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Websites using Flask

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Flask is a Python micro web framework ideal for rapidly constructing web applications, offering minimalism, flexibility, and modularity.

Lead List Exporter

4.7k live Flask sites, ready to export.

That's how many Flask websites are in VersionDB right now, each with its full tech stack, contact details, and social profiles.

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Flask companies in the United States

Every Flask website we detected in the United States.

Companies with personnel emails

Only sites where a personal, company-hosted email was found.

Decision makers on LinkedIn

Sites with at least one personnel LinkedIn profile.

Top 100,000 Flask sites by traffic

Start with the highest-traffic end of the dataset.

Sites on a .com domain

Limit results to Flask websites on .com domains.

Companies with phone numbers

Only sites where an organisation phone number was found.

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Versions

Which Flask versions are most used?

We could read a version number on 100% of Flask sites. Of those, the most common are Flask 0, on 1,878 sites, Flask 3, on 1,379 sites and Flask 2, on 1,152 sites.

39% on v0
Versions detected
4
Sites with a version
4,765
Share of sites by version
v0 39% v3 29% v2 24% v1 7%
Live Websites

Websites Using Flask

A sample of live Flask sites from our latest crawl, with the other technologies each one runs.

Open in the Lead List Exporter
DomainAlso runsCrawl Date
machineland.be
HSTSGoogle AnalyticsGoogle Tag ManagerAmazon Web ServicesPython
September 28, 2026
koningsport.nl
Google Tag ManagerPythonLessPostgreSQLOdoo
September 27, 2026
cmim.org
PythonLessPostgreSQLOdoo
September 27, 2026
i1box.eu
PythonLessPostgreSQLOdoo
September 27, 2026
fsa-chemicals.be
Google Tag ManagerPythonLessPostgreSQLOdoo
September 27, 2026
instantsys.com
jQueryApache HTTP ServerGoogle Tag ManagerjQuery CDNPython
September 27, 2026
mountainlabs.eu
HTTP/3PythonLessPostgreSQLOdoo
September 26, 2026
bcd.ec
Python
September 26, 2026
esconet.fi
HTTP/3Google AnalyticsGoogle Tag ManagerPythonLess
September 26, 2026
aedcloud.al
YouTubePythonLessPostgreSQLOdoo
September 26, 2026

How many websites use Flask?

We found Flask on 4,765 websites in our September 2026 crawl, across 136 countries.

Which countries use Flask the most?

By number of websites, the top countries are United States (15%, 723 sites), France (13%, 604 sites), Germany (9%, 445 sites), Spain (6%, 265 sites) and Belgium (3%, 166 sites). Together they account for 46% of the 4,765 Flask sites we track. 36% of the sites are in English, and .com is the most used domain ending, on 34% of them.

Where are Flask websites hosted?

The networks carrying the most Flask sites are OVH SAS (715 sites), Hetzner Online GmbH (507 sites) and Amazon.com, Inc. (435 sites).

What technologies are used with Flask?

Across the 4,765 Flask sites we track, the technologies most often found alongside it are Python (100%, 4,765 sites), PostgreSQL (80%, 3,796 sites), Less (79%, 3,785 sites), Odoo (79%, 3,785 sites) and Google Analytics (19%, 882 sites).

Deep Dive

Breakdown of Flask websites

What else they run, plus their language, hosting network, domain extension and country.

Same category

Other technologies in Web frameworks

Web frameworks technologies run on 9.4% of the websites we track. Flask ranks #20 of 74, on 0.1% of Web frameworks sites.

All Web frameworks technologies

FAQ

Answers drawn from our latest crawl of Flask websites. Anything else, email us and we will look it up.

Through our own crawl, which checks each site's HTML, scripts and headers rather than relying on self-reported data.