ModMix

Game concept shuffler.

Two games x three mechanic tags -> AI-generated one-page game design doc + concept art, in ~30 seconds.

-> Try it: modmix.io

Built for indie devs, game design students, and gamers who want to dream up games that should exist but don't yet.

ModMix is a personal creativity tool: platform-neutral, not tied to any engine, storefront, or creation platform.

It is not for generating in-game assets, mods, or playable content.

ModMix produces concepts: game concept brainstorming and design ideation you take elsewhere to actually build.

What you get

Drop in 1~2 reference games and three mechanic tags, such as roguelite, deck-building, or time-loop.

ModMix returns:

• Concept -- title + one-line elevator pitch
• System -- core loop + signature mechanic
• Scope -- solo-dev / small-team / studio realistic boundaries
• Hook -- why a player would tell their friends
• Concept art -- single-frame illustration in retro 90s game cover style

One page. 3040 seconds. ~$0.04 per generation.

Tech

Next.js 15. TypeScript. Anthropic Claude Sonnet 4.6 structured output. fal.ai Flux schnell. Upstash Redis rate limit. Sentry. Vercel.

Development

This repo is a 3-weekend MVP build (2026-04-18 -> 2026-05-09).

See CLAUDE.md for project context, sprint structure, and conventions.

App source lives under web/.

cd web
bun install
cp .env.example .env.local  # then fill in keys
bun dev

Required env vars: ANTHROPIC_API_KEY, FAL_API_KEY, UPSTASH_REDIS_REST_URL, UPSTASH_REDIS_REST_TOKEN, NEXT_PUBLIC_SENTRY_DSN, SENTRY_AUTH_TOKEN, NEXT_PUBLIC_SITE_URL.

Status

Live since 2026-04-25. v0.1 -- initial public launch. v0.2 backlog tracked in 04 Backlog/.

License

MIT -- see LICENSE. Fork freely.

Repo