Developer builds full-featured DJ console in a single 400KB HTML file

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A developer has launched MasterDJ AI, a browser-based DJ platform contained entirely within a single HTML file of roughly 400KB. The app requires no frameworks, external dependencies, or server to run its core features, relying on the Web Audio API for real-time audio processing and the Canvas API for waveform visualization. Key features include dual-deck mixing, a 3-band equalizer, BPM detection, karaoke mode via center channel cancellation, and support for 13 languages. A standout feature allows audiences at live events to scan a QR code and submit song requests directly to the DJ's console in real time. The app is free to use, with a one-time $14.99 Pro upgrade unlocking effects, karaoke, hot cues, and premium skins.

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