How Was This Built?

by zev.arnovitz@gmail.com · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

Understand how any website is built. Get AI-powered explanations of tech stacks, architecture, design systems, and UX patterns.

Users

238

+5 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#59K

#50K among extensions

Version

0.5.2

updated 11 Feb 2026

Users

monthly, 10 months

Latest, 15 Oct 2026: 238 usersMove the mouse over the chart for any month

Ratings count

monthly, 10 months

Latest, 15 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About How Was This Built?

How Was This Built? helps you understand the technology behind any website. FEATURES: • One-click analysis of any website • Explains tech stack, architecture, design system, and UX patterns • Adapts explanations to your skill level (Beginner to Developer) • Follow-up chat to ask questions about the analysis • Detects frameworks: React, Vue, Next.js, Tailwind, and more • Extracts color palettes, fonts, and button styles HOW IT WORKS: 1. Click the extension icon on any website 2. Enter your free OpenRouter API key (one-time setup) 3. Get instant AI-powered analysis PRIVACY-FIRST: • 100% local storage - no accounts, no tracking • Bring Your Own API Key (BYOK) - you control costs • No data stored on our servers REQUIREMENTS: • Free OpenRouter API key (get at openrouter.ai/keys