Build this tool: Built With — Website Technology Detector
Product folder name: Built With

PRODUCT BRIEF
Paste any public website URL (with or without https://). The tool fetches the page, fingerprints CMS / ecommerce / JS frameworks / analytics / CDN / hosting / server / payments / fonts from headers + HTML + cookies + script/link URLs, and also lists plugins and themes when public asset paths reveal them (especially WordPress /wp-content/plugins|themes). Outputs an on-screen report plus TXT/CSV export. No API key required.

CONTEXT
Difficulty: Medium
Category: SEO / Web / Creator tools

TREND HOOK
Creators and freelancers constantly ask “what is that site built with?” — BuiltWith.com-style lookups, but as a free local desktop tool.

VIDEO ANGLE
Short: “Paste a URL. Hit Scan. Here’s the stack.” Long: build in Cursor, live-scan wordpress.org, show plugins/themes + export.

WHY THIS TOOL
Classic Casey freebie: one job, instant demo payoff, ships as Python GUI + EXE.

STACK (standalone desktop app)
- Python 3 + tkinter GUI — standalone desktop tool (not a website).
- Even if the brief says "web app" / "site", ship a Python desktop GUI for v1.
- Include: main .py (built_with.py), requirements.txt, Run Built With.bat, build_exe.bat (PyInstaller), exports/ folder.
- Network: requests (fetch page). Deterministic local fingerprinting — NO Gemini / NO LLM for v1.
- Smoke-test with: py -3 built_with.py --smoke --url wordpress.org

GUI RULES (Casey Builds It chrome)
- Dark palette: BG #0b0e1c, BG_ELEVATED #12182c, BG_PANEL #161c37, TEXT #f4f1ea, MUTED #8891c2, AMBER #ffab3d, TEAL #5eead4, BORDER #2a3358.
- Window title: "Built With — Casey Builds It"
- Hero: CASEY BUILDS IT eyebrow + "Built" / " With" split hero + one How to use line.
- Fonts: Space Grotesk / JetBrains Mono with Segoe UI / Consolas fallbacks.
- Accent.TButton + Ghost.TButton; clam ttk theme.
- Clear field labels; real URL entry (not fake demos).
- Dropdowns: NEVER ttk.Combobox. (This tool does not need dropdowns.)
- Handle window close with WM_DELETE_WINDOW.
- Scan work in a background thread; UI updates via after(...).
- One job per tool; working Copy / Export TXT / Export CSV / Open exports.

URL HANDLING (required)
- Accept bare domains (example.com), www hosts, http://, https://, //host, and paste junk (quotes / angle brackets).
- If scheme omitted: try https first, then http on connection failure.
- Label the field: Website URL (https:// optional).

DETECTION (required)
- Curated signature list for common CMS, ecommerce, JS, analytics, marketing, CDN, hosting, server, payments, fonts, media, security.
- Match against HTML body, response headers, cookies, meta generator, script src, link href, URL path.
- Plugins / themes:
  - Extract WordPress slugs from /wp-content/plugins/, /mu-plugins/, /themes/
  - Drupal module paths when public
  - Best-effort Shopify app CDN fingerprints
  - Friendly names for popular WP plugin/theme slugs; title-case unknown slugs
  - Filter junk path segments (dist, assets, css, js, etc.)
- Confidence labels: high / medium / low
- Report note: plugins/themes only appear when assets load on this page.

APIs & KEYS
- No API keys for v1. Do not add Gemini for fingerprinting.
- Never hardcode secrets.
- Network fetch only; fail clearly on timeout / DNS / TLS errors.

IMPLEMENTATION NOTES
- Categories include Plugin and Theme in the results list.
- Export TXT report + CSV rows (technology, category, confidence, evidence).
- Also write builtwith_latest.txt on TXT export.
- Validate empty URL; show clear errors in status/report.
- Keep v1 focused: single URL scan (batch can be a later customization).

DEMO INPUT → OUTPUT (from live scan)
- Real field labels + sample values from MOTION_DEMO:
  - Website URL (https:// optional) | wordpress.org  ← ONLY input field
  - Detected Technologies + Report = OUTPUT panels after scan (never type into them)
- Primary button name: Scan site
- Example result lines — MUST be DISTINCT (unique episode hooks / twists). NEVER list the same title with only the number changed:
  - CMS | WordPress Core Engine detected in meta headers
  - Plugin | Gutenberg Editor active via wp-content assets
  - Plugin | Pub Sync automated content distribution hook
  - Theme | Wporg Main 2022 custom parent skin
  - Theme | Wporg Parent 2021 fallback base framework
  - Status | Done - 11 technologies, 2 plugins, 2 themes, on https://wordpress.org/

OUTPUT
- Runnable standalone Python app (built_with.py)
- requirements.txt + Run Built With.bat + build_exe.bat → BuiltWith.exe
- In-app how-to line
- VIDEO_SCRIPT.txt + MOTION_DEMO.txt aligned to real field names
- Example of typical input → output (in comments / MOTION_DEMO, not fake UI samples)