RoastYourMix

Independent music producers often finish a mix and hit a wall: "Is this actually good?" Professional mixing feedback costs $50–200 per session, takes days, and requires finding an available engineer. Most producers either release subpar mixes or spend weeks second-guessing themselves. The feedback loop between finishing a mix and knowing what's wrong with it was too slow, too expensive, and too inaccessible.

RoastYourMix is a web platform that gives producers instant, brutally honest feedback on their mixes. Users upload an audio file and receive an AI-generated analysis within seconds -not vague encouragement, but specific, actionable critique covering frequency balance, dynamics, stereo imaging, and clarity.

The platform operates on three tiers: a free "roast" with a health score and quick fixes, a Pro Report (€19.99) with detailed frequency and dynamics breakdowns delivered as a downloadable PDF, and a Mix Fix tier (€99.99) where a human engineer applies corrections to the actual mix.

FFmpeg for audio analysis. Rather than relying on a third-party API, the platform runs parallel FFmpeg processes server-side -loudness metering (EBU R128), 4-band spectrum analysis, stereo correlation via aphasemeter, and master detection heuristics. This keeps per-analysis costs near zero and gives full control over the metrics pipeline.

OpenAI for personality, not measurement. The AI layer interprets the raw metrics and generates the "roast" -translating "-8.2 LUFS with 4.1 LU range" into language producers actually understand. The technical analysis is deterministic; only the presentation is generative.

Next.js 14 on a single Hetzner VPS. No Vercel, no serverless. PostgreSQL, Redis, PM2, and Nginx on one box. This keeps infrastructure costs under €10/month while handling the current traffic comfortably.

Programmatic SEO at scale. 210+ pages across 11 content categories (genres, mixing problems, instruments, DAW guides, comparisons) -all generated from structured TypeScript data files with shared components. This drives organic discovery without manual content creation for each page.

Stripe Checkout with webhook-driven fulfillment. Payment confirmation triggers report generation and email delivery automatically -no polling, no manual intervention.

The platform is live at roastyourmix.com with 231 indexed URLs, a Lighthouse SEO score of 100, and accessibility score of 100. The programmatic SEO infrastructure generates long-tail organic traffic across genre-specific, problem-specific, and tool-specific searches. The admin panel provides full operational control -submission management, analytics, invoicing, and bulk operations -with a custom dark/light theme built without any UI framework dependency.

From upload to feedback in under 30 seconds. From idea to 210+ SEO pages in under a week. Built, deployed, and maintained by a solo developer.