DJ.Studio is a timeline-based digital audio workstation (DAW) designed for creating DJ mixes, mashups, radio shows, and video mixes. It runs on Mac and Windows operating systems. The software addresses a gap between traditional DJ software and production workflows by allowing users to arrange and edit tracks on a visual timeline, similar to a DAW, but with DJ-specific tools for harmonic mixing and beat-matched transitions. It uses algorithmic calculations to automatically order playlists based on tempo and key compatibility, drawing on the Camelot Wheel system for harmonic matching. Users can then manually adjust track length, transition styles, effects, and automation to refine the mix. The tool also includes stem separation, reactive video generation for MP4 export, and integration with external libraries such as Mixed In Key, rekordbox, Serato, VirtualDJ, Engine DJ, TRAKTOR, iTunes, and local computer files. Exports are compatible with Ableton Live for further production. Key features include automated playlist ordering through the Harmonize function, which applies millions of calculations to suggest optimal track sequences. Users can choose parameters for harmonic matching, tempo ranges, and transition types. The software provides tools to resolve tempo and key mismatches with a single click, and it offers a library of transition effects and samples that can be stacked for layered results. The Transitions module allows precise control over how tracks blend, while Stem separation lets users isolate vocal or instrumental elements for creative mixing. Track management capabilities support organizing large collections, and the Reactive Video feature automatically generates visualizations synchronized to the mix for video export. Typical workflows begin with importing tracks from supported DJ libraries or local folders. The user selects a playlist and applies automated ordering with optional manual override. Transitions are then customized by adjusting duration, effects, and automation curves. The mix can be auditioned in real time and edited on the timeline. Final output can be rendered as audio files or as MP4 video with visualizations for platforms like YouTube. The software is used by bedroom DJs, producers, and performing artists for creating polished mixes, live podcasts, or promotional content. As of the current version, DJ.Studio reports a community of over 360,000 users and has received recognition from industry figures in DJ culture.