Free ESP32-S3 Simulator
Xtensa LX7 · Dual-Core · 240 MHz
Simulate ESP32-S3 firmware in your browser — real Xtensa LX7 dual-core emulation via QEMU. USB OTG, vector extensions, 45 GPIOs. Write, compile, and run in seconds.
Free & open-source · QEMU Xtensa LX7 · No account needed
Supported ESP32-S3 boards
Velxio emulates three ESP32-S3 boards. Each runs the official ESP32 Arduino core compiled via arduino-cli.
ESP32-S3 DevKitC-1
Official Espressif development board. Dual-core Xtensa LX7 at 240 MHz, 45 GPIO, USB OTG, 512 KB SRAM.
XIAO ESP32-S3
Seeed Studio ultra-compact board (21×17.5 mm). 11 GPIO, USB-C, ideal for wearables and IoT.
Arduino Nano ESP32
ESP32-S3 in Arduino Nano form factor. USB-C, 14 digital + 8 analog pins, Arduino ecosystem compatibility.
ESP32-S3 vs ESP32 — What's new?
Xtensa LX7 CPU
Newer architecture with improved performance per clock. Same 240 MHz dual-core, but more efficient instruction pipeline.
USB OTG
Native USB device and host support — no external USB-to-UART chip needed. HID, CDC, MSC device classes.
Vector Instructions
Hardware-accelerated vector operations for AI/ML inference at the edge. TensorFlow Lite Micro optimized.
More GPIO
45 programmable GPIOs (vs 34 on ESP32). More ADC channels, touch pins, and peripheral options.
Frequently Asked Questions
- What is the ESP32-S3?
- The ESP32-S3 is an Xtensa LX7 dual-core microcontroller by Espressif running at 240 MHz. It adds USB OTG, vector instructions for AI/ML, and up to 45 GPIO pins compared to the original ESP32.
- Is the ESP32-S3 simulator free?
- Yes. Velxio is 100% free and open-source. Simulate ESP32-S3 code in your browser with real Xtensa LX7 emulation via QEMU — no cloud, no subscription.
- Which ESP32-S3 boards are supported?
- Velxio supports ESP32-S3 DevKitC-1, Seeed XIAO ESP32-S3, and Arduino Nano ESP32 (which uses the ESP32-S3 chip).
- Can I use Arduino libraries with ESP32-S3?
- Yes. Velxio compiles your sketch with the official ESP32 Arduino core. Install any library from the Arduino Library Manager and use it in your ESP32-S3 project.
- What is the difference between ESP32 and ESP32-S3?
- The ESP32-S3 uses the newer Xtensa LX7 architecture (vs LX6), adds USB OTG for native USB device support, includes vector instructions for AI workloads, and has more GPIO pins (45 vs 34).
Ready to simulate ESP32-S3?
Open the editor, select an ESP32-S3 board, and run your code instantly.
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