# DCircuit Lab HD

> Digital circuit simulator for combinatorial and sequential logic. (iPhone/iPad app by Fabrizio Boco.)

- Source: https://appshunter.io/ios/app/dcircuit-lab-hd/id392966166 (this page in markdown: same URL + `.md`)
- Developer: [Fabrizio Boco](https://appshunter.io/developer/466239616)
- Category: Productivity, Education
- Price: $6.99
- Rating: 1.00/5 from 1 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 84 MB
- Languages: English, Italian
- Released: 2010-09-23
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/dcircuit-lab-hd/id392966166/reviews.md

## What is DCircuit Lab HD?

DCircuit Lab HD is a tool for simulating combinatorial and sequential digital circuits.

Circuits can be simulated in two ways: 

1) one single step: all the outputs values are evaluated at the same time. 

2) step by step: outputs and gates are evaluated one step a time. This shows how each gate's output changes and how changes propagate through the circuit. This feature is very useful to understand complex circuits behavior. 
At the end of each simulation step, each gate may have a different color: 

    ￭ black: gate's output unchanged during the just ended simulation step 
    ￭ dark green: gate's output evaluated during the just ended simulation step 
    ￭ light green: gate's output evaluated during the just ended simulation step, gate needs to be evaluated again during the next simulation step 
    ￭ blue: gate needs to be evaluated during the next simulation step 

At the end of the simulation, each wire's color corresponds to the digital value carried on itself: red for 1 and gray for 0. 

If circuit contains clock inputs, it's simulation is dynamic. This means that outputs change accordingly to the clocks. During this dynamic simulation, user can change inputs values to study the circuit behavior. Once the simulation is stopped, a circuit timing chart is available.

Circuits are built using basic components, gates and flip-flops:

    ￭ input pins 
    ￭ output pins 
    ￭ clock
    ￭ wires 
    ￭ 2 inputs and 3 inputs AND gates 
    ￭ 2 inputs and 3 inputs NAND gates 
    ￭ 2 inputs OR gates 
    ￭ 2 inputs NOR gates 
    ￭ 2 inputs XOR gates 
    ￭ NOT gates 
    ￭ Flip-flop RS, JK, T, D 
    ￭ Multiplexer (4 outputs) 
    ￭ Demultiplexer (4 inputs) 

Circuits may be controlled by means of the following gesture: 

    ￭ Drag: to move the circuit into the desired position 
    ￭ Tap on a gate: to modify the gate 
    ￭ Double Tap on a gate: to modify the gate 
    ￭ Double Tap on a input pin: change its value from 1 to 0 or from 1 to 0
    ￭ Pinch: to zoom in and out 
    ￭ Double finger double Tap: to reset position and zoom level to the original values 

Circuits may be easily stored and reused. 

Some video tutorials are available to learn using the application. Visit the site to see the tutorials.

## Key features

- Combinatorial and sequential circuit simulation
- Step-by-step and dynamic simulation modes
- Visual gate and wire state indicators
- Circuit timing chart
- Extensive component library (gates, flip-flops, etc.)
- Gesture-based controls for manipulation
- Circuit saving and reuse

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/dcircuit-lab-hd/id392966166/reviews.md

### 1/5 — Doesn't work well

*2016-05-12, version 1.4*

I tried to use this app. I looked it expecting it to be a great simulator. But then when I even tried to create a circuit, it doesn't even place the elements most of the time. It works the first time then I cannot get it to put another circuit component. It's janky and is completely not user friendly. Not worth the $6.

### 1/5 — Unstable and non-intuitive

*2011-12-13, version 1.0.1*

This app is awkward and non-intuitive. I could not figure out the UI without first watching some (poorly made) video tutorials. The tutorials were almost as painful to watch as this app is to use. Separate and distinct from its awkwardness, it crashes frequently.

I don't enjoy writing negative reviews, but neither do I enjoy spending several dollars for an app that makes me feel ripped off and angry. If this app is, at some later date, vastly improved, I'd be glad to re-review it. Until then, this uninspired app gets a big thumbs down.

### 1/5 — hard to use

*2011-05-01, version 1.0.1*

Not easy to use, Tried it with a know working circuit and it did not work. I only got 1 out of three try's to work, but then the app crashed.

### 2/5 — Crashes

*2011-02-20, version 1.0.1*

The graph button crashes it everytime.

### 3/5 — Nice, but.....

*2010-09-25, version 0*

Very nice tutorials built in.  Easy to create and run circuits, although clock/output seems to be slightly glitchy.  Gates have no propagation delay - infinitely fast switching.  Does not seem to allow dragging components to new positions after creation.  Crashes occasionally without warning - save often.  Pinch&zoom allows circuits to be created at larger size than default (nice for big fingers) but image on screen is fuzzy.  No mention that I could find for VGA-out support - would be nice for classroom demos if available (haven't tested to see if capability present).

## Frequently asked questions about DCircuit Lab HD

### What is DCircuit Lab HD used for?

DCircuit Lab HD is a tool for simulating combinatorial and sequential digital circuits. It allows users to build and test circuits using various gates and components, visualize signal propagation, and analyze circuit behavior.

### How does DCircuit Lab HD simulate circuits?

It offers two simulation modes: one single step where all outputs are evaluated simultaneously, and step-by-step evaluation to observe how changes propagate through the circuit. Dynamic simulation is available for circuits with clock inputs.

### What components are available in DCircuit Lab HD?

The app includes basic components like input pins, output pins, clocks, wires, and a variety of gates (AND, NAND, OR, NOR, XOR, NOT) and flip-flops (RS, JK, T, D). It also features multiplexers and demultiplexers.

### How much does DCircuit Lab HD cost?

DCircuit Lab HD is a paid application, priced at $6.99. There are no in-app purchases mentioned.

### What devices is DCircuit Lab HD compatible with?

Currently, DCircuit Lab HD is supported on iPads. It is rated for ages 4 and up.

### How often is DCircuit Lab HD updated?

The app was last updated on August 29, 2020, to version 2.1. The release date was September 23, 2010.

### Does DCircuit Lab HD have tutorials?

Yes, video tutorials are available to help users learn how to use the application. You can visit the developer's site for these resources.

### What is the user feedback on DCircuit Lab HD?

Based on the provided data, DCircuit Lab HD has a rating of 1.0 stars from 1 rating. This indicates very limited user feedback available.

## Version history (last 1 release)

### 2.1 — 2020-08-29

Bug Fixing

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## More apps by Fabrizio Boco

- [Matrix Lab](https://appshunter.io/ios/app/matrix-lab/id337754158)
- [DCircuit Lab](https://appshunter.io/ios/app/dcircuit-lab/id382544208)
- [Bode & Nyquist](https://appshunter.io/ios/app/bode-and-nyquist/id445573307)
- [Arduino Manager](https://appshunter.io/ios/app/arduino-manager/id497240094)
- [Logic Analyzer](https://appshunter.io/ios/app/logic-analyzer/id980880317)

All apps by Fabrizio Boco: https://appshunter.io/developer/466239616

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*