I Built a HubSpot Alternative in 3 Months Using Only AI — Here's the Full Stack

HubSpot charges $800/month. I built the same thing for $0. No coding knowledge. No team. Just me and AI. The Full Stack (All Free) Layer Tool Cost Frontend React 18 + Vite $0 Database Supabase (free tier) $0 Styling TailwindCSS $0 Email Resend (100/day free) $0 Payments Razorpay $0 Hosting Netlify (free tier) $0 Total $0/month What It Does Email Automation Multi-step nurture sequences. Auto-enrollment. Smart stop on conversion. Payment recovery. CRM Contact management. Tags. Lifecycle tracking. Google Sheet sync. Attribution UTM tracking. Payment-to-ad matching. Campaign analytics. City detection via Cloudflare. Dashboard 9 pages. Revenue tracking. Email stats. Campaign comparison. The AI Part Every line of code was written through conversations with AI. I described features in plain English. AI built them. I tested. We iterated. 78 files. 20+ pages. 3 months. Zero coding knowledge. It's All Open Source ⭐ Claude Coach Kit — The full marketing automation platform ⭐ Marketing Prompts — 5