I built an AI observability platform with $0 — Cognilumin (3 modules, no dependencies)

I'm a solo developer, and I've been building Cognilumin for the past few months — mostly late nights and weekends. It's now live, completely free, and I'd love some honest feedback from the Product Hunt community.

Cognilumin is a stateless AI infrastructure platform with three tools:

💡 Illuminator — paste any complex topic and get a structured explanation with mental models, analogies, and a key takeaway.

🧠 Topology Visualizer — describe a system scenario and watch a live particle flow‑field map the state in real time.

🤖 Execution Logs — give an AI agent a task and trace its reasoning step‑by‑step with hex‑formatted indices.

Stack: Vanilla PHP + vanilla JS. Zero frameworks. Multi‑provider AI backend (Gemini → Groq → OpenRouter) with automatic failover. Stateless — no logins, no database. Runs on $0/month.

Try it: https://cognilumin.com

I'm especially keen to hear what feels broken or confusing. Happy to answer any questions about the stack, the prompts, or the architecture.