DEV Community

Edwin Cruz
Edwin Cruz

Posted on

I built a fitness app where the AI roasts you for eating pizza (and hypes you when you PR)

The Problem with Every Fitness App

Every fitness app feels the same. Generic. Corporate. Bland.

Log your food. Count your calories. Get a little confetti animation. Zero personality. Zero fire.

I wanted something different — so I built Ghost Gains.

What Is Ghost Gains?

Ghost Gains is an AI-powered fitness tracker with a personality. The core idea: your AI actually reacts to what you do.

  • Hit a new PR on bench? Ghost goes crazy hyping you up.
  • Log a pizza at 11pm? Ghost roasts you (respectfully).

It's the difference between a sterile wellness app and having a real training partner in your pocket.

The Tech Stack

  • Ghost AI: Llama 3.3 70B via OpenRouter — chat, roasting, hype responses
  • Camera Scan: Gemini Vision API — point your camera at food, get instant macros
  • Voice Mode: ElevenLabs — Ghost literally speaks to you
  • Gamification: XP system, rank progression, day streaks
  • Privacy first: All data on device. No cloud. No tracking.

The Roast Mode Hook

The feature getting the most reaction from testers: Roast Mode.

When you log a cheat meal, Ghost responds. Never mean, always funny, always motivating underneath. People want accountability. They just don't want a robot doing it emotionlessly.

Where We're At

2,800+ warriors on the waitlist. Building toward full launch with exclusive rank badges and lifetime premium for early signups.

Join the waitlist: https://ghost-gains--ghostgains37.replit.app/

Happy to answer questions about the tech, the build, or the AI routing architecture.

Top comments (0)