I built this 48-second motion graphic promo video 100% with AI and Antigravity in under 4 hours (Cost: ~24€)

Hey 👋, I needed a snappy, fast-paced promo video for my new app, but hiring a motion designer on Upwork would have taken days and cost hundreds of dollars. I wanted to see if I could build a professional-looking promotional video purely using AI orchestration tools. It took me exactly 4 hours from blank screen to the final rendered MP4. Here is the exact stack and cost breakdown I used: **The Tech Stack:** * **Script / Ideation:** ChatGPT (Free tier) * **Background Music:** Suno AI (9€/month for the pro tier to get commercial rights) * **Voiceover & Transcript Timestamps:** ElevenLabs (Free tier used for testing, exact word-level timestamp JSON) * **Animation Framework:** Remotion (React-based video framework - Free/Open Source) * **Orchestrating the Code & UI:** Antigravity (using a mix of Gemini 3.1 Pro + Claude 4.6 Opus to stitch the Remotion components, kinetic typography, and animations together without manually writing the React code - 15€/month) **Total Cost:** \~24€…