flex

flex — AI SaaS Launch Video Generator (Agent Skill)

You built it. Now flex.

flex is an open-source AI agent skill that turns any SaaS product, startup website, or app into a short, polished product launch video — with motion, music, and ready-to-post share copy — in one command.

Use it to create SaaS launch videos, product demo videos, startup promo videos, and social-ready vertical reels without opening a video editor.

Stack-agnostic · Works with Claude Code, Codex, Cursor, Antigravity, opencode · MIT licensed

Repo: https://github.com/Jmaity434/flex
Docs / landing: enable GitHub Pages on the docs/ folder → https://jmaity434.github.io/flex/

What is flex?

flex is a product launch video generator for AI coding agents. You run /flex inside a project (or point it at a URL), and the agent:

Reads your product (code or live website)
Plans a 15–25 second launch storyboard
Builds a shareable SaaS marketing video
Writes captions for X, LinkedIn, and Instagram

It is built for founders, indie hackers, and marketers who ship fast and need a launch video for SaaS, app, or website without hiring an editor.

Keywords this project covers

AI launch video · SaaS launch video · product launch video generator · AI product demo video · startup promo video · website to video AI · Claude Code skill · agent skill video · automated SaaS marketing video · vertical product reel · open source launch video tool

Who is it for?

Audience	Use case
SaaS founders	Ship a launch video the same day you ship the product
Indie hackers	Turn a landing page into a LinkedIn / X / Reels clip
Agencies	Batch product videos for multiple client sites
Developers using AI agents	One command after `/build` — `/flex`

Install (AI agent skill)

Claude Code

/plugin marketplace add Jmaity434/flex
/plugin install flex@flex

Codex

codex plugin marketplace add Jmaity434/flex
codex plugin add flex@flex

Any agent (Cursor, Antigravity, opencode, Gemini CLI, …)

npx skills add https://github.com/Jmaity434/flex --skill flex

Add -g for a global install.

Quick start — generate a SaaS launch video

let's /flex

Or with options:

/flex --tone polished --format vertical
/flex --voice
/flex --formats landscape,vertical
/flex --ab default,yc-parody
/flex https://your-saas-landing-page.com
/flex doctor

Output: flex-output/flex.mp4 + poster + multi-platform share copy.

Features (SaaS & product video focused)

SaaS / product launch videos in 15–25 seconds
Website → video: deep scan of live landing pages (JS apps included)
Stack-agnostic: React, Next.js, Vue, Svelte, plain HTML — any stack
Vertical + landscape + square for Reels, Shorts, LinkedIn, X
Voiceover with language auto-detect (not English-only)
Brand kit support for consistent SaaS branding
A/B tones and batch mode for multiple products or sites
Share copy for X, LinkedIn, Instagram
Post-render hooks for your upload/post workflow
Works with Claude Code, Codex, Cursor, Google Antigravity, opencode

Why flex instead of a generic video editor?

Need	Traditional editor	flex
Time to first SaaS launch video	Hours	Minutes (one agent command)
Uses real product UI & copy	Manual screenshots	Reads code / scans site
Multi-platform captions	Extra work	Included
Fits AI coding workflow	Separate tool	Native agent skill

Requirements

AI agent that supports Agent Skills
Node.js 22+
FFmpeg on PATH
Full mode: Hyperframes CLI (npx hyperframes doctor)

Run /flex doctor to verify your environment.

Repository structure

skills/flex/ — main skill, slim mode, references, assets
examples/ — gallery for demo SaaS / product videos
docs/ — SEO landing page + marketplace notes (GitHub Pages)
Discovery paths for Claude, Codex, Antigravity, opencode
CHANGELOG.md — releases

License

MIT — free to use for commercial SaaS launches and client work.

Credits

Built for practical shipping. Inspired by the open agent-skills ecosystem.

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