Source: https://mokxi.com/learn/best-logic-gate-simulator Updated: 2026-11-03 Learn # The best logic gate simulator for your class or project Beginner Written by the Mokxi team, updated November 3, 2026 Start building free Open the editor Or see every lesson. - 505 parts on the bench - 45 boards running now - 1.00x real time, on every board Press Run, then hold the buttons Two buttons drive an AND, an XOR and a NOT, so the truth table lights up as you press. The best free logic gate simulators are CircuitVerse and Mokxi in the browser, and Logisim-evolution and Digital on the desktop. CircuitVerse is built for logic alone, with assignments and LMS links. Logisim-evolution and Digital work offline and reach FPGAs and HDL. Mokxi adds real 74HC chips on a breadboard, analog parts and microcontrollers, and a path from one NAND gate to a working computer. We make Mokxi, so we have a stake. Every claim about another tool comes from the sources at the bottom, each with the date we last checked it. The circuit above is two buttons into an AND, an XOR and a NOT, with an LED on each output: hold both buttons and only the AND lights. ## What to check before picking one Four questions settle most choices. Does it have to run in a browser, because the class is on Chromebooks, or can it be installed? Is the course logic only, or does it go on to analog parts and microcontrollers? Does the teacher need assignments and grading built in, or through an LMS? And is the course heading toward HDL and FPGAs, which only some of these tools support? A second question is ideal gates or real chips. Ideal gates are the fastest way to a truth table, and every tool here has them. Real 74HC chips add what a breadboard lab has: supply pins that must be wired, outputs that float when a chip is unpowered, and propagation delays. A course that ends at a lab bench benefits from practicing with the chips it will meet there. ## CircuitVerse Free, open source and in the browser, built for digital logic: subcircuits, multi-bit buses, timing diagrams, testbenches and circuits generated from a truth table. Teachers get groups and assignments with deadlines and grading, and assignments connect to Canvas or Moodle through LTI. For a logic-only class that wants a free browser tool, it is a strong first choice. ## Logisim-evolution Free and open source under the GPL-3.0, a desktop program for Windows, macOS and Linux that works offline. It has subcircuits, a chronogram of signals over time, a TTL chip library, components described in VHDL, and it can take a design onto an FPGA board. Version 5.0.0 came out in September 2026. It needs an install, which a school Chromebook may not allow. ## Digital Helmut Neemann’s Digital is free and open source, a Java desktop program inspired by the original Logisim. Test cases are stored with the circuit, it derives truth tables and expressions from a circuit, and it exports to FPGA boards with VHDL and Verilog. The pick for a course heading toward HDL. ## Mokxi Free in the browser, with ideal gates for truth tables and real 74HC chips, the 74HC00, 08, 32, 86, 74 and more, that need their supply pins wired and have datasheet delays. A logic path packages any circuit as a chip, checks it against its truth table row by row, and builds up through an adder and memory to a small CPU running a program. Analog parts and microcontrollers sit on the same canvas. It has no HDL, no FPGA export and no chronogram, and it is not open source. ## Which one for which course A high school digital electronics class on Chromebooks: CircuitVerse or Mokxi, both in the browser. CircuitVerse if the course is logic alone and assignments go through Canvas or Moodle; Mokxi if the course moves on to breadboard chips, a 555, sensors or an Arduino, or the teacher wants checks that run on each submission and a gradebook export. A college computer architecture or digital design course: Logisim-evolution or Digital, which reach VHDL, Verilog and FPGA boards, on lab machines that allow an install. Mokxi’s path from one NAND gate to a small CPU suits the first weeks of such a course, or a course that builds a computer without an HDL. A self-taught learner on any machine: start in the browser with whichever tool’s first circuit makes sense to you, and move when a course or a project asks for something it lacks. Your truth tables carry over between all of them. ## From gates to a computer Logic courses often end by building something that computes. In Mokxi that is a guided path: a NAND gate, then NOT, AND and OR built from it, then an adder, then memory, each packaged as a chip of your own once it passes its truth-table check, up to a small CPU that runs a program from ROM. Logisim-evolution and Digital let you build the same thing freely with subcircuits, without the guided checks. ## Falstad, for logic beside analog Falstad’s CircuitJS, free and in the browser, has logic gates and flip-flops beside its analog parts, with live animation. It suits a lesson that moves between the two, such as showing why a logic input left floating misbehaves or how a pull-up resistor sets a level, and it shares a circuit as a single link. It has no class tools and no HDL, and its main simulator does not run microcontroller code. Open this circuit in the editor. A gate lab: AND, XOR and NOT, wired as it runs at the top of this page. Change a part or a value and run it again. Open the circuit ## Questions What is the best free online logic gate simulator? CircuitVerse for a logic-only class with LMS assignments; Mokxi for logic with real chips, analog parts and a path to a CPU. Both are free in the browser. Which logic simulator works offline? Logisim-evolution and Digital are desktop programs that work offline. Falstad also has offline builds. Which logic simulator supports VHDL or an FPGA? Logisim-evolution (VHDL components, FPGA boards) and Digital (VHDL and Verilog, FPGA export). Mokxi and CircuitVerse do not. Which one works on a Chromebook? The browser tools: CircuitVerse, Mokxi and Falstad. Logisim-evolution and Digital need an install. Related ## Keep going Logic Gates, and the Truth Table You Can Press Build a Computer From NAND Gates, Step by Step Digital Logic Lab Experiments, Graded in the Browser Digital Electronics on Chromebooks: Labs by Unit Arduino Simulators Compared: An Honest Roundup The logic gate simulator Mokxi and CircuitVerse, compared Mokxi and Logisim-evolution, compared Mokxi and Digital, compared The project page, with the full sketch Beginner Sources ## Where the facts on this page come from - CircuitVerse: home page (checked September 29, 2026) - CircuitVerse: for teachers (checked September 29, 2026) - CircuitVerse blog: LMS integration through LTI (checked September 29, 2026) - Logisim-evolution on GitHub (checked September 29, 2026) - Logisim-evolution releases (checked September 29, 2026) - Digital on GitHub (checked September 29, 2026) - Falstad: circuit simulator (checked September 29, 2026) ## Build this for real Open the editor, change a value and watch the number move with it. Nothing to install, and no account needed. Start building free Open the editor