# EngineCalc vs Compression Calculator

EngineCalc and Compression Calculator both sit at 3.0 stars, but that hides the real split: 67% of EngineCalc's written reviews are positive against 0% of Compression Calculator's. Compression Calculator's advantage is price (Free vs $0.99) and update cadence (every 9 days vs every 22 months). On rating, ratings volume, ads and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 3.0 for EngineCalc against 3.0 for Compression Calculator. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews are what separate them: 67% of EngineCalc's written reviews are positive against 0% of Compression Calculator's.

EngineCalc ships an update every 22 months, Compression Calculator every 9 days. The most recent releases landed on October 11, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | EngineCalc | Compression Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/enginecalc/id378824382/reviews) | [3.0 (3 ratings)](https://appshunter.io/ios/app/compression-calculator/id1421927149/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 9 days** |
| Monetization | Paid | **Free** |
| Size | 13 MB | 10 MB |
| Requires iOS | 26.0 | **11.4** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [iTrinity, Inc.](https://appshunter.io/developer/547108075) | [Peter Linszter](https://appshunter.io/developer/530077583) |

## 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


### Compression Calculator

[App page](https://appshunter.io/ios/app/compression-calculator/id1421927149)

Calculate engine compression, displacement, and piston speed using specific Honda engine parameters. Select engine components to get precise calculations for your automotive needs.

**Highlights:** Engine compression calculation, Displacement calculation, Piston speed calculation, Honda B, D, H/F, K-Series engine support, Component selection for custom calculations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EngineCalc free?

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

### Is Compression Calculator free?

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

### Which has better reviews, EngineCalc or Compression Calculator?

EngineCalc and Compression Calculator are both rated 3.0 out of 5 on the App Store, from 4 and 3 ratings respectively.

### Do EngineCalc or Compression Calculator have ads?

Neither EngineCalc nor Compression Calculator shows ads.

### Which is updated more often, EngineCalc or Compression Calculator?

EngineCalc ships an update every 22 months, and Compression Calculator every 9 days. Most recently, EngineCalc was updated on October 11, 2026 and Compression Calculator on September 30, 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.*