esp32sim: An ESP32 emulator that runs in the browser
What happened
On October 17, 2026, a Show HN project called esp32sim appeared on the Hacker News front page. It is an emulator written in Rust that runs ESP32 firmware in the browser. It does instruction-level emulation and covers four SoCs: the Xtensa-based ESP32 and S3, and the RISC-V-based C3 and C6. The report says esp32sim can boot the real mask ROM, the second-stage bootloader and unmodified application images. The progress shown so far is limited to those chip supports and firmware booting.
Written by AI from the coverage · updated 2 hours ago
Coverage
Follow the reports to see the story from different sides.
- Hacker News front pageShow HN: Esp32sim – Run ESP32 firmware in the browser
esp32sim 是 Rust 编写的 ESP32 模拟器，指令级模拟 Xtensa（ESP32、S3）和 RISC-V（C3、C6）四种 SoC，可直接启动真实 mask ROM、二级 bootloader 和未修改的应用镜像。
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