I built a cold email optimizer in 48h — from to live product

The Problem

Cold email is still the #1 B2B outreach channel. But most people struggle with:

• Writing multiple variants to A/B test
• Knowing which subject lines get opens
• Paying -99/month for tools that do way too much

The Build

48 hours. Pure HTML + JavaScript. No framework, no build step, no server.

Stack:

• Frontend: Vanilla HTML/CSS/JS (glassmorphism UI)
• AI: Groq API (Llama 3.3 70B) — user brings their own free key
• Hosting: GitHub Pages (free)
• Payments: Gumroad ( lifetime)

Total infrastructure cost: /month

How It Works

1. Get a free Groq API key at console.groq.com (60 seconds)
2. Paste your cold email draft
3. Click Generate
4. Get 5 optimized variants in ~3 seconds

Each variant: different tone (Direct, Professional, Bold, Empathetic, Casual) with optimized subject line + explanation of why it works.

Key Lesson

Simple beats complex. First version was Next.js — multiple failed Vercel deployments wasted hours. Stripped to pure HTML, deployed in 10 minutes, works perfectly.

** is the magic price point.** Below the 'think about it' threshold. Impulse buy for anyone doing cold outreach.

Try It

Free tool: https://aliefwidjonarko1005-dotcom.github.io/email-optimizer/

Lifetime access (): https://7848939965107.gumroad.com/l/xnntrz

Built with Groq API + Llama 3.3 70B. Feedback welcome!