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Technology answer

JSS

320,697

companies run it, 0.59% of 54,527,857 in the index. Landing 12 Sept 2026.

Hosts: 475,547 live hosts run it, of 191,809,695 hosts in the index, 0.25%. A host is a website, not a company.

Companies by month

Companies, monthly, on the fixed panel of sites crawled since 2020of 54,527,857 in the indexlanding 12 Sept 2026

320,697 at Sept 26; 349,902 twelve months earlier, -29,205, -8.3% on the fixed panel; the series starts January 2021 because the panel is anchored at 31 Dec 2020

The 69 numbers in this chart
MonthCompaniesObserved on the panel
2021-0100
2021-0200
2021-0300
2021-0400
2021-0500
2021-0600
2021-0700
2021-0800
2021-0900
2021-1000
2021-1100
2021-1200
2022-0100
2022-0200
2022-0300
2022-0400
2022-0500
2022-0600
2022-0700
2022-0800
2022-0900
2022-1000
2022-1100
2022-1200
2023-0100
2023-0200
2023-0300
2023-0417,888530
2023-0530,501904
2023-0643,1141,277
2023-0755,7261,651
2023-0868,3392,025
2023-0980,9522,398
2023-1093,5642,772
2023-11106,1773,146
2023-12118,7903,520
2024-01131,4023,893
2024-02144,0464,268
2024-03160,8544,766
2024-04176,9125,242
2024-05175,0825,187
2024-06178,5955,291
2024-07182,1005,395
2024-08185,8625,507
2024-09192,7035,709
2024-10212,6796,301
2024-11230,4476,828
2024-12243,7827,223
2025-01258,5967,662
2025-02272,7078,080
2025-03286,7868,497
2025-04297,0788,802
2025-05307,6609,115
2025-06319,2559,459
2025-07330,3679,788
2025-08342,31010,142
2025-09349,90210,367
2025-10354,38010,500
2025-11345,72410,243
2025-12339,27510,052
2026-01337,3109,994
2026-02336,0259,956
2026-03336,0979,958
2026-04335,1559,930
2026-05333,5979,884
2026-06332,3249,846
2026-07329,3069,757
2026-08326,2089,665
2026-09320,6979,502

Both denominators, and a third

Shares of the same 320,697each row a different wholelanding 12 Sept 2026

Denominator
Companies
Share
companies in the index
54,527,857
0.59%
companies running anything in UI Frameworks and Components
20,892,480
1.5%
companies running anything in CSS-in-JS libraries
786,955
40.8%

Three wholes, three shares of one count: a share travels with its whole, never alone. Against the last of them, JSS is rank 2 of 4 technologies in CSS-in-JS libraries.

Open as a segment

320,697 companies; add a country, a sector or a band on the segment page. Counting is free.

/companies/tech-jss

Open the segment

Catalogue record

As recorded in the cataloguetaxonomy release tax-2026.10last discovered 10 Sept 2026

An open-source CSS-in-JS styling library for JavaScript applications.

JSS is an open-source library that generates CSS from JavaScript for styling web applications. It is used by frontend developers to manage scoped styles and theming in JS apps.

Kindlibrary
VendorCSS-in-JS Community, cssinjs.org
Slugjss
Deploymentself-hosted
Pricingfree
Open sourceyes
First discovered2023-10-05
Last discovered2026-09-10
Taxonomy releasetax-2026.10