Generate captions, split the stems.
A desktop subtitle and audio workspace. AI speech-to-text, stem separation, word-level karaoke sync, and canvas subtitle transforms — built for speed and precision.
The whole workspace, view by view.
Open a file, run a caption pass, and split the mix into stems — all in one window.
Edit like a video editor.
Drag, trim and split cues against the waveform, so you can see exactly where speech starts and ends. Zoom stays anchored to the playhead while you make small adjustments.
Land every word on the beat.
Most editors treat a whole sentence as one block. Aidio times each word — tap along as the track plays, then nudge the boundaries until they sit right.
Style it, karaoke colours and all.
Fonts, colours, outlines, shadows, background boxes and alignment — the full ASS styling set, previewed on the video as you change it, so it renders the same everywhere.
Place captions directly on the frame.
Drag a subtitle across the live video canvas and drop it where it belongs — no coordinate fields, no guessing.
Scale it to fit the shot.
Grab the handles and size the caption to the frame — large for a music video, compact for a reel, with custom aspect ratios supported.
Angle it however you like.
Rotate a caption off the horizontal so it follows the tilt of the shot.
Inspect the structured data.
Open the JSON view to check every timestamp, word boundary and style value before you export.
Four tools, one window.
Transcribing, separating, timing and styling, without leaving the app.
Transcription in one pass
Speech becomes cued subtitles using Whisper — no queue, no minute cap, however long the track runs.
Split the mix into stems
Pull the vocal out of a noisy track in one click — two stems or four, depending on the model you pick — then transcribe against a clean take.
Word-by-word timing
Tap along to sync each word, or nudge boundaries by hand — for karaoke and for social captions that highlight as they play.
Captions placed on the frame
Drag, scale and rotate subtitles over the live video preview and see the result as you edit.
Eight subtitle formats
Import and export .srt, .vtt, .ttml, .sbv, .sub, .lrc, .ass and .ssa — and pull subtitles already embedded in a video.
Nothing to set up
The transcription model, the separator and the encoder all ship with the app. No Python, no command line.
Formats & specifications
Everything Aidio reads, writes and runs on your own machine.
- macOS 12+ (Apple Silicon accelerated) or Windows 10+.
- Transcription and stem separation run on your own CPU and GPU.
- Subtitles already embedded in a video are detected and imported.
- Projects save tracks, cues, styles and markers in one portable file.
- No minute limits on a transcription or stem pass.
Generate, time and style — then ship the file.
One window from raw audio to a styled, timed subtitle file. Pull it down and caption your next track.