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Free Online Circuit Simulator in the Browser

Real SPICE analog simulation, schematic capture and an oscilloscope, plus firmware that actually runs on the board. No download, no license, no Windows required.

Try it free
Tinkered schematic editor running a live simulation of an Arduino Uno traffic light controller, with a passing ERC check, an Arduino Uno symbol and full pinout, three 220 ohm resistors driving red, yellow and green LEDs with the yellow one lit, current flowing along the labelled nets, live node voltages, a symbol library of sources, passives and diodes, and an assistant panel listing the generated project files and the checks that passed

Multisim Live retires on September 15, 2026. You are in the right place.

Get to a first circuit without giving up control.

Start with the behavior, parts, interfaces, or constraints that matter. Tinkered uses AI to create an editable schematic while every symbol, value, net, and pin remains open to review.

  1. 01

    Define what the circuit must do

    Describe the behavior, components, interfaces, power requirements, or constraints that already matter.

  2. 02

    Review the first schematic

    Inspect the selected parts, electrical values, power rails, buses, nets, and MCU pin assignments.

  3. 03

    Change any decision

    Replace a part, reconnect a net, adjust a value, or choose a different pin without starting the design over.

An editor that behaves like one.

Generation is a starting point, not a contract. The schematic underneath is a proper engineering document you can drive by hand at any moment.

  • Draw it yourself

    Place parts from a library of thousands of symbols, route multi-segment wires with the corners you choose, and label nets instead of dragging a wire across the sheet.

  • Nothing is locked

    Every symbol, value, net, and pin the assistant proposes stays editable. Change a part, reroute a connection, or start from an empty sheet and never use the assistant at all.

  • Real designators and values

    Reference designators, component values, and pin assignments are structured data, not labels drawn on a picture. They carry into the netlist and into firmware.

See the code and the circuit on one timeline.

Most tools make you choose. Run the firmware and guess at the analog, or simulate the analog with no firmware in it. Tinkered runs both together and measures them against a single clock, so you can watch a pin change state and watch what that did to your circuit in the same moment.

  • Firmware

    Your compiled code, running

    The sketch that will ship runs against the circuit you drew. Pin writes, timers, and interrupts happen when the firmware says they happen.

  • Analog

    Real component behavior

    Capacitors charge, op-amps settle, and dividers load exactly as their values dictate. Not animated approximations of a circuit.

  • One timeline

    Cause next to effect

    Both are measured against the same clock, so a pin edge and the analog transient it caused appear on the same trace, at the same instant.

Measure it before you build it.

A schematic that only looks right is a guess. Tinkered gives the design a bench: probes on any net, a triggering oscilloscope, the analyses you already work in, and measurements that agree with what an instrument on your desk would tell you.

  • Oscilloscope

    Probe any net or pin. Edge triggering with adjustable level, slope, hold-off, and pre-trigger position. Auto, normal, and single-shot capture, so a one-time event stays on screen.

  • Automatic measurements

    Vpp, Vrms, Vavg, top and base, frequency, period, duty cycle, rise and fall time, and overshoot. Levels come from the settled waveform, not from peaks, so a ringing edge reports honest numbers.

  • Analysis modes

    Operating point for a quick DC answer, transient for behavior over time, DC sweep for a curve across an input, and AC sweep for frequency response across decades.

  • Math and spectrum

    Derive current across a shunt or instantaneous power from two probes. Take an FFT of any channel with selectable windowing when you need the frequency picture instead of the time one.

  • Protocol decode

    Read UART, I2C, and SPI traffic decoded from the captured lines, so a bus problem is legible as frames instead of a wall of edges.

  • Design checks and export

    Rule checks flag floating inputs, conflicting drivers, and power problems before you order parts. Export any capture as CSV when the analysis continues somewhere else.

Every capture is inspectable. Open the generated netlist and read exactly what was solved, line by line.

From schematic to a device that runs.

Tinkered keeps the circuit from becoming an isolated drawing. For MCU projects, components, connections, and pin assignments continue into firmware, simulation, and physical hardware.

  1. 01

    Create

    Turn requirements into an editable circuit with components, values, nets, and power connections.

  2. 02

    Validate

    Review electrical conditions, missing connections, and unresolved requirements before moving on.

  3. 03

    Connect firmware

    Carry MCU interfaces and pin assignments into the board-specific code that controls the circuit.

  4. 04

    Simulate

    Run the firmware with the circuit and observe how inputs, outputs, and components respond together.

  5. 05

    Build

    Take the reviewed project toward assembly, deployment, and another physical iteration.

