# Digital Gate Circuit Simulator — DigicalSim : Logic gates

> Digital circuit simulator for learning logic gates and digital engineering. (iPhone/iPad app by Amran AlQasmi.)

- Source: https://appshunter.io/ios/app/digital-gate-circuit-simulator/id1130192861 (this page in markdown: same URL + `.md`)
- Developer: [Amran AlQasmi](https://appshunter.io/developer/887076277)
- Category: Education, Utilities
- Price: $7.99
- Rating: 3.64/5 from 11 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 37 MB
- Languages: English
- Released: 2016-07-06
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/digital-gate-circuit-simulator/id1130192861/reviews.md

## What is Digital Gate Circuit 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 Hex Display, 8-LED Stack Bar, Buzzer, and Label.
- Flood gates (3 & 4) inputs for the gates (AND, NAND, OR, NOR, XOR, XNOR).
- Optional Tri-State pin for the gates (Buffer, NOT), with Pull-up & Pull-down.
- Optional Clock pin for J-K Flip-Flop.
- Optional Clear pin for D and T Flip-Flops.
- 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.

## Key features

- Logic gate simulation (AND, OR, NOT, etc.)
- Virtual linking and wiring tools
- Live circuit operation and analysis
- Save, load, and share circuit designs
- Circuit examples library
- Undo functionality

## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/digital-gate-circuit-simulator/id1130192861/reviews.md

### 3/5 — Good features but hangs frequently

*2024-10-19, version 4.5*

Very nice features, but why does it hang frequently on iphone 14?

Also, why does it assign auto label (like a, b, c) and adding custom label does not remove the original auto label?

Would give a five star with these two problem fixed.

### 1/5 — It got frozen

*2023-10-15*

It got frozen when I tried to save the current file. I cannot use apple pencil to draw the wire to connect gates so had to use fingers and due to the terminals are small so it hard to see if the wire get connected or not when the finger covers the terminal.

### 3/5 — Having a hard time to pick the correct input or output for wiring

*2021-02-07*

For some reason Whenever I want to wire a gate it only picks the output, even when I try to choose one of the inputs. 
It would be helpful if Apple Pencil can be used for wiring.

### 5/5 — GREAT APP

*2019-10-13*

it does what it needs to in a great way.

To build an advanced circuit, an ipad helps with the additional scene space and an apple pencil helps with the tiny buttons

it's really good for what it is

question for the developer: there is a "share" option. i finished a cool circuit and i wanted to see how to export it, and the app crashes vey time i click the "share" button... what are the designed export options?

thanks 

love the app

**Developer response:** Thanks for using the App, The Share option uses the standard iOS Share sheet, which let you pick the app you want to share the design with.. The main two choices is the Mail App, and the Files App...
However, I've tested the share option in the app, and it seems to work well. If this issue is still happen, then please send the details to the Support mail address.. and Include the device model name, iOS version, App version, and a screenshot of the error message...
thanks

### 5/5 — I like!

*2019-08-09*

I find this logic gates app enjoyable and helps with understanding!
However, my old iPhone 6+ gets warm while using it... not sure if this is something that can be fixed?

### 5/5 — Fantastic App

*2019-08-02*

This app is fantastic!  I use it to demonstrate and “play” with digital logic.  Much better than getting out the breadboard an my old TTL chips.  Well thought out and friendly interface.

### 5/5 — Super good for my learning of logic circuits,but theres a problem

*2018-06-30, version 4.2*

This application is one of the best I have ever found but the problem is, I can’t manage to rotate anyof the logic gates or stuff like that.Developer, if you’re reading this,please add a rotation option for this to be perfect :D

### 4/5 — Good

*2018-06-09, version 4.2*

I am a 2nd year electrical engineering student going to third year, this is a really helpful tool to learn about the basics of combinational and sequential logic. One thing though, how does the JK flip-flop in this app supposed to work? It doesn’t seems to have a clock input.

### 4/5 — JK Flip-Flop Doesn't work when J=K=1

*2018-06-02, version 4.2*

Drawing wire is too difficult - could have a pencil and draw from any point other than only from the ouput pin!

In addition, there is no clock input - though it has postive/negative clock selection.

One more, can’t wire feedback to self, or can't have multiple wires connected to the same node. Thus can't even make a Linear Feedback Shift Register with D-Flip-Flop!

Thanks for frequent updates. Please fix the uneven scales on timeline.

Good to see improvement and prompt bug fixing. Well done!

### 5/5 — Excellent

*2018-05-28, version 4.0*

A great product, convenient, multi platform, with ease of use, well thought out.....  Regularly updated.

## Frequently asked questions about Digital Gate Circuit Simulator

### What is Digital Gate Circuit Simulator used for?

Digital Gate Circuit Simulator is used to assist students in logic design, digital engineering, computer science, and mathematics by allowing them to create and simulate live, real-time digital circuits using logic gates.

### Does Digital Gate Circuit Simulator require prior knowledge of logic gates?

No, the app is based on basic digital building blocks and logic gates, and no prior knowledge of logic gates or digital circuits is required to use it effectively for learning.

### What types of logic gates and components are available in Digital Gate Circuit Simulator?

The app includes a wide range of components such as AND, NAND, OR, NOR, XOR, XNOR, Buffer, NOT gates, various Flip-Flops, Switches, Clocks, LEDs, and displays.

### Can I save and share my circuit designs with Digital Gate Circuit Simulator?

Yes, circuits can be saved and loaded using the file manager, and they can also be shared and printed, allowing for collaboration and documentation of designs.

### How does Digital Gate Circuit Simulator help with learning?

It provides a flexible plane to create live circuits, helping users learn basic principles of how computers work, perform lab experiments, and understand simple logic gates, latches, flip-flops, adders, and counters.

### What is the price of Digital Gate Circuit Simulator?

Digital Gate Circuit Simulator is a paid application priced at $7.99.

### On which devices can I use Digital Gate Circuit Simulator?

Digital Gate Circuit Simulator is supported on iPhone, iPad, and iPod devices.

### How often is Digital Gate Circuit Simulator updated?

The latest version, 4.5, was released on November 28, 2019, indicating that updates may not be very frequent.

## Version history (last 5 releases)

### 4.5 — 2019-11-28

- 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.

### 4.4 — 2019-01-10

- iOS 12.x Compatibility.
- iPhone X, Xs, Xs Plus, Xs Max, XR; Top notch compatibility.
- Minor UI Corrections.

### 4.3 — 2018-07-23

- Adjusting Some UI elements.
- Adjusting labels of some circuit components to be more adjacent to each others when in run mode.
- Correct some font sizes when printing.
- Other minor tweaks.

### 4.2 — 2018-05-31

- Hotfix Timeline when recursive wiring is used.
- Hotfix App Lockup when acquiring The Boolean Function Box if recursive wiring is used.

### 4.1 — 2018-05-30

- Fixing bug in which Links not appended with circuits that appended.
- Fixing bug in which Groups and Links not duplicated with gates.
- Fixing bug in which Serialization not worked properly for duplicated gates.
- Fixing bug in which Deletion of switches not deleting Links associated with it.

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All apps by Amran AlQasmi: https://appshunter.io/developer/887076277

## Related topics

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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 2026-07-04.*