A complete, production-ready SaaS for organizing knowledge: a drag-and-drop cheatsheet builder (Markdown, syntax-highlighted code, charts, KaTeX equations, mind maps, PDF export) plus built-in Kanban boards, all with cloud auto-save. This is an asset sale of a finished product, not a cash-flowing business. Launched November 2025, it earned $90.88 across 12 one-time Stripe purchases and has had no sales since December 2025 — it has never been actively marketed. What it does have: 54 registered users, 1,300+ unique visitors from 54 countries, and steady organic traffic of roughly 120-225 visitors per month with zero ad spend, ever. Built on Next.js 15, TypeScript, React 19 and MongoDB Atlas. Includes a full admin dashboard (users, products, discount codes, refunds, email templates, banners), Stripe checkout, Billingo EU invoicing, JWT auth and a transactional email system. Running costs are $20.08 per year — just the domain. Vercel and MongoDB Atlas both sit on free tiers, so there is no monthly burn. Best fit for a developer, or an operator with a productivity or dev-tools audience, who wants a finished codebase and a live domain to relaunch. The untapped levers are obvious: a Product Hunt launch (never done), a subscription tier (today it is one-time purchases averaging $7.57), and SEO on "cheatsheet maker" and "kanban tool" queries.