I Built 37 Free Browser-Based Tools with Flask and No JavaScript Framework

No React. No Next.js. No build step. No node_modules. I built TextKit , a collection of 37 free online tools for text processing, data cleaning, and developer utilities, using Flask, Tailwind CSS via CDN, and vanilla JavaScript. The entire project starts with python app.py . Here's the stack, the architecture decisions, and what I've learned. The stack Python + Flask → serves HTML via Jinja2 templates Tailwind CSS CDN → styling, zero build config Vanilla JavaScript → all tool logic, 100% client-side Markdown + YAML → blog system Render → hosting Cloudflare → DNS + caching Umami → privacy-friendly analytics No database. No auth system. No npm. The entire deployment is a Flask app serving static-ish pages. Why no framework? Because these tools don't need one. A JSON formatter takes text input, calls JSON.parse() and JSON.stringify() , and displays the result. A password generator calls crypto.getRandomValues() and builds a string. A diff checker runs an LCS algorithm on two arrays of str