# Engine Calculator Plus vs DNV Safety Inspections

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.

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.

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.

## The numbers

| Metric | Engine Calculator Plus | DNV Safety Inspections |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/engine-calculator-plus/id1355990764/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 4 weeks** |
| Monetization | Paid | — |
| Size | 2 MB | 38 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Maxd'Oro B.V.](https://appshunter.io/developer/380657828) |

## What reviewers say

### Engine Calculator Plus

[App page](https://appshunter.io/ios/app/engine-calculator-plus/id1355990764)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### DNV Safety Inspections

[App page](https://appshunter.io/ios/app/dnv-safety-inspections/id1590493949)

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*