How accurate are the simulations?

HardLabs combines SPICE-grade behavioral models for analog blocks with cycle-aware digital models for buses and MCUs. They're tuned to expose integration and timing bugs — not to replace final sign-off characterization.

Which MCUs and peripherals are supported?

At launch we cover common Arm Cortex-M families and the I²C, SPI, UART, GPIO, timer, and interrupt subsystems firmware leans on most. Peripheral and sensor model coverage expands every release.

How is this different from plain SPICE?

SPICE simulates the circuit — it doesn't run your firmware. HardLabs executes your actual firmware image in the loop with the simulated circuit, so you test the hardware and the code together.

How is this different from a hardware-in-the-loop (HIL) rig?

A HIL rig needs physical hardware and bench instruments that don't exist until late in the program. HardLabs is a hardware-in-the-loop alternative that runs entirely in software, before any board is fabbed.

Do I need any physical hardware?

No. The whole point is to start before a prototype exists. When real hardware arrives, the same firmware and test suite carry straight over to the bench.

Yes. The loop runs headless, so you can gate every firmware commit on the same circuit-level tests you'd otherwise only run by hand at bring-up.

Can we run this on-prem or air-gapped?

Yes — talk to us. Self-hosted and on-prem deployment is available for export-controlled and IP-sensitive teams. Your netlists and firmware stay yours; we don't train on customer designs.

Which EDA tools do you support?

Cadence, Altium, and KiCad at launch — plus SPICE netlists and BOM/CSV imports. Allegro and Xpedition direct import is on the roadmap. Send us your netlist, schematic PDF, and BOM to get started.

What do I provide to get started?

Your netlist, schematic PDF, and BOM — plus your firmware (image or source). HardLabs builds the simulation and runs your code against it; you write no models.

Hardware–software co-simulation that sees the boundary

Agnieszka Szefer · Co-founder & CEOJuly 15, 2026Updated July 23, 2026

Prev. Stitch Fix · Amazon · Bain Capital Ventures. Built ML systems in production at scale; runs how we turn datasheets into models.

Co-simulation only helps if both sides are honest. Firmware that is not stubbed. Hardware that is not an always-ACK register file. The expensive bugs live on that boundary.

The boundary problem

Firmware teams emulate polite peripherals. Hardware teams SPICE fragments of the schematic. Neither run sees a stretch the sensor rejects or a GPIO that never became UART TX.

How HardLabs co-simulates

MCU execution plus datasheet-derived models on the buses your netlist wires. Decode traffic, assert on contracts, fail CI when the system misbehaves.

Ownership of the twin

Design partners keep the digital twin built from their files. Firmware stays yours; we do not train on customer designs.

HardLabs

What HardLabs does — join the design-partner pilot

We build a digital twin from your netlist, schematic, and BOM, run your real firmware against it, and fail CI when pinmux, buses, or timing contracts break — weeks before bring-up on hardware.

A digital twin of your hardware, built from your netlist, schematic, and BOM.
A virtual lab: scopes, logic analyzers, and firmware debuggers in simulation.
Auto-flagging of power-sequence errors, output contention, and race conditions.

Pilot details · App

Firmware-in-the-loop
Firmware-in-the-loop against your netlist — not stubs. Run unmodified .elf images on MCU simulation with board-aware I²C/SPI models and CI assertions.
Embedded system simulation
Embedded system simulation that includes your PCB buses and parts — not just the Cortex-M core — so drivers meet the real topology before hardware.
Runnable PCB digital twin
A PCB digital twin built from netlist and BOM — runnable under real firmware, with honest coverage gaps when a part is not modeled yet.
HardLabs vs QEMU

All topics

Hardware–software co-simulation that sees the boundary

The boundary problem

How HardLabs co-simulates

Ownership of the twin

What HardLabs does — join the design-partner pilot

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