A professional-grade, cross-platform digital logic circuit simulator.
Design, simulate, and package custom Integrated Circuits with ease.
Logik is a robust simulation environment designed for students, hobbyists, and engineers, bridging the gap between theory and real-world digital design.
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Comprehensive Component Library:
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Basic Logic: AND, OR, NOT, XOR, NAND, NOR, Buffer.
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Sequential Logic: D Flip-Flop, T Flip-Flop, JK Flip-Flop, Clock generators.
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I/O Peripherals: Switches, Output Probes (LEDs), 7-Segment Displays, Hex Displays.
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Annotation: Text labels to document your circuit designs.
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Dynamic Gate Configuration: Need a 4-input AND gate? Simply right-click a gate or use the context menu to add extra input pins dynamically. No need to cascade multiple 2-input gates.
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Advanced Simulation Engine: Real-time, event-driven simulation with adjustable clock speeds (0.5Hz to 50Hz) and variable logic propagation speeds.
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Timing Diagrams & Logic Analysis: Visualise signal states over time. This tool allows you to debug race conditions and understand the timing relationships between different parts of your circuit.
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Gate Propagation Delay: Enable "Propogation Delay" to simulate real-world propagation delay. Gates take a small amount of time to change state, allowing you to identify and study hazards and glitches that instant-logic simulators miss. Each gate can have its own custom delay set
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Auto-Layout: Messy wires? Use the Auto-Organise tool (
Tools->Auto-Organise) to instantly untangle your circuit. The algorithm intelligently repositions components and routes wires for maximum readability. -
Custom Integrated Circuits (ICs): Package complex circuits into reusable "Black Box" chips to build high-level architectures. Supports nesting (chips inside chips).
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Modern User Experience: Smooth panning, zooming, snap-to-grid placement, and multi-selection support.
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State Persistence: Automatically saves your window state, layout preferences, and last-used theme between sessions.
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Cross-Platform: Native installers for Windows and Linux.
Logik features a powerful theming engine that lets you customise every aspect of the UI, from the background grid to the color of a "High" wire signal.
Logik ships with several pre-designed themes, including Dracula, Nord, Solarized, and Monokai.
I highly recommend trying the One Dark theme for the best balance of contrast and eye comfort during long sessions.
You can create a custom theme by adding a .properties file to your ~/.logik/themes/ directory.
1. Create a file: e.g., MyNeonTheme.properties
2. Define your colors: (Use Hex codes)
# Backgrounds
background=#0f0f1a
grid.major=#2a2a40
grid.minor=#1a1a2e
# Components
component.fill=#1e1e2e
component.border=#bbbbbb
component.pin=#ffffff
# Wires
wire.off=#444455
wire.on=#00ff99 <-- Your custom "High" signal color
wire.selected=#ffcc00
# UI Elements
ui.text=#ffffff
ui.button.bg=#333344
ui.button.hover=#444455
(For a full list of attributes refer to one of the builtin themes)
3. Load it: Restart Logik, and your new theme will appear in the View -> Theme menu.
The easiest way to get started on Windows.
- Download the
.msiinstaller from the Releases Page. - Double-click to install.
- Launch "Logik Simulator" from your Desktop or Start Menu.
- Note: Windows may show a "Protected your PC" warning. Click More Info -> Run Anyway (this appears because the app is open-source and not digitally signed).
Install via terminal with a single command. This handles downloading, extracting, and creating desktop shortcuts automatically.
curl -sL https://raw.githubusercontent.com/JamieLittle16/LogiK/main/src/main/install.sh | bash
To uninstall, simply run:
curl -sL https://raw.githubusercontent.com/JamieLittle16/LogiK/main/src/main/uninstall.sh | bash
Once installed, run logik from your terminal or launch it from your Applications menu.
For macOS users or those who prefer zero installation:
- Ensure you have Java 17 or higher installed.
- Download
logik-1.3.1-all.jarfrom the Releases Page. - Run via terminal:
java -jar logik-1.3.1-all.jar
If you wish to modify the code or compile it yourself:
# Clone the repository
git clone https://github.com/JamieLittle16/LogiK.git
# Build the Standalone JAR
./gradlew clean jar
The output file will be located in build/libs/.
Logik is designed for speed and efficiency using industry-standard shortcuts.
| Action | Mouse | Keyboard |
|---|---|---|
| Pan View | Middle Click Drag | Alt + Left Click Drag |
| Zoom In/Out | Mouse Wheel | Ctrl + + / - |
| Reset Zoom | Ctrl + 0 |
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| Fullscreen | F11 |
| Action | Mouse | Keyboard |
|---|---|---|
| Select | Left Click / Drag Box | |
| Multi-Select | Shift + Left Click |
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| Move Selection (Grid) | Drag Selection | Arrow Keys |
| Move Selection (Fine) | Shift + Arrow Keys |
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| Place Component | Left Click (from Palette) | |
| Keep Placing | Ctrl + Left Click |
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| Rotate (90°) | R (while placing or selecting) |
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| Rotate (180°) | Ctrl + R |
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| Delete | Delete or Backspace |
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| Undo | Ctrl + Z |
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| Redo | Ctrl + Y |
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| Cut | Ctrl + X |
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| Copy | Ctrl + C |
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| Paste | Ctrl + V |
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| Rename / Edit Text | Double Left Click | |
| Context Menu | Right Click | |
| Auto-Layout | Ctrl + L |
| Action | Input |
|---|---|
| Toggle Switch | Left Click on Switch |
| Manual Step (Tick) | T |
| Pause Simulation | Space |
Logik allows you to abstract complex logic into single reusable blocks.
- Design a circuit you want to reuse (e.g., a Full Adder).
- Place Switches for inputs and Output Lights for outputs.
- Note: The vertical order (Top-to-Bottom) of your switches/lights determines the pin order on the final chip.
- Select the entire circuit using the selection box.
- Right-Click and select
Create Custom IC. - Enter a name (max 5 chars recommended).
- The new chip will appear in your Palette under "Custom IC". You can now place simulated copies of your circuit instantly.
We are constantly improving Logik. Here are current limitations to be aware of:
- Undo/Redo History: The undo stack is currently limited to 50 steps and may not perfectly track changes made inside a custom component definition after it has been created.
- Circular Dependencies: Creating a custom IC that contains itself (recursion) will crash the simulation - UI makes this impossible.
- Printing: Direct printing support is not implemented; use OS screenshots for now.
- Truth Tables/Kmap Some views to aid with logic simplification - hopefully eventually a button that runs Quine McCluskey to produce the simplified logic
If you find any other bugs (or requested features) please open an issue - (or better yet a pull request!)
This project is licensed under the GNU General Public License v3.0 (GPLv3).
You are free to run, study, share, and modify the software. See LICENSE for details.