Browse your folders exactly like Finder or Explorer — but with waveform, BPM and key rendered in place for every audio file. The filesystem is the source of truth: nothing is imported, nothing is hidden, your files stay where they live.
Flow is a file browser first. Folders and files appear in the order you expect — directories first, alphabetical — with waveforms, BPM, key and duration rendered inline for audio. Nothing is imported. Nothing is hidden from the filesystem.
Directories first, then audio files, then everything else — exactly like Finder or Explorer. Switch the folder to audio-only and it shows just your tracks, each with its waveform, BPM, key and duration rendered inline. The breadcrumb navigates by segment; back / forward history is kept per pane. Every column — filename, BPM, key, duration, artist, title, album — is sortable, reorderable and resizable, and remembers how you left it.
Press Cmd+M and a single input drops down with your most-recently-used target already selected. Type a few letters to fuzzy-filter across pinned folders, recent targets and their subfolders — a nested crate three levels deep surfaces from a fragment of its name. Or type a path to browse the live directory: Enter drills deeper, Enter on the resolved path commits the move. A copy / move toggle sits in the badge row; guards prevent no-op moves into the same or a parent folder. One key to open, one key to confirm.
Focus an audio row, press Cmd+S, and Flow renders a high-resolution spectrogram with clean axis labels (frequency, time, track title, length). Z toggles 1:1 zoom with horizontal scroll, Esc closes, Cmd+S inside the dialog saves the PNG anywhere. The colormap, resolution, gain and channel mode are configurable; the PNG is cached so the second view is instant. Generated by tools bundled inside the app — no separate install.
Pin the folders you live in — they get a custom icon and name, live in the sidebar, and every audio file inside is analyzed in the background so waveforms, BPM and key are ready the moment you browse in. Pinned folders are quick-move targets for Cmd+M, and the Move popover searches their subfolders too, so a pinned ~/Music root makes every nested crate reachable by typing a fragment. Folders on unmounted volumes stay pinned and show an Offline badge; metadata is reconciled when the volume returns.
Every audio analysis tool Flow needs is bundled inside the app. No separate installs, no dependencies to manage — just download and open.
And when you do want your DJ libraries kept in sync automatically — across Engine DJ, Rekordbox and beyond — pair Flow with Enginius.