Fritzing alternative: learn digital logic in your browser
Fritzing is an open-source hardware initiative and a desktop application for makers, best known for its realistic breadboard view: you place an Arduino, a breadboard and parts the way they look on your desk, and the same design also appears as a schematic and a PCB layout that you can order through Fritzing Fab. It grew out of a research project at the Potsdam University of Applied Sciences, its source code is GPL v3 on GitHub, and version 1.0.8 came out on August 12, 2026 for Windows, macOS and Linux. The ready-built download costs EUR 8 (EUR 25 for business customers), which funds development, and its source includes a circuit simulator built on ngspice. If your goal is to understand digital logic, all the way up to how a CPU works, digiwleea is a free alternative in the browser.
What Fritzing is good at
Documenting and building real hardware. The breadboard view shows a project exactly as it is wired, which is why it is so popular among Arduino and Raspberry Pi users for sharing projects, and the same file carries on to a schematic and a manufacturable PCB. Its parts library has many commonly used high-level components. (digiwleea is an independent project, not affiliated with Fritzing or the Friends-of-Fritzing.)
How digiwleea is different
digiwleea is about the logic inside, not the board outside. It simulates digital circuits at the switch level (every wire is 0, 1 or floating), with no breadboard, analog parts or PCB. You build NOT and NAND from CMOS transistors, then adders, latches, registers, RAM and an 8-bit CPU that runs a stored program, plus the assembly language behind it, through a 40+ level course where every part is checked against its truth table, with an AI tutor (Wleea). It runs in any modern browser, including school Chromebooks, with nothing to install. For wiring an Arduino project or ordering a board, Fritzing is the better tool; for simulating a microcontroller in the browser, see our Wokwi comparison.
| Fritzing | digiwleea | |
|---|---|---|
| Runs on | Windows, macOS and Linux (desktop app) | Any modern browser, Chromebooks and phones included |
| Best at | Breadboard diagrams, schematics and PCBs for real projects | Learning digital logic from transistor to CPU |
| Simulation | ngspice-based circuit simulation | Switch-level digital logic: 0, 1 and floating |
| Learning path | Examples and community projects | A 40+ level course with an AI tutor |
| Price | EUR 8 download (EUR 25 for business); source code GPL v3 | Free lab and Act I; Premium for the full course |
No sign-up is needed to start: open the lab and place your first transistor, or read the free theory course. The account (and the AI tutor) are optional.
More comparisons: Electronics and SPICE simulators
See for yourself: build a logic gate from transistors in the simulator, then follow the path from sand to an 8-bit CPU.
Open the digiwleea lab →Frequently asked
Is there a Fritzing online version?
Fritzing is a desktop app for Windows, macOS and Linux. For digital logic in the browser, digiwleea needs no install; for microcontroller projects online, Wokwi and Tinkercad Circuits run in the browser.
Is Fritzing free?
Its source code is open (GPL v3 on GitHub), but the ready-built download on fritzing.org costs EUR 8, or EUR 25 for business customers, which funds its development.
Can Fritzing simulate circuits?
Fritzing's source includes a simulator built on ngspice, the open-source SPICE engine. digiwleea simulates digital logic in the browser, from single transistors up to a working CPU.
Is there an online alternative to Fritzing?
For digital logic, digiwleea runs in the browser with a free lab and first course act. For microcontroller projects in the browser, Wokwi simulates Arduino and ESP32 boards; for schematics and PCBs, EasyEDA works online.
Can I learn logic gates with Fritzing?
You can wire logic chips on its breadboard view. digiwleea is built for it: you build each gate from transistors and combine them into adders, memory and a CPU, with every step checked.