# Esp32sim runs ESP32 firmware in a browser without physical boards

_Published Saturday, October 17, 2026 at 5:18 PM EDT · Products · Latest · Tier 2 — Notable_

![Open-source ESP32 emulator. Run real firmware locally or in your browser — no hardware, no cloud, no subscription. - mikroverk/esp32sim — Primary](https://opengraph.githubassets.com/0dc538b109e10386757901c7e263973dc4d6f69ba188ffc4db71c0a72ab0e861/mikroverk/esp32sim)

The esp32sim project offers a browser simulator that its developers say boots real ESP32 ROMs, bootloaders and unmodified application images. It models four ESP32 chips across Xtensa and RISC-V processor architectures, giving firmware developers a way to run projects without physical boards. The code uses the MIT license.

The browser version runs through WebAssembly, with demonstrations including display panels and ESP32-C3 and C6 firmware. The developers report real-time operation for several demos in Chrome. Browser networking lacks the host-socket access available in the command-line version. Hardware comparisons also have limits: trace checks normalize exceptions and resynchronize delay loops rather than establish uninterrupted cycle-by-cycle agreement.

## Sources

- [github.com](https://github.com/mikroverk/esp32sim)

---
Canonical: https://techandbusiness.org/newswire/peQtKv5bEsoHAiWvDcErqh
Published: 2026-10-17T21:18:24.910Z
Story chronology: 2026-10-17T13:51:08.000Z
Retrieved: 2026-10-17T23:44:33.774Z
Publisher: Tech & Business (techandbusiness.org)