Building Interactive Web Tools with Pure...

When we set out to build 7 interactive calculators for Optistream — a French streaming analytics site — we made a deliberate choice: no React, no Vue, no frameworks. Just pure HTML, CSS, and vanilla JavaScript, embedded directly into WordPress pages. Here's what we learned. Why No Framework? Our calculators needed to: Load instantly (no 200KB+ bundle) Work inside WordPress content areas Be maintainable by a small team Support LiteSpeed Cache without breaking A framework would have been overkill.