The simulation layer for hardware teams

Test it in the twin.
Ship it in confidence.

Hardware is expensive to build, slow to debug, and brutal to iterate on. SimTwinOS gives embedded systems teams a virtual twin of their hardware — so you catch the bug on the screen, not the bench.

// Your embedded system, simulated
twin = SimTwin.create({
  platform: "STM32F4",
  clock: 168e6,
  pins: [PA5, PA6, PA7, PB0],
  peripherals: [SPI1, I2C1, UART2]
});

twin.run("gpio-interrupt-test.bin")
  .then(() => twin.logTimeline());
▶ Simulating STM32F4 @ 168 MHz
▶ Loading gpio-interrupt-test.bin
✓ Pin PA5 toggled correctly
✓ SPI1 transfer complete (12.4 μs)
! I2C1 NACK at address 0x3A — check pull-ups
MCU
SENSOR
Signal
How it works

From spec to simulation in minutes, not days

01

Define your hardware

Describe your microcontroller, pins, peripherals, and clock configuration. The twin is parameterized — no wiring diagrams to draw.

02

Load your firmware

Drop in a .bin or .elf file. SimTwinOS simulates execution cycle-accurately, catching timing issues, peripheral mismatches, and logic errors.

03

Simulate and instrument

Run test suites, inspect registers, trace pin state changes, measure execution time. Get cycle-accurate waveforms without an oscilloscope.

04

Deploy with certainty

When the twin passes, flash the real hardware. The firmware you tested is the firmware that ships.

Platforms

Every chip your team builds on

SimTwinOS supports the microcontrollers and embedded platforms your team actually uses — not a curated list of demo boards.

ARM Cortex-M

  • STM32 F0/F1/F2/F3/F4/F7
  • NXP LPC, Kinetis, i.MX RT
  • Nordic nRF52, nRF91
  • TI Tiva, MSP430

MCUs & SoCs

  • Espressif ESP32 / ESP32-S3
  • Raspberry Pi RP2040
  • Arduino (AVR, ARM)
  • Renesas RA, RX

Peripherals & Protocols

  • SPI / I2C / UART / I2S
  • PWM, ADC, DAC, DMA
  • CAN, LIN, RS485
  • USB HID, CDC, MSC

RTOS & Frameworks

  • FreeRTOS
  • Zephyr RTOS
  • Arduino Framework
  • Bare-metal C / C++

Don't see your platform? Native Python / C / Julia API lets you define custom targets — any chip, any protocol.

"We caught a timing bug that would have cost us three board respins. The twin found it in 40 minutes. Three respins would have been eight weeks and $40,000."

— Hardware team lead, robotics startup

Every hardware team deserves a twin.

Whether you're a two-person embedded shop shipping a sensor product, or a hardware startup building the next generation of machines — simulation is how you move fast without breaking things. SimTwinOS is built for the teams who are serious about shipping hardware right the first time.