What is Flask?
FrameworkFlask is a web framework: Lightweight Python web framework. Tech Stack Detector identifies Flask on any website by analysing HTTP response headers.
Flask is a web framework (Framework). See websites using Flask ↓
How Tech Stack Detector detects Flask
Flask is matched from these signals during a single, ordinary page request. Each one contributes to the confidence score shown on a scan.
- HeaderWerkzeug dev server (Flask)
Detecting Flask also implies Python.
Websites using Flask
No websites in our public index are known to use Flask yet. Scan a site above that uses it to be the first. Your result becomes a shareable /site/… page.
Alternatives to Flask
Other Framework technologies Tech Stack Detector detects: popular alternatives and related tools, most-detected first.
Compare Flask
Side-by-side comparisons of Flask with other Framework technologies.
Popular technologies
The technologies most often detected across all websites scanned on Tech Stack Detector.
Frequently asked questions
What is Flask?
Flask is a web framework: Lightweight Python web framework. Tech Stack Detector identifies Flask on any website by analysing HTTP response headers. Its official website is https://flask.palletsprojects.com.
How can I tell if a website uses Flask?
Enter any URL into Tech Stack Detector and it reports whether Flask is present, with a confidence score and the exact evidence it matched. Detection is based on HTTP response headers. No login or crawling of the site is required.
What does detecting Flask imply?
When Flask is detected, Tech Stack Detector also infers Python, because Flask is built on top of it.
What are some alternatives to Flask?
Other Framework technologies Tech Stack Detector detects include React, Next.js, Laravel, Astro, Vue.js and Nuxt. You can compare any of them side by side with Flask.
Data last updated October 20, 2026 · based on 618 recently scanned websites.