# Funnel Lab

> A weekly letter from Sarthak Rawool about AI-run marketing funnels.

Canonical URL: https://sarthakrawool.com/newsletter/

Markdown twin: https://sarthakrawool.com/newsletter.md

## What It Is

Funnel Lab is a weekly newsletter for founders and agency owners who run their own growth. It explains the marketing systems behind AI-native software, with one funnel breakdown every Thursday.

Each issue focuses on one layer of the funnel:

- Capture
- Qualify
- Nurture
- Convert
- Retain

The newsletter emphasizes practical systems over theory: real prompts, real agent setups, real sequences, and notes on what broke.

## Who Writes It

Funnel Lab is written by Sarthak Rawool, a solo technical founder building Formasty and Mailrith.

Homepage: https://sarthakrawool.com/

## What Readers Get

### Breakdowns, not theory

Real funnels broken down step by step: tools, sequence, copy, numbers, what worked, what failed, and what was rebuilt.

### Funnels with AI inside

Each issue walks through the AI agent stack behind one marketing funnel stage.

### Copy-paste systems

Issues include prompts, agent setups, and sequence structures so readers can rebuild the system inside their own stack.

## Subscribe

Subscribe at https://sarthakrawool.com/newsletter/

The subscription endpoint is handled by a Cloudflare Worker and stores subscribers in Mailrith.

## Related Projects

- Formasty: https://formasty.com
- Mailrith: https://mailrith.com