Issie (Interactive Schematic Simulator with Integrated Editor) is an educational application for designing, testing and analysing digital electronic circuits.
Developed at Imperial College London, the software aims to make digital hardware design accessible to beginners while providing the functionality needed for substantial projects.
Issie combines graphical circuit editing with an emphasis on helping users identify and correct design problems. Its simulation facilities allow students to develop complex digital systems and understand how their internal signals behave over time.
This is free and open source software.
Key Features
- Graphical schematic editor for digital circuit design.
- Interactive step-by-step circuit simulation.
- Waveform simulator for analysing signal changes over time.
- Supports substantial simulations involving large numbers of clock cycles.
- Hierarchical circuit designs with reusable components.
- Truth table generation for combinational logic.
- Visual error highlighting with explanations of circuit problems.
- Facilities for inspecting internal signals during simulation.
- Supports complex digital systems including processor designs.
- Optimised simulation performance for large circuits.
- Project management with separate design sheets.
- Example projects demonstrating complete digital designs.
- Automatic project backups for design recovery.
- Cross-platform support – runs on Linux, macOS, and Windows.
Website: github.com/tomcl/issie
Support:
Developer: Tom Clarke and contributors
License: GNU General Public License v3.0
Issie is written in F#. Learn F# with our recommended free books and free tutorials.
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| CircuitJS1 | Offline desktop adaptation |
| OpenCircuits | Web-based digital circuit and logic designer |
| CircuitVerse | Construct digital logic circuits online |
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| CircuitSim | Real-time circuit simulator |
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