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

1. Lead enters your system (form, payment, Google Sheet)
2. Cron job checks for new unenrolled leads
3. Enrolls them in a multi-step sequence
4. Sends emails at scheduled intervals (Day 0, Day 2, Day 5)
5. Tracks opens and clicks
6. 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.