The ESP32JTAG is a small, wireless, all-in-one ESP32 wireless JTAG tool by EZ32 Inc. (Markham, Ontario) that seeks to ease the development of embedded systems by integrating numerous functions into any of them.
The ESP32JTAG is based on the core of a dual-core ESP32-S3 that operates at a frequency of 266 MHz and has flash and PSRAM (16 and 8 MB, respectively). Topping that, the board includes an on-board FPGA (a Lattice iCE40UP5K) to undertake configurable logic operations. It is designed to assist in MCU debugging (JTAG/SWD), FPGA programming, logic analysis using 16 channels and up to 250 MHz, and a web-based UART terminal, and is available over Wi-Fi or USB-C.
Its wireless and driver-free functioning is one of the most outstanding features. You can quickly charge the board (USB-C), and then connect it to its in-board webserver with Wi-Fi (bandwidth up to Wi-Fi 6 and Bluetooth 5.0), and begin using it on any PC, tablet or smartphone again, no proprietary drivers are required. It is a design that is intended to decrease the clutter (not a variety of dongles that you need), liberate you to stop being connected via cables and debug in more versatile settings.
The ESP32JTAG is open hardware and open source: schematics, BOM, firmware and documentation are all released. It implies that you can check, alter, add or customise the tool to your embedded workflow. And the team explicitly highlights that the tool is intended to replace older, limited debug probes like ST-Link dongles by offering far more capability in one unit.
In terms of form factor, it is small (approx. 33 x 40 x 5 mm) and powered via USB-C. The target audience is embedded engineers working with microcontrollers, FPGAs, logic analysis and serial monitoring—especially those who dislike juggling multiple separate tools.
The ESP32JTAG can be readily adapted to most development environments since it is compatible with a large number of the existing open-source software tools and frameworks. This tool is compatible with OpenOCD on JTAG and SWD debugging, Sigrok/Pulseview on logic analysis and open-source basic web-based configuration of a UART and device, which can be accessed on any browser; no driver installation is needed. It uses a firmware that is based on ESP-IDF and TinyUSB and thus provides stability and cross-platform compatibility with Windows, macOS, and Linux. It also allows its users to adjust or enhance its capabilities with open-source firmware updates offered by EZ32 at GitHub.
The ESP32JTAG is currently listed at a price of US $139 on the Crowd Supply campaign page. According to the campaign, shipping is free within the U.S., and international shipping is around $12. As for availability, the product is still in its crowdfunding / pre-order phase with the campaign running until December 4 2025. Delivery is planned for February 14 2026.
If you are working on embedded hardware, ESP32, firmware or FPGA development and want a single compact device that handles JTAG/SWD debugging, logic analysis, FPGA config, UART and offers wireless access with open-source software and hardware, the ESP32JTAG tool is a compelling modern choice.
Sayantan Nandy