# Make a product demo video from a screen recording, on your Mac.

Page: https://crispdemo.com/product-demo-video

Someone asks what your app does, and the best thing you can send is a silent three-minute screen recording with text too small to read on a phone.

CrispDemo is a Mac app that turns that recording into a finished product demo video. Your coding agent rebuilds the screens and writes the script, CrispDemo adds a voice and music, and your Mac renders the file.

## How to make a product demo video on a Mac.

1. **Add your screen recordings.** Drop in MP4 or MOV recordings of your app, or use Record screen in CrispDemo. A video can use up to 12 recordings and screenshots. Your original files are never changed.
2. **Write the brief and pick the places.** Say in one or two sentences what viewers should take away. Then pick where the video will be posted, such as your website, YouTube or LinkedIn.
3. **Let your coding agent build the draft.** Claude Code, Codex or OpenCode reads frames from the recording, rebuilds each screen as HTML, checks it against the recording and writes the script. CrispDemo adds the voice and music.
4. **Review, change and export.** Gemini reviews the finished video and lists what to fix. Ask for changes in plain words, then export an MP4 for each look. Your Mac renders every file.

## A voice, and changes in plain words.

- **Narration without a microphone.** Choose from 8 Gemini voices and play a sample of each before you pick. Narration can be in English, German, French or Spanish.
- **Changes for the whole video or one scene.** Ask your coding agent in the Studio chat. It answers there, and the video is updated.

## What do I need on my Mac?

A Mac with Apple silicon and one coding agent: Claude Code, Codex or OpenCode. CrispDemo helps you install and sign in to the one you pick.

## Is the video rendered on my Mac?

Yes. CrispDemo renders every look on your Mac, and rendering is free. The voice, the music and the Gemini review come from Google and are paid per use.

## Which files can I export?

An MP4 with H.264 video and AAC sound at 30 frames a second, in 1920 by 1080, 1080 by 1920 or 1080 by 1350, depending on the look. You can also save captions as .vtt and .srt files.

## How long does a first draft take?

In our own test runs with Claude Code, the first draft of a 20 to 40 second video took 7 to 16 minutes.

## Early access

CrispDemo is in early access, for Mac (Apple silicon). Tell us about your app and where you post, and we'll let you know when you can try it. Contact: https://crispdemo.com/contact