# Circuit Laboratory HD

> Electronic circuit analysis and simulation tool with graphical design. (iPhone/iPad app by Fabrizio Boco.)

- Source: https://appshunter.io/ios/app/circuit-laboratory-hd/id1056997109 (this page in markdown: same URL + `.md`)
- Developer: [Fabrizio Boco](https://appshunter.io/developer/466239616)
- Category: Productivity, Business
- Price: $6.99
- Age rating: 4+
- Requires: iOS 12.4 · 180 MB
- Languages: American English, Italian
- Released: 2015-11-13
- Data updated: 2026-08-19
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/circuit-laboratory-hd/id1056997109/reviews.md

## What is Circuit Laboratory HD?

Circuit Lab HD is an electronic circuit analysis tool based on the modified node analysis method. It uses the same models of Spice.

Four kind of analysis may be conducted: 

- DC: linear and non linear circuits with continuous voltage and current sources; 
- AC: linear and non linear circuits with sinusoidal voltage and current sources;
- Multifrequency AC Analysis: linear and non linear circuits with sinusoidal voltage and current sources. It allows to analyze the circuit behavior in a range of frequencies. Useful to study the bandwidth of the circuit;
- Transient: linear and non linear circuits, with sinusoidal and pulse voltage sources. 

User can graphically draw the circuit dragging and dropping components, then the circuit can be analyzed. 

Circuit may be controlled by means of the following gestures: 

- Drag: to move the circuit into the desired position 
- Tap on a component: to modify the component's parameters 
- Pinch: to zoom in and out 
- Double finger double Tap: to reset position and zoom level to the original values 

Tapping DC button, user gets voltage at each circuit's node. 

Tapping AC button, user gets voltage phasors at each circuit node or the bode graph of the 
voltage at each circuit node (see 06 BJT - Common Emitter). 

User can select the desired phasors to get the related graphs which may be controlled by means of the following gestures: 

- Drag: To move the chart in the desired position; 
- Pinch: To enlarge or shrinks the graph; 
- Double Tap with two fingers to restore the position and zoom level to the original values. 

Tapping Transient button, user can analyze circuit's behavior during time and get graphs of voltages and currents 
function of time. These graphs may be controlled by means of the following gestures: 

- Drag: To move the chart in the desired position; 
- Pinch: To enlarge or shrinks the graph; 
- Double Tap with two fingers to restore the position and zoom level to the original values. 

Moreover, user can enable a mobile cursor to read the values ​​in the different points of time (tap on the graph to display the cursor, tap to remove it and move it to read the values​​). 

Each circuit can contain: 

- Resistors 
- Capacitors 
- Inductors 
- Mutual coupled inductors 
- Independent sinusoidal voltage generators 
- Independent voltage pulse generators (with which you can also generate square, triangular and sawtooth waves); 
- Independent sinusoidal current generators 
- Controlled voltage generators 
- Controlled current generators 
- Operation Amplifier 
- Diodes 
- Zener Diodes 
- NPN and PNP Bjts 
- Channel-N and Channel-P JFet
- Channel-N and Channel-P Mosfet

In addition, there are the following measuring instruments: 

- Voltmeter; 
- Ammeter. 

User can manage his own components library to store most used components.

For each component, a short video is available to demonstrate how to insert it into the circuit and edit it's characteristics. In addition, there are some more detailed video tutorials to learn how to use the application. 

Circuits may be easily stored and reused. 

User can print: 

- Circuits and component's list 
- Transient Analysis graphs (the mobile cursor is also printed if visible) 

Circuits can be easily shared through iCloud, by mail in the internal format so that can be reused by other users (on iPhone too) and in PDF format and they are compatible with Circuit Lab for Mac.

Visit my site for video tutorials and details about operational amplifier's internal model, diode's internal model and Bjt's internal model.

## Key features

- Graphical circuit design
- DC analysis
- AC analysis
- Multifrequency AC analysis
- Transient analysis
- Component library
- Measuring instruments

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/circuit-laboratory-hd/id1056997109/reviews.md

### 1/5 — Bad graphics, unfit for iPadOS 17.5

*2024-07-28, version 2.3*

-Scaling problems and no graph overlay in multi frequency AC analysis results.
-Text and background colours make parts of the GUI barely readable.
-Can not enter parameters for component values.

Needs thorough update to be of any practical use on my iPad running iPadOS 17.5.
Like the old school circuit inputing method though…

### 1/5 — Blocage du programme

*2018-04-20, version 2.1*

Lorsque. Je tape sur un des circuits de démonstration le programme bloque et plus rien ne se passe ???
J’ai un iPad mini de 32 G. Et le dernier IOS 11

## Frequently asked questions about Circuit Laboratory HD

### What types of circuit analysis does Circuit Laboratory HD support?

Circuit Laboratory HD supports four main types of analysis: DC analysis for linear and non-linear circuits, AC analysis for sinusoidal sources, Multifrequency AC analysis to study bandwidth across a range of frequencies, and Transient analysis for time-domain behavior with sinusoidal and pulse sources.

### Can I build circuits graphically in Circuit Laboratory HD?

Yes, you can graphically draw circuits by dragging and dropping components. The app offers intuitive gestures for moving, zooming, and editing components within the circuit.

### What electronic components are available in Circuit Laboratory HD?

The app includes a comprehensive set of components such as resistors, capacitors, inductors, various voltage and current generators, operational amplifiers, diodes, BJTs, JFETs, and MOSFETs. It also features integrated voltmeter and ammeter instruments.

### Does Circuit Laboratory HD offer a way to save and reuse components?

Yes, users can manage their own component library to store and quickly access frequently used components, streamlining the design process.

### How does Circuit Laboratory HD handle viewing analysis results?

Analysis results are presented graphically. For DC analysis, node voltages are provided. For AC and Transient analysis, users can view voltage and current phasors or graphs as a function of time, with interactive controls for navigation and value reading.

### Is Circuit Laboratory HD available on multiple devices?

Based on the provided data, Circuit Laboratory HD is currently supported on iPads.

### How often is Circuit Laboratory HD updated?

The app was last updated on December 4, 2023, indicating ongoing support and potential for future improvements and bug fixes.

### Does Circuit Laboratory HD have ads?

No, Circuit Laboratory HD does not contain advertisements, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 2.3 — 2023-12-04

Fixes and improvements

### 2.2 — 2020-08-29

Bug fixing

### 2.1 — 2017-09-19

Updated to iOS 11
Pulse Voltage Generator: Added a reference waveform to help user to enter signal information
Keyboard to enter scale factors now has larger and more visible buttons

### 2.0 — 2017-06-06

- Designing new circuits is made easier and faster by dragging and dropping components
- Graphs improved and bug fixed
- New and more useful example circuits
- Renewed graphics

### 1.0 — 2015-11-13

No release notes.

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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)
- [DCircuit Lab HD](https://appshunter.io/ios/app/dcircuit-lab-hd/id392966166)
- [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 2026-08-19.*