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Websites using Bootstrap 4.2.1

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Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

Lead List Exporter

9.9k live Bootstrap 4.2.1 sites, ready to export.

That's how many Bootstrap 4.2.1 websites are in VersionDB right now, each with its full tech stack, contact details, and social profiles.

Pick a ready-made template, or build your own filters in the Lead List Exporter and pay only for the rows you export.

Open the Lead List Exporter

Just need a few domains? Export up to 10 free from a subset of our crawl.

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Bootstrap 4.2.1 companies in the United States

Every Bootstrap 4.2.1 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 Bootstrap 4.2.1 sites by traffic

Start with the highest-traffic end of the dataset.

Sites on a .com domain

Limit results to Bootstrap 4.2.1 websites on .com domains.

Companies with phone numbers

Only sites where an organisation phone number was found.

Create your own
Live Websites

Websites Using Bootstrap 4.2.1

A sample of live Bootstrap 4.2.1 sites from our latest crawl, with the other technologies each one runs.

Open in the Lead List Exporter
DomainAlso runsCrawl Date
lifeandsea.com
jQueryNginxHSTSGoogle Tag ManagerreCAPTCHA
September 27, 2026
iswmpune.in
jQueryHSTSCloudflarecdnjsjsDelivr
September 27, 2026
fst-udc.org
Nginx
September 27, 2026
farmaciasrpfarma.cl
jQueryPHPApache HTTP ServerGoogle AnalyticsGoogle Tag Manager
September 27, 2026
calcal.net
jQueryNginxCloudflarecdnjsjQuery CDN
September 27, 2026
tnhistoryforkids.org
jQueryPHPMySQLWordPressApache HTTP Server
September 27, 2026
bimbico.edu.gh
jQueryNginxjsDelivrjQuery CDNPopper
September 27, 2026
anti-vulcan.ru
jQueryjQuery CDNBootstrapCDNDDoS-Guard
September 27, 2026
viajesflosan.com
jQueryApache HTTP ServerCloudflareGoogle AnalyticsGoogle Tag Manager
September 27, 2026
da-zhong888.com.tw
jQueryPHPHTTP/3CloudflareGoogle Analytics
September 27, 2026

How many websites use Bootstrap 4.2.1?

We found Bootstrap 4.2.1 on 9,900 websites in our September 2026 crawl, across 124 countries.

Which countries use Bootstrap 4.2.1 the most?

By number of websites, the top countries are United States (19%, 1,854 sites), Japan (9%, 912 sites), Netherlands (5%, 505 sites), Germany (5%, 500 sites) and United Kingdom (4%, 406 sites). Together they account for 42% of the 9,900 Bootstrap 4.2.1 sites we track. 37% of the sites are in English, and .com is the most used domain ending, on 41% of them.

Where are Bootstrap 4.2.1 websites hosted?

The networks carrying the most Bootstrap 4.2.1 sites are Amazon.com, Inc. (1,230 sites), Cloudflare, Inc. (1,122 sites) and FiberState, LLC (325 sites).

What technologies are used with Bootstrap 4.2.1?

Across the 9,900 Bootstrap 4.2.1 sites we track, the technologies most often found alongside it are jQuery (95%, 9,437 sites), Cloudflare (70%, 6,894 sites), cdnjs (65%, 6,456 sites), BootstrapCDN (63%, 6,272 sites) and Popper (63%, 6,267 sites).

Deep Dive

Breakdown of Bootstrap 4.2.1 websites

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

FAQ

Answers drawn from our latest crawl of Bootstrap 4.2.1 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.