fuel, but your motor won't be as efficient, less efficient and less power. *Thanks for your support, stay tune for more update to come.

About

DNV Safety Inspections

Read full description

This mobile solution enables DNV inspectors to work digitally. This increases the quality of the inspection because the forms are standardized and data cannot be lost. In fact, the data can be used in many ways. Clear PDF reports containing sharp photos to properly record deviations found during the inspection provide an inspection report with which the customer can continue. The detected deviations are specially monitored in a ticket management system in the app. As a result, the customer and the inspector are aware of the ongoing processes and these can be managed. By performing the inspections digitally, it is possible to have the data connected in almost any other software product, so that action can be taken even better and faster on the detected deviations. Think, for example, of a dashboard with an overview of the deviations or a ticket management system of the customer.

Screenshots

Engine Calculator Plus4 screens
DNV Safety Inspections3 screens

Verdict

The call

The clearest difference is price: DNV Safety Inspections at Free against Engine Calculator Plus's $2.99. DNV Safety Inspections also leads on update cadence (every 4 weeks vs every 48 months). Engine Calculator Plus's advantage is iOS requirement (13 vs 17.0). On ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

DNV Safety Inspections is free to download; Engine Calculator Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Engine Calculator Plus ships an update every 48 months, DNV Safety Inspections every 4 weeks. The most recent releases landed on October 15, 2026 and October 21, 2026 respectively.

Scorecard3 real differences · 7 level
Engine Calculator Plus versus DNV Safety Inspections: the parameters behind the verdict, then further details
ParameterEngine Calculator PlusDNV Safety Inspections
Price$2.99Free — better
Rating4.0 (1 ratings) — better—
Positive reviews12.5% of reviews—
Number of ratings1 — better—
Update frequencyEvery 48 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13 — better17.0
Further details — not scored
Size2 MB38 MB
Age rating4+4+
DeveloperNitrioMaxd'Oro B.V.

In-app purchases

None

Engine Calculator Plus

No in-app purchases

None

DNV Safety Inspections

No in-app purchases

Questions

Is Engine Calculator Plus free?
Engine Calculator Plus costs $2.99, with no in-app purchases.
Is DNV Safety Inspections free?
DNV Safety Inspections is free to download, with no in-app purchases.
Do Engine Calculator Plus or DNV Safety Inspections have ads?
Neither Engine Calculator Plus nor DNV Safety Inspections shows ads.
Which is updated more often, Engine Calculator Plus or DNV Safety Inspections?
Engine Calculator Plus ships an update every 48 months, and DNV Safety Inspections every 4 weeks. Most recently, Engine Calculator Plus was updated on October 15, 2026 and DNV Safety Inspections on October 21, 2026.

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