# EngineCalc vs ScreenRuler

The clearest difference is price: ScreenRuler at Free against EngineCalc's $0.99. ScreenRuler also leads on device support (3 vs 1) and iOS requirement (15.1 vs 26.0). On ads and in-app purchases there is nothing between them.

ScreenRuler is free to download; EngineCalc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | EngineCalc | ScreenRuler |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/enginecalc/id378824382/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | — |
| Monetization | Paid | — |
| Size | 13 MB | 26 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [iTrinity, Inc.](https://appshunter.io/developer/547108075) | [pilyeong heo](https://appshunter.io/developer/1835315150) |

## What reviewers say

### EngineCalc

[App page](https://appshunter.io/ios/app/enginecalc/id378824382)

This utility app provides a collection of essential formulas and calculators for powersports and engine tuning. It allows users to perform complex calculations directly on their iPhone, eliminating the need for a laptop or desktop computer.

**Highlights:** Powersports formulas, Engine tuning calculators, Actual Volume Flow, Air Density, Compression Ratio, Cylinder Displacement, Volumetric Efficiency

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ScreenRuler

[App page](https://appshunter.io/ios/app/screenruler-measure-length/id6761749448)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is EngineCalc free?

EngineCalc costs $0.99, with no in-app purchases.

### Is ScreenRuler free?

ScreenRuler is free to download, with no in-app purchases.

### Do EngineCalc or ScreenRuler have ads?

Neither EngineCalc nor ScreenRuler shows ads.

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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.*