Early access · waitlist open
Write firmware before the board exists.
CircuitTwin turns your schematic into a working simulation of your board. Boot your unmodified firmware and find the bring-up bugs before the hardware exists.
Schematic in. Running firmware out.
Three steps between a PDF and a booting board.
Import your schematic
Bring in a board and its parts. Pin assignments, buses and peripherals come across with it.
Get a working twin
The board becomes a simulation with real register maps behind every peripheral, not a stub that returns zeroes.
Run your firmware, unmodified
The same binary you would flash boots against the twin. No test harness, no #ifdefs, no porting layer.
What the twin models
Every twin is scoped to what it actually verifies, so you know which of its answers to trust.
Register-level behavior of the MCU and its peripherals
Bus and interrupt semantics, including the timing-sensitive handshakes firmware depends on
Sensor and IC breakout twins that speak the same register-level protocol as the real part
Boots and runs unmodified vendor firmware exactly as it runs on hardware
Stop waiting on hardware.
For firmware and hardware engineers who are waiting on a board spin, sharing one dev kit across a team, or keeping a driver working across three revisions of a design. If you have ever written code you could not run for two weeks, this is for you.