It is powered by Rust most “open” AI devices are actually closed on the backend, limiting customization and privacy. EchoKit is fully open—from ESP32-S3 hardware to the Rust-based server. You can customize ASR, TTS (including voice cloning), LLM prompts, and even add your own MCP actions. We’d love your feedback, ideas, and contributions. Try it out, check the code, and let us know what you think!