The most enjoyable and realistic Digital logic gates circuits simulator.

DigicalSim (formerly: iLogicDesigner) is a full featured app which assists students in logic design, digital engineering, computer science and mathematics.
The app based on basic digital building blocks, logic gates. No knowledge of logic gates or digital circuits is required.
It offers the basic building blocks, wiring tools and a flexible plane to create live real-time digital circuits, ideal for anyone who wants to learn the basic principles of how computers work - especially students of digital engineering, learn how to create simple logic gates, latches, flip-flops, adders, shift registers and counters. it can help them perform complete lab experiments.

► Features:
- AND, NAND, OR, NOR, XOR, XNOR, Buffer, NOT, j-k Flip-Flop, D Flip-Flop, T Flip-Flop, Switch, Clock, Vcc, GND, VLink-Out, VLink-In, LED, 7-Segment Display, LED Stack Bar, and Label.
- Flood gates (3 & 4) inputs for the gates (AND, NAND, OR, NOR, XOR, XNOR).
- Multi-Color smooth curved wires.
- Ability to add Virtual Links for tidy circuits.
- Unlimited scrollable plane space, for extra large projects.
- Run mode for clean circuit look, while operating live.
- Circuit Lock, for safe Run.
- Two switch operation modes (Toggle or Pulse).
- Switchable synchronized digital waveform clock generators. with adjustable frequency.
- Switches can be linked to work exclusively together.
- Both Positive edge & Negative edge triggering supported for flip-flops, with indicator.
- Configurable LED light color.
- Live value indicators at each leg, for easy analysis.
- Customizable tag for elements.
- Customizable labels can be added anywhere.
- Design-Time snap grid for easier alignment and cleaner look.
- Zoom in & out, Also can be automatically zoomed to Show Circuit extents.
- Persistent Circuit, it saves current circuit automatically to be completed later.
- Save and load circuits using file manager.
- A library of ready made circuit examples for quick jump start.
- Circuits Can be shared and printed.
- Re-assignable circuit diagram origin.
- Append another circuit to the current circuit.
- Highlight the gate wirings while dragged.
- Select, deselect, duplicate, move & delete gates in groups.
- Groups of elements can have distinctive Color and Label with customizable font and font color.
- Auto scroll the plane when reach the edged while wiring, dragging or selecting.
- Elastic selection rectangle to easily select elements.
- Undo functionality, with 10 steps backward.
- Direct wiring to use with Apple Pen.
- Support to Pick'n Drop.
- Boolean function viewer for each Gates & LED, while in run mode.
- Live Timeline Viewer.

What’s New

Version 4.5

- Added Tri-State Buffer with pull-up & pull-down.
- Added Tri-State NOT Gate with pull-up & pull-down.
- Added Buzzer with independent serial.
- Added independent serial for LEDs.
- Added Hex Digit Display (it was BCD).
- Added optional Clock input for the J-K Flip-Flop.
- Added optional Clear input for both the D and T Flip-Flops.
- Added more Example libraries.
- More Organized menus.
- Some UI Tweaks.
- Updated App Icon.
- Updated App Info.
- iOS 13 Compatibility.
- Some fixed bugs.

Ratings and Reviews

2.9 out of 5
24 Ratings

24 Ratings

TotallyNotKaren ,

Good, yet expensive

It’s a nice app, and I got used to it fairly quickly, yet it’s $8.00 for the full thing. I will consider buying it later as it is late at night, but other than that, keep up the good work!

Blaze624 ,

Great idea, needs some work

The app idea is great and I wouldn’t mind paying a few dollars for it, however there is some work that needs to be done. The app itself is very laggy, and the controls seem unintuitive. Just slight things like this need to be done. Maybe a grid lock feature where the whole diagram doesn’t fly around when you tap it by accident? Or possibly just two fingers to move the whole thing. Quick animations will make the whole app seem quicker such as clicking where the gates are or the wiring. Overall though, this is the only app of its kind and has a very niche audience. However, the app has a strong foundation and I look forward to future updates and optimizations.

Developer Response ,

Please check latest update, and review. btw: the lock is in the lower left corner of the plane.

Loafofbread314 ,

Great App!

Overall I was really impressed with this app. Some of the controls a little funky to get used to, but it’s definitely worth it to see the logic gate circuits actually working. The best part was seeing the clock timeline and how it all looked together.

App Privacy

The developer, Amran AlQasmi, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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