Noteligence — AI Second Brain

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NOTELIGENCE — AI note-taking app, complete source + setup guideNotes app with an AI layer built in: chat about your notes, askquestions about attached images and files, and a working free/paidsubscription split — all in a single, clean HTML/JS frontend backedby a Cloudflare Worker.WHAT IT DOES- Rich note-taking with markdown, search, pinning, attachments- AI chat that reads your notes and attached files for context- Image understanding (ask questions about photos/screenshots you've attached)- Free tier + $2.99/mo paid tier, enforced server-side (not just hidden buttons — the backend is the actual source of truth)- Full account lifecycle: signup, Google sign-in, password reset, account deletion that actually cleans up every data storeSTACK- Frontend: single HTML file, vanilla JS, no build step- Auth + database: Firebase (Realtime DB, Auth)- File storage: Supabase Storage- Backend: Cloudflare Worker (proxies AI + payment calls, holds all secret keys server-side — the browser never sees an API key)- AI: Groq- Payments: Stripe, full PaymentIntent + webhook flowWHY THE BACKEND IS WORTH SOMETHING ON ITS OWNThis isn't a UI wrapped around a raw API key. The Worker:- Independently re-verifies every payment with Stripe before granting a subscription — never trusts what the browser reports- Is idempotent — a double-click or a dropped connection can't grant two subscriptions for one payment- Enforces daily usage limits authoritatively server-side, closing the "just edit a variable in devtools" bypass that a lot of small SaaS apps are vulnerable to- Has a documented history of real fixes — this shipped, got used, and got iterated on, it wasn't written once and abandonedWHAT'S INCLUDED- Full source: the app file + the Cloudflare Worker file- Firebase security rules (ready to paste in)- A written architecture note explaining the design decisions- A complete step-by-step setup guide — no prior Firebase/ Supabase/Cloudflare experience assumed, every account creation and config step spelled out- App icon / logo source files (branding included)WHAT YOU'RE BUYINGThis is source code and a working blueprint, not a runningbusiness — there's no existing user base or revenue attached tothis listing. Every piece runs on generous free tiers to start(Cloudflare Workers, Firebase, Supabase all have free tiers sizedfor genuine early usage), so your only real cost at low volume isAI usage through Groq, which is inexpensive per-token by design.Once sold, I shut down my own deployment and don't resell thiscodebase to anyone else — it's a one-buyer sale.WHY I'M SELLINGMoving fast on a new, more ambitious project and want to put myfull attention there rather than let this sit unlaunched. It's ingood enough shape that someone else finishing the job made moresense than me shelving it.Happy to answer technical questions before you buy.