# EngineCalc vs Rollout Calculator

The clearest difference is price: Rollout Calculator at Free against EngineCalc's $0.99. Rollout Calculator also leads on rating (4.9 vs 3.0) and update cadence (every 2 months vs every 22 months). EngineCalc's advantage is ads (none vs shown). On ratings volume and in-app purchases there is nothing between them.

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

Rollout Calculator holds the better App Store score, 4.9 against 3.0. Both are backed by a comparable volume of ratings — 4 and 11 respectively.

EngineCalc ships an update every 22 months, Rollout Calculator every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | EngineCalc | Rollout Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/enginecalc/id378824382/reviews) | **[4.9 (11 ratings)](https://appshunter.io/ios/app/rollout-calculator-rc-dd-car/id6451037467/reviews)** |
| Number of ratings | 4 | **11** |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 22 months | **Every 2 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 13 MB | 8 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [iTrinity, Inc.](https://appshunter.io/developer/547108075) | [Takao Ichimura](https://appshunter.io/developer/1474061593) |

## 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


### Rollout Calculator

[App page](https://appshunter.io/ios/app/rollout-calculator-rc-dd-car/id6451037467)

This utility app calculates the travel distance of an RC direct drive car per motor rotation. It simplifies setup by displaying results in three easy-to-read tables, allowing users to select gear teeth and tire diameter.

**Highlights:** Rollout distance calculation, Three display tables, Pinion and spur gear selection, Tire diameter input, Pitch setting

**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 Rollout Calculator free?

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

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

Rollout Calculator is rated higher. EngineCalc averages 3.0 out of 5 from 4 ratings, while Rollout Calculator averages 4.9 from 11 ratings.

### Do EngineCalc or Rollout Calculator have ads?

Rollout Calculator shows ads; EngineCalc does not.

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

EngineCalc ships an update every 22 months, and Rollout Calculator every 2 months. Most recently, EngineCalc was updated on November 2, 2026 and Rollout Calculator on November 3, 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.*