# DCircuit Lab vs Engine Horsepower Calculator

The clearest difference is rating: Engine Horsepower Calculator at 4.2 against DCircuit Lab's 3.0. Engine Horsepower Calculator also leads on price ($2.99 vs $3.99) and iOS requirement (13 vs 17.0). DCircuit Lab's advantage is update cadence (every 10 months vs every 29 months). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

DCircuit Lab costs $3.99 and Engine Horsepower Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Engine Horsepower Calculator holds the better App Store score, 4.2 against 3.0. Both are backed by a comparable volume of ratings — 3 and 6 respectively.

DCircuit Lab ships an update every 10 months, Engine Horsepower Calculator every 29 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | DCircuit Lab | Engine Horsepower Calculator |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | [3.0 (3 ratings)](https://appshunter.io/ios/app/dcircuit-lab/id382544208/reviews) | **[4.2 (6 ratings)](https://appshunter.io/ios/app/engine-horsepower-calculator/id1095000562/reviews)** |
| Number of ratings | 3 | **6** |
| Positive reviews | 11.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 29 months |
| Monetization | Paid | Paid |
| Size | 3 MB | 1 MB |
| Requires iOS | 17.0 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Fabrizio Boco](https://appshunter.io/developer/466239616) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### DCircuit Lab

[App page](https://appshunter.io/ios/app/dcircuit-lab/id382544208)

Design and simulate digital circuits with a comprehensive set of tools. Explore combinatorial and sequential logic, including gates, flip-flops, and custom components. Dynamic simulation with timing charts helps analyze circuit behavior.

**Highlights:** Combinatorial and sequential circuit simulation, Single-step and step-by-step simulation modes, Dynamic simulation with timing charts, Wide range of logic gates and flip-flops, Custom component creation via truth tables, Integrated video tutorials

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

**In-app purchases:** none


### Engine Horsepower Calculator

[App page](https://appshunter.io/ios/app/engine-horsepower-calculator/id1095000562)

Estimate your vehicle's engine horsepower using different calculation methods based on weight, time, and speed. This tool provides estimations for quarter-mile runs.

**Highlights:** Estimate engine horsepower, Quarter-mile run calculations, ET Method calculation, Trap-speed Method calculation, RPM Torque Method calculation, Vehicle weight input

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

**In-app purchases:** none


## Frequently asked questions

### Is DCircuit Lab free?

DCircuit Lab costs $3.99, with no in-app purchases.

### Is Engine Horsepower Calculator free?

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

### Which has better reviews, DCircuit Lab or Engine Horsepower Calculator?

Engine Horsepower Calculator is rated higher. DCircuit Lab averages 3.0 out of 5 from 3 ratings, while Engine Horsepower Calculator averages 4.2 from 6 ratings.

### Do DCircuit Lab or Engine Horsepower Calculator have ads?

Neither DCircuit Lab nor Engine Horsepower Calculator shows ads.

### Which is updated more often, DCircuit Lab or Engine Horsepower Calculator?

DCircuit Lab ships an update every 10 months, and Engine Horsepower Calculator every 29 months. Most recently, DCircuit Lab was updated on October 23, 2026 and Engine Horsepower Calculator on October 24, 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.*