Cycle-accurate AVR emulation
Every clock cycle of your firmware runs against the real ATmega instruction set. Same timing, same interrupts, same edge cases. Exactly the way the physical chip executes it.
3D Circuit Simulator in the Browser
Tinkered runs your actual firmware on a virtual board with real electrical physics. Components behave exactly as they will on your desk.
Previously using Withdiode (withdiode.com)? You’re in the right place.
From idea to working hardware.
- 01
Describe
Type your project in plain English. Tinkered reads it and figures out the components, pin assignments, and behavior you actually need.
- 02
Wire
Get a complete circuit and firmware generated for you, or wire it manually in the 3D editor if you'd rather. Either way, components snap together with real connectors.
- 03
Simulate
Run your firmware on the virtual board with real electrical physics. Catch shorts, voltage mismatches, and bad timing in the browser before you touch a soldering iron.
- 04
Deploy
One click flashes to Arduino, ESP32, Raspberry Pi Pico, or any of 1,300+ supported boards. Same firmware, real hardware, no driver hunting.
See Tinkered in motion.
Real simulation. Real physics. Real results.
SPICE Analog Physics
Real analog simulation, not just visual. Resistors, capacitors, transistors, and op-amps behave like actual components. Voltage drops, current flow, and signal integrity all modeled at the circuit level.
AI Circuit Generation
Describe your project in plain English and Tinkered builds the wiring, picks the components, and writes the firmware. Iterate by chatting, not by re-drawing schematics.
Component Library
Microcontrollers, LEDs, 555 timers, transistors, resistors, capacitors, displays, sensors, motors, and more. Everything you need to prototype any idea.
1,300+ boards, ready when you are.
Generate, validate, compile, and deploy firmware for the boards makers use every day, from Arduino and ESP32 to Raspberry Pi Pico, STM32, Teensy, micro:bit, and more.
See all supported boards- 3D modelDrag to rotate · Scroll to zoomArduino · Renesas RA4M1
Arduino UNO R4 WiFi
- 3D modelDrag to rotate · Scroll to zoomESP32-S3 · Wi-Fi + Bluetooth
Arduino Nano ESP32
- 3D modelDrag to rotate · Scroll to zoomRP2350 · Arm + RISC-V
Raspberry Pi Pico 2
- 3D modelDrag to rotate · Scroll to zoomESP32-S3 · Compact wireless
XIAO ESP32S3
- 3D modelDrag to rotate · Scroll to zoomMatter · Thread + Bluetooth
Arduino Nano Matter
- 3D modelDrag to rotate · Scroll to zoomLearning · Sensors + display
BBC micro:bit
Also supported
- Arduino Uno
- Arduino Nano
- Arduino Mega
- ESP32
- ESP8266
- Raspberry Pi Pico
- RP2040
- STM32 Nucleo
- Teensy
- BBC micro:bit
- Nordic nRF52
- Feather boards
Built for everyone who builds.
Students & Educators
No lab budget? No problem. Simulate circuits for class, share projects with a link, and learn electronics without buying a single component.
Hobbyists & Makers
Test your idea before buying parts. See it work in 3D simulation before you solder a wire.
Engineers
Cycle-accurate AVR emulation plus SPICE analog physics. Real simulation depth, zero setup.
Common questions. Straight answers.
Still tinkering? Bring your build to the community.
Join the communityWhat is the best diode simulator in the browser?
Tinkered is the most capable free diode and circuit simulator that runs in the browser. No download, no install, real SPICE analog physics, Arduino and ESP32 support.
What happened to Withdiode?
Withdiode (withdiode.com) went viral on Hacker News in April 2026 then went offline. The site is currently unavailable. Tinkered is the most capable browser-based alternative: everything Withdiode did, plus AI circuit generation, SPICE simulation, and hardware deployment.
Is there a free alternative to Withdiode?
Yes. Tinkered is free to join. Like Withdiode, it runs entirely in the browser with no download or installation required.
Does Tinkered have the same 3D simulator as Withdiode?
Yes. Tinkered features a full 3D breadboard simulator in the browser, the same visual approach Withdiode pioneered, built on more accurate physics.
Can I simulate Arduino in the browser like Withdiode?
Yes. Tinkered supports Arduino simulation with cycle-accurate AVR emulation, the same underlying approach Withdiode used. It also supports ESP32 and more boards Withdiode never had.
Is Tinkered free like Withdiode was?
Yes. Tinkered is free. No credit card, no install, no catch.
Does Tinkered simulate component failures like Withdiode did?
Yes, including the magic smoke when you short the battery. Tinkered runs SPICE-level physics so component behavior, including failure modes, is physically accurate.
What is the Diode website?
The Diode website (withdiode.com) was a free browser-based 3D circuit simulator that let you build, program, and simulate hardware directly in the browser. Tinkered is the free working alternative: same 3D simulation, no download required.
Build something real.
Turn a sentence into a validated electronics prototype—with the circuit, firmware, schematic, 3D simulation, and deployment working together.
Withdiode (also searched as “withdiode.com”, “www.withdiode.com”, “withdiode com”, “withdiode .com”, “withdiode. com”, “with diode com”, “with diode”, “www.withdiode”, “diode com”, “diode”, “diode website”, “diode website simulator”, “diode build”, “diode build program”, “diode simulator”, and “whitdiode”) was a free browser-based 3D hardware simulator that let students, hobbyists, and engineers build, program, and simulate circuits directly in the browser with no download or installation required. It supported Arduino Uno simulation, 555 timers, transistors, LEDs, resistors, capacitors, and more. Thousands of people searching for a free online circuit simulator, electronics simulator, or 3D hardware simulator in the browser are now looking for a working alternative.
Tinkered is the natural next step. Like Withdiode, it runs entirely in the browser with no download or installation required and supports Arduino simulation with cycle-accurate AVR emulation. Unlike Withdiode, Tinkered adds AI that generates your complete circuit and firmware from a plain English description, SPICE analog physics for real component behavior, ESP32 support, and a direct path from simulation to physical hardware deployment. If you used Withdiode to prototype circuits before building them, Tinkered does the same and takes it all the way to your real board.