Zephelin Trace

Copyright (c) 2025-2026 Analog Devices, Inc.

Copyright (c) 2025-2026 Antmicro

Zephelin Trace Viewer is a visualization tool for analyzing performance of Zephyr RTOS applications.

It visualizes traces, sensor readings and AI-related performance statistics collected by the Zephelin tool. It is built on top of:

• Zephelin library for collecting traces from Zephyr applications,
• Speedscope tool for analyzing traces.

Zephelin documentation | Zephelin library | Trace Viewer

Requirements

The visual interface leverages workspaces to manage a third-party dependencies like Speedscope. This requires yarn in version newer than 1.x, provided by corepack, which is usually installed together with Node.js:

# Allows to use package manages without having to install them
corepack enable
# Downloads specified version of yarn and all dependencies
yarn

Building and developing Zephelin Trace Viewer

• yarn dev - Starts a development server at http://localhost:5173/
• yarn build - Builds the application for production, emitting to dist/
• yarn build-singlefile - Builds the application, but inlines all assets (CSS, JS etc.) into HTML files
• yarn preview - Starts a server at http://localhost:4173/ to test production build locally
• yarn lint - Runs linter and applies fixes to code

Documentation

Documentation for Zephelin Trace Viewer is present in Zephelin documentation.

For links to example traces, check Zephelin's documentation on Trace Viewer usage and previews for Zephelin's samples.