# Simulator86

> Simulator86 is a web-based microcontroller (MCU) simulator. You write firmware in the built-in IDE — or upload an unmodified binary — and run it on simulated hardware in the browser. It catches logic, protocol, state-machine, and integration bugs before hardware exists. No physical boards, wiring, or local toolchain required.

Key facts:

- Runs real, unmodified firmware against simulated MCUs and peripherals, entirely in the browser at https://app.simulator86.com
- Hardware available today includes the STM32F405 (ARM Cortex-M4, 168 MHz, FPU) and the Seeed XIAO RP2040, with peripherals such as the SSD1306 OLED display (I2C), LCD1602 character display (HD44780, I2C), and 7-segment displays via GPIO
- Includes an AI agent: type a plain-language prompt (e.g. "a motion alarm that buzzes when someone opens the door") and it scaffolds a working, simulated project
- Projects are shareable by URL — anyone with the link can run the full simulation (firmware, wiring, peripherals) without installing anything
- Designed for embedded integration tests that run like software tests: scripted sensor input and fault injection at exact simulation-time offsets, in CI, without physical test labs
- Also used for prototyping without parts and learning embedded development
- Scope: catches logic, protocol, state-machine, integration, and long-run firmware bugs (leaks, fragmentation, counter wraps); does not model analog effects, power behavior, temperature, or flash wear
- Pricing: individual plan $20/month, team plan $150/month (see https://simulator86.com/#pricing for current details)

## Product

- [Homepage](https://simulator86.com/): overview and the prompt-to-project entry point
- [Simulation](https://simulator86.com/features/simulation): fidelity, supported MCUs and peripherals
- [Workflow](https://simulator86.com/features/workflow): IDE, simulator, and AI agent in one tab
- [Sharing](https://simulator86.com/features/sharing): run-anywhere project links
- [Cloud](https://simulator86.com/features/cloud): embedded integration tests as code — build boards, run firmware, inject faults, and query results from TypeScript
- [Enterprise](https://simulator86.com/enterprise): simulation for teams and CI
- [Documentation](https://docs.simulator86.com/): user guides and reference

## Comparisons

- [Simulator86 vs Wokwi](https://simulator86.com/compare/wokwi): both are browser-based, different fidelity and workflow philosophies
- [Simulator86 vs Renode](https://simulator86.com/compare/renode): browser-based vs desktop simulation framework

## Blog

- [Blog index](https://simulator86.com/blog)
- [Introducing the Simulator86 SDK](https://simulator86.com/blog/simulator86-sdk)
- [Building, running and simulating STM32F405](https://simulator86.com/blog/building-running-and-simulating-stm32f405)
- [Development minus the hardware](https://simulator86.com/blog/development-minus-the-hardware)
- [Clocks and LEDs](https://simulator86.com/blog/clocks-and-leds)
- [RTT host and interrupts](https://simulator86.com/blog/rtt-host-and-interrupts)

## Contact

- [Contact](https://simulator86.com/contact): support, questions, and requests for new simulated components
- [About](https://simulator86.com/about): the team behind Simulator86