B2B ROI Calculator is a lightweight, production-ready HTML/CSS lead generation template built for B2B marketers, SaaS founders, and agency teams. It delivers a polished split-screen experience focused on turning visitors into subscribers.

Use case: Range sliders outputting a financial estimate emailed to users. Deploy it on landing pages, product sites, blog posts, or client projects without frameworks or build tools.

What’s included

• Responsive split-screen layout (desktop and mobile)
• Email capture form ready to connect to your ESP or API
• Custom brand colors via CSS variables (–accent-color: #0EA5E9, –bg-color: #F8FAFC)
• High-resolution preview.png for Gumroad, Etsy, or your storefront
• README.md, listing.txt, LICENSE.txt, and CUSTOMIZATION.md

Quick start: open index.html, edit colors in the :root block, and point the form to Mailchimp, ConvertKit, Brevo, Formspree, or your own backend.