FAQ

Why not just prompt a frontier model for a product video?#

A one-prompt video looks impressive and is wrong: the model has never seen your product, so it redraws a generic dashboard, invents features, metrics and customers, and wraps it in HUD labels and purple gradients. demovie gives the model your real app — screenshots, element maps, your brand and vocabulary — and then checks the result (QA) so it stays true. See the side-by-side in the README.

Why not Remotion?#

Remotion is free only for individuals, non-profits and companies of up to three people; larger companies need a paid license. demovie is MIT, so anyone can use it. Compositions are plain HTML + GSAP, rendered frame by frame with Playwright and your system ffmpeg. See licensing and terms.

Does it use my Claude (or ChatGPT, or Cursor) subscription?#

demovie itself never logs in to any AI service and never reads tokens. Your agent — which you installed and signed in to — uses demovie as a tool. demovie make just starts that agent for you. In CI the action passes through API keys.

Where does my data go?#

Nowhere. Captures, videos and caches stay in your repository's .demovie/ folder (captures, caches and outputs are gitignored). There is no telemetry. The only network calls are to your own app, and — only if you configure them and approve the cost — to ElevenLabs or OpenAI for voiceover or music, and whatever your agent does on its own.

Which frameworks are supported?#

Next.js (App and Pages Router) is detected automatically, including route groups, dynamic routes, middleware/proxy protection and monorepos. Any other web app works in generic mode: npx demovie init --url http://localhost:5173.

Can I edit the video by hand?#

Yes. composition/main.js is ordinary JavaScript with GSAP; npx demovie preview <slug> hot-reloads as you edit.

How is this different from brag, Remotion or HyperFrames?#

brag turns a project into a quick launch post with one command; Remotion and HyperFrames are frameworks for building videos as code. demovie is for videos that must show your real, current product, logins and data included, checked before they render and remade on every release. See how demovie compares, with measurements from one real app made four ways.