Hack #3: Replit · Replit
6 Apr, 07:38
FaceTime From Mars 2159 - A voice-powered web app where you call AI colonists living on Mars in the year 2159. - Humans migrated to Mars in 2070. Now, 90 years later, you can pick up a quantum relay and have a real voice conversation with three Mars colonists — each with a unique ElevenLabs voice and AI personality powered by Claude. The colonists: • Zeph (16) — born on Mars, never seen Earth, thinks rain is terrifying • Chef Riku (34) — recreates Earth food from archives, has never tasted pizza • Dr. Nova (41) — terraforming chief, making Mars breathable How it uses ElevenLabs: Each character has a custom ElevenLabs voice ID with tuned settings (low stability for expressiveness, high style for personality). Voice responses are processed through a Web Audio API radio filter with static bursts to simulate a real deep-space transmission. Three distinct voices — a kid, an adult male, and an adult female — make each conversation feel completely different. How it uses Replit: Built entirely with Replit Agent assistance. Backend (FastAPI) and frontend (Next.js) both deployed on Replit as a single project with two workflows. Secrets manager handles API keys. Published as a web app anyone can use. Additional features: 3D interactive Mars/Earth scene (React Three Fiber), walkie-talkie push-to-talk, camera transitions between planets, ambient space sounds, signal glitches, Mars clock, suggested conversation topics, and end-call transmission report.
