akifumi
Software Engineer / Audio Tool Developer
Last Updated: July 15, 2025
I am akifumi, a software engineer with over 7 years of experience building web applications. I develop browser-based audio tools including VIBE MIX LAB and LOFI WINDOW, focusing on making professional-grade audio processing accessible without installations or subscriptions.
My Background
I am not a professional musician or audio engineer. My expertise is in software engineering, specifically in building web applications that leverage browser APIs like Web Audio API to process audio entirely client-side.
My Relationship with Music
While I am not a professional musician, music has been a constant part of my life for over a decade.
AI-Assisted Development Approach
Since 2024, I have been using AI as an active engineering partner to collect and analyze mixing best practices from around the world. This includes researching BPM detection algorithms, key estimation methods, and transition techniques from academic papers, open-source projects, and professional mixing guides. AI helps me aggregate and apply this knowledge to improve the accuracy of VIBE MIX LAB's BPM and key detection. I document the algorithms and their limitations openly on the Specifications and Benchmark pages.
Why I Build These Tools
Professional DJ software is expensive and requires installation. Many online mixers are limited or require server-side processing that raises privacy concerns. I wanted to build tools that are free, private (audio never leaves your browser), and accessible on any device with a modern browser.
Methodology and Verification
I publish technical specifications and benchmark results so that users and third parties can verify the accuracy and limitations of my tools. The Benchmark page documents test conditions, results, and known failure cases. I welcome independent verification and feedback.
Commitment
I am committed to: (1) keeping all audio processing client-side for privacy, (2) being transparent about what my tools can and cannot do, (3) publishing verifiable benchmarks rather than marketing claims, and (4) continuously improving accuracy through AI-assisted research and community feedback.
Projects
VIBE MIX LAB: A browser-based DJ mixer that supports BPM sync, harmonic mixing, and crossfade transitions. LOFI WINDOW: A lo-fi music player and atmosphere generator. Both tools run entirely in the browser without server-side audio processing.
Contact
You can reach me on X (Twitter) at @akifumi_ai. I welcome bug reports, feature requests, and independent benchmark verifications.