Native macOS · a Left Inverse product
Every word,
right on cue.
Caption Studio burns word-by-word captions into short-form video, locally.
14-day free trial when it ships · one payment, no subscriptions · macOS 14+
Real clip, real transcript, live-rendered captions - two cues fixed in the editor below.
The editor
The transcript is the timeline.
Auto Caption transcribes on your Mac and chunks the words into two- and three-word cues, each with its keyword picked. Every cue becomes an editable row - the rows drive the video, and the preview holds the exact frame of whatever you click. Watch the editor work:
Also in the app: split and merge cues, hover-to-seek. Projects autosave as a .captionproj package.
The look
What you scrub is what you ship.
Eight display faces ship in the box, and every knob renders on the playing clip. Try it - this panel mirrors the app's style inspector.
Font
Highlight color
Browser recreation - in the app, the overlay is drawn by the exact CoreText code that renders your export, so the preview never lies.
Pricing
Try everything. Pay once.
The trial is the whole app for 14 days. When it lapses, only Export locks - you can keep editing, styling and previewing for as long as you like, and buy the moment you're ready to ship.
Pay onceprice announced at launch
- 14-day free trial - the whole app, no account needed
- After the trial, only Export locks - edit, style and preview stay open
- No subscriptions - buy it, own it
- License key by email - activation works offline
- macOS 14 or later
Sold under the Left Inverse refund policy
Get it first
The notarized build is gated on Apple's developer-account approval. Leave your email and we'll send the download - and the launch price - the day it goes live.
FAQ
Questions, answered.
Is anything uploaded?
No. Playback, transcription, styling, preview and export all run on your Mac. The first Auto Caption fetches the Whisper speech model once; after that, transcription works offline. Your footage, audio and words never leave the machine.
What happens when the trial ends?
Only Export locks. You can keep opening projects, editing cues, styling and previewing - everything except writing the final MP4. Buy once, paste your key, and Export unlocks.
How does the license work?
You get a key by email. Paste it into the app's license sheet and you're done - the check runs offline, same as every Left Inverse product.
What does Export produce?
A standard MP4 - H.264 video, AAC audio - with the captions burned in. The export is verified before it lands, so a failed or cancelled export never leaves a broken file at the destination.
What if I move the source video?
Projects save as a .captionproj package with autosave.
If the source clip has moved when you reopen, the app asks you to
relink it - your cues, timing and styling survive intact.
What about refunds?
Straightforward - see the refund policy. It applies to every Left Inverse product.