LogicEmu

LogicEmu is a logic circuit emulator that runs in the browser.

View demo running here: http://lodev.org/logicemu/

LogicEmu supports logic gates, switches, LEDs, flip-flops, combinational logic, sequential logic, integrated circuits, ROMs, displays, ... in an ASCII notation or rendered with HTML5.

For example this:

            "128"  "64"  "32"  "16"  "8"   "4"   "2"   "1"
              l     l     l     l     l     l     l     l
              ^     ^     ^     ^     ^     ^     ^     ^
 "carry"l<o<a e o<a e o<a e o<a e o<a e o<a e o<a e o<a e s"carry"
          ^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/
          a e . a e . a e . a e . a e . a e . a e . a e .
          ^^^   ^^^   ^^^   ^^^   ^^^   ^^^   ^^^   ^^^
          | |   | |   | |   | |   | |   | |   | |   | |
          | |   | |   | |   | |   | |   | |   | |   | |
          | ,---+-+---+-+---+-+---+-+---+-+---+-+---+-+-.
          | ,---. .---+-+---+-+---+-+---+-+---+-+---+-+-+-.
          | | .-------. .---+-+---+-+---+-+---+-+---+-+-+-+-.
          | | | .-----------. .---+-+---+-+---+-+---+-+-+-+-+-.
          | | | | .---------------. .---+-+---+-+---+-+-+-+-+-+-.
          | | | | | .-------------------. .---+-+---+-+-+-+-+-+-+-.
          | | | | | | .-----------------------. .---+-+-+-+-+-+-+-+-.
          | | | | | | | .---------------------------. .-+-+-+-+-+-+-+-.
          | | | | | | | |                               | | | | | | | |
          | | | | | | | |                               | | | | | | | |
          s s s s s s s s                               s s s s s s s s
     "a" "1 6 3 1 8 4 2 1"                         "b" "1 6 3 1 8 4 2 1"
         "2 4 2 6        "                             "2 4 2 6        "
         "8              "                             "8              "

Becomes this (and in the application it becomes interactive):

It comes with tons of built-in circuits to explore and allows creating your own.

Running offline

LogicEmu can run offline, because it is not cloud based. Everything is ran and stored locally.

To run it offline, download the following files from github: index.html, logicemu.js, footer.js, circuits_main.js, circuits_help.js. Then run index.html from disk in a browser (offline if you wish so).