Question 1

How many companies use ExtJS vs Four?

Accepted Answer

25,853 companies use ExtJS and 3,356 companies use Four in our database. ExtJS is more widely adopted with 7.7x more companies than Four.

Question 2

What percentage of ExtJS users also use Four?

Accepted Answer

13% of companies using ExtJS also use Four (3,350 companies). This overlap suggests the tools serve complementary rather than competing purposes.

Question 3

Which industries prefer ExtJS over Four?

Accepted Answer

The top industries using ExtJS are Other, Media & Content, E-commerce & Retail, Professional Services, Hospitality & Travel. For Four, the top industries are Other, Media & Content, E-commerce & Retail, Professional Services, Education & Learning.

Question 4

Can I get a list of companies using both ExtJS and Four?

Accepted Answer

Yes. AgentData tracks 3,350 companies that use both ExtJS and Four. Sign up free to access the full list with emails, tech stacks, and contacts via CSV or API.

	ExtJS	Four
Companies	25,853	3,356
Category	JS Framework	Payment
Emails available	169,663	36,866
Overlap	13% of ExtJS users also use Four (3,350 companies)

ExtJS vs Four

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Company adoption

Top industries

Top companies using ExtJS

Top companies using Four

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