# Engine Calculator Plus vs Convertura

The clearest difference is price: Convertura at Free against Engine Calculator Plus's $2.99. Convertura also leads on update cadence (every 4 days vs every 48 months). Engine Calculator Plus's advantage is in-app purchases (none vs 3) and chart position (#183 vs unranked). On ads and device support there is nothing between them.

Convertura is free to download; Engine Calculator Plus costs $2.99 up front. Convertura sells 3 in-app purchases, starting at $1.99 per month. Engine Calculator Plus asks for nothing beyond the download.

Engine Calculator Plus ships an update every 48 months, Convertura every 4 days. The most recent releases landed on September 10, 2026 and February 28, 2026 respectively.

## The numbers

| Metric | Engine Calculator Plus | Convertura |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 4 days** |
| Monetization | Paid | — |
| Best chart rank | **#183** | — |
| Size | 2 MB | 4 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Hakan Akturk](https://appshunter.io/developer/1674844857) |

## What reviewers say

### Engine Calculator Plus

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

**Currently charting:** #183 Top Paid · Productivity (US App Store)

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


### Convertura

[App page](https://appshunter.io/ios/app/convertura/id6445921216)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Yearly Subscription | $6.99 | per year |
| Life Time Premium | $19.99 | one-time |


## Frequently asked questions

### Is Engine Calculator Plus free?

Engine Calculator Plus costs $2.99, with no in-app purchases.

### Is Convertura free?

Convertura is free to download, with in-app purchases available.

### Do Engine Calculator Plus or Convertura have ads?

Neither Engine Calculator Plus nor Convertura shows ads.

### Which is updated more often, Engine Calculator Plus or Convertura?

Engine Calculator Plus ships an update every 48 months, and Convertura every 4 days. Most recently, Engine Calculator Plus was updated on September 10, 2026 and Convertura on February 28, 2026.

---

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