How to Build a Complete Email Automation System for Free (React + Supabase)

Want to build your own email automation without paying $200/month? Here is the complete stack — all free: Architecture New lead → Supabase DB → Cron checks → Resend API sends email → Track opens/clicks What You Need Supabase (free tier — database + edge functions) Resend (100 emails/day free) React + Vite (frontend dashboard) Cron job (any scheduler) The Flow Lead enters your system (form, payment, Google Sheet) Cron job checks for new unenrolled leads Enrolls them in a multi-step sequence Sends emails at scheduled intervals (Day 0, Day 2, Day 5) Tracks opens and clicks Auto-stops when they convert Get the Full Code I open-sourced the entire system: ⭐ Claude Coach Kit Includes email sequences, payment tracking, UTM attribution, and a 9-page dashboard. MIT licensed. Free forever.