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 zoom
    Arduino · Renesas RA4M1

    Arduino UNO R4 WiFi

  • 3D modelDrag to rotate · Scroll to zoom
    ESP32-S3 · Wi-Fi + Bluetooth

    Arduino Nano ESP32

  • 3D modelDrag to rotate · Scroll to zoom
    RP2350 · Arm + RISC-V

    Raspberry Pi Pico 2

  • 3D modelDrag to rotate · Scroll to zoom
    ESP32-S3 · Compact wireless

    XIAO ESP32S3

  • 3D modelDrag to rotate · Scroll to zoom
    Matter · Thread + Bluetooth

    Arduino Nano Matter

  • 3D modelDrag to rotate · Scroll to zoom
    Learning · 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

Multisim Live goes offline on September 15, 2026, and the official replacement is paid Windows software. Tinkered runs on the Chromebooks and lab machines you already have, students share work with a link, and it is free.

Hobbyists & Makers

Multisim Live stopped at the circuit. Tinkered runs the firmware too, then flashes it to your Arduino or ESP32, so the project you simulated is the project sitting on your bench.

Engineers

Keep the SPICE analyses, the probes and the scope. Add mixed-signal simulation where the code and the analog circuit are solved together, and skip the license server entirely.

Common questions. Straight answers.

Still tinkering? Bring your build to the community.

Join the community
Is Multisim Live shutting down?

Yes. NI and Digilent have announced that Multisim Live reaches end of life on September 15, 2026. Monthly subscriptions ended on August 1, 2026, and yearly subscriptions are no longer sold or renewed. The official replacement is Multisim Desktop, which is paid software that runs on Windows only.

What happens to my Multisim Live circuits?

Export them before September 15, 2026. NI's path is to import them into Multisim Desktop, and NI's own documentation notes that the transfer is not complete: slider values, text annotations, simulation settings, simulator settings and component parameters do not carry over. If you would rather rebuild in a browser tool that is not going away, Tinkered is free to start and takes about a minute to sign up.

What is the best free Multisim Live alternative?

It depends on what you used Multisim Live for. If you want the browser part, real SPICE analog simulation, schematic capture, probes and an oscilloscope with cursors and automatic measurements, Tinkered covers that and is free. It also runs microcontroller firmware and flashes real boards, which Multisim Live never did.

Do I need to install anything?

No. Tinkered runs in the browser on macOS, Windows, Linux and ChromeOS. There is nothing to download, no license server and no IT approval to wait on, which is the main reason people picked Multisim Live over Multisim Desktop in the first place.

Does Tinkered run real SPICE simulation?

Yes. Analog components are solved with a real SPICE engine, not an animation. You get transient analysis, DC sweep and AC sweep, live node voltages and net currents on the schematic, probes you can place on any node, and an oscilloscope with cursors and automatic measurements.

Can I simulate microcontroller code, not just the circuit?

Yes, and this is the part Multisim Live never had. Tinkered runs your actual firmware cycle by cycle against the real instruction set, alongside the analog simulation, so the code and the circuit are solved together. Arduino, ESP32 and more than 1,300 boards are supported.

Is Tinkered free?

Yes. Tinkered is free to use. No credit card, no install, no catch.

Can I use Tinkered with my class?

Yes. It runs on school Chromebooks and lab machines with no installation, students share a circuit with a link, and the whole class works from the same browser tab they already have open. That matters this term, because Multisim Live goes offline on September 15, 2026, in the first weeks of the semester.

Keep building in the browser.

Try it free

Multisim Live (multisim.com) is the free browser-based circuit simulator from National Instruments, managed by Digilent, used by students, educators and engineers to capture schematics and run SPICE simulation online without installing anything. Also searched as “multisim live”, “multisim online”, “ni multisim”, “multisim free”, “multisim live alternative” and “multism”, it became a standard way to teach and share circuits in the browser. On September 15, 2026 it reaches end of life and goes offline. Monthly subscriptions ended on August 1, 2026, and the official path forward is Multisim Desktop, which is paid software for Windows.

Tinkered is a free online circuit simulator for the people that leaves behind. It keeps the reasons you chose a browser tool, nothing to download, nothing to license, works on macOS, Windows, Linux and ChromeOS, and it keeps the work you actually did in Multisim Live: schematic capture with net labels and rule checking, real SPICE analog simulation with transient, DC sweep and AC sweep, probes on any node, live voltages and currents, and an oscilloscope with cursors and automatic measurements. It adds what Multisim Live never had, running your microcontroller firmware alongside the analog circuit and flashing that firmware to a real Arduino, ESP32 or any of 1,300+ boards. If you are looking for a Multisim Live replacement before September 15, you can start in the browser tab you already have open.