Screen shot of Logisim 2.1.6, released May 7, 2007
Logisim 2.1.6 is now available.
Changes from previous releases.
(7 May 2007)
Logisim is an educational tool for designing and simulating digital
logic circuits. With its simple toolbar interface and simulation of
circuits as you build them, it is simple enough to facilitate learning
the most basic concepts related to logic circuits. With the capacity
to build larger circuits from smaller subcircuits, and to draw bundles
of wires with a single mouse drag, Logisim can be used (and is used)
to design and simulate entire CPUs for educational purposes.
Logisim is used by students at colleges and
universities around the world in many types of classes, ranging
from a brief unit on logic in general-education computer science
surveys, to computer organization courses, to full-semester courses on
- It is free! (Logisim is open-source (GPL).)
- It runs on any machine supporting Java 1.4 or later;
special versions are released for MacOS X and Windows. The
cross-platform nature is important for students who have a
variety of home/dorm computer systems.
- The drawing interface is based on an intuitive toolbar.
Color-coded wires aid in simulating and debugging a circuit.
- The wiring tool draws horizontal and vertical wires, automatically
connecting to components and to other wires. It's very easy to draw
- Completed circuits can be saved into a file, exported to a GIF file,
or printed on a printer.
- Circuit layouts can be used as "subcircuits" of other
circuits, allowing for hierarchical circuit design.
- Included circuit components include inputs and outputs, gates,
multiplexers, arithmetic circuits, flip-flops, and RAM memory.
- The included "combinational analysis" module allows for
conversion between circuits, truth tables, and Boolean
If you enjoy Logisim, you might also enjoy
and Lambda Calculator.