LoCAD

LoCAD

Logic circuits on the iPad

2 ratings
7 reviews
$1.99
In-App Purchases

Details

  • Released
  • Updated
  • August 25, 2014
  • February 21, 2026
LoCAD screenshot #1 for iPad
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About

Design and simulate digital logic circuits with an emphasis on simple creation and graphical visualization. Easily wire elements, observe current flow, and understand state changes to improve comprehension and fault detection. Create custom integrated circuits for complex, organized designs.

Digital circuit design
Logic simulation
Graphical visualization
Simple element wiring
Custom IC creation
State change observation
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What's New in LoCAD

9.3

February 21, 2026

This update fixes • the bug that prevents input and decision windows from being displayed in iOS 26 • the problem with loading and saving circuits caused by a change in iOS 26

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In-App Purchases

$2.99

Full version

iOS_Full_version

User reviews

Au weia

Also irgendwie wirkt das nicht so ausgereift

Excellent

I am a retired physician and an electronics hobbyist. I came upon LoCAD after some success and excitement with electronic simulation programs like icircuit. I was surprised that LoCAD was not really reviewed! At first I thought that it was simply a simulator, like iCircuit. But I discovered that it was also an entire educational course that teaches Boolean electronic concepts.

LoCAD is a simulator available for the Mac or iPad (apparently, it also works on Vision Pro!) in combination with two iBooks on electronic logic and microprocessors. With the LoCAD program you can teach yourself how a microprocessor works FROM THE TRANSISTOR LEVEL UP. The books show how basic digital Boolean gates are made. With the Boolean gates and their combinations (provided), you can make your own complex integrated circuits. Using the books and the program together will allow you to make a simple microprocessor with its own assembly language in short order.

LoCAD LV is the free MacOS version. A maximum of 9 components can be used with this version. The LV version can be upgraded to a full version. The LoCAD SV version is the MacOS school version, which already contains the activation for the full version to enable distribution via the Apple School Manager.

LoCAD and LoCAD Lite are the iOS versions that run on iPad and via Mac Catalyst on Macs. LoCAD is the full version, and in the free Lite version a maximum of 13 components can be used.



My advice is to purchase the LoCad full version and the two iBooks when you start.

I think people are downloading this program and not purchasing the inexpensive, well-written books which make the programming SO MUCH more understandable, unless perhaps you are already an EE chip designer. The LoCAD interface does not always adhere to the Mac interface (zooming, moving on the work area, right click menus for example), so there is a bit of a learning curve with the program interface.

The iBooks on the Mac did not allow text size adjustments, perhaps because that would interfere with the interactive examples. I have not yet explored the same parts of the iBook and program on the iPad. Overall it really is an amazing introduction to electronic logic and its application. If you want to try it, purchase the two iBooks along with LoCad. With a little effort you won't be disappointed.

Thank you Karl for the education!
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Das Geld nicht wert

Schade um das Geld, App geht sofort in den Hintergrund, sobald ich etwas bearbeiten möchte und die Auswahl der Bauelemente ist rudimentär

Great app but a problem

I love this app! I can’t toggle the switches when the clock pulse generator is running.

Response from developer

This functionality will be enabled in version 4.2.

Beste App dieser Art.

Die App lässt Schaltkreise leicht und übersichtlich bauen und man kann gut damit lernen wie z.b. Ein Computer funktioniert oder einfach ein wenig rum probieren.
Das einzige was zu bemängeln ist sind noch ab und zu abstürzte.
Ein Kurzschluss Problem wurde zügig behoben und der Entwickler hat schnell auf emails geantwortet. Mittlerweile funktionieren alle Schaltungen ohne Kurzschluss.
Nur 2 Schalter an einer leitung verhalten sich etwas seltsam was aber nicht wirklich schlimm ist.

TL:DR : Gute App, guter Support
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Developer apps

FAQ

What is LoCAD?

LoCAD is a software application designed for creating and simulating digital logic circuits. It focuses on making circuit design intuitive and visually clear, allowing users to easily understand how circuits function.

How does LoCAD help in learning?

LoCAD enhances understanding by providing graphical visualization of circuit operation and current flow. Users can observe state changes in real-time, which aids in grasping circuit functionality and identifying potential faults.

Can I create complex circuits with LoCAD?

Yes, LoCAD allows for the creation of custom integrated circuits (ICs) with nested levels. This feature enables the construction of large and intricate circuits in an organized manner, with state changes visible within all ICs during simulation.

What devices is LoCAD compatible with?

LoCAD is available for Mac and iPad devices. Its subtitle specifically mentions its functionality on the iPad, suggesting a strong focus on that platform.

How much does LoCAD cost?

LoCAD is a paid application, priced at $1.99. This one-time purchase grants access to the full functionality of the software.

Is LoCAD suitable for beginners?

Yes, LoCAD includes a detailed introduction to help users familiarize themselves with the software. The emphasis on simple creation and graphical visualization also makes it accessible for those new to circuit design.

Does LoCAD have ads?

No, LoCAD does not contain advertisements. As a paid application, it offers an uninterrupted user experience without any ad interruptions.

How often is LoCAD updated?

The latest version of LoCAD is 9.3, last updated on February 21, 2026. This indicates a recent update, suggesting ongoing development and support for the application.