Stack Lookup
Get a free key

Technology answer

Polyfill

75,187

companies run it, 0.14% of 54,527,857 in the index. Landing 12 Sept 2026.

Hosts: 1,123,359 live hosts run it, of 191,809,695 hosts in the index, 0.59%. 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

75,186 at Sept 26; 82,457 twelve months earlier, -7,271, -8.8% 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
2021-01255,89573,992
2021-02255,89773,993
2021-03255,89873,993
2021-04255,90073,994
2021-05255,90273,994
2021-06255,90373,995
2021-07255,91473,998
2021-08256,04774,036
2021-09256,13374,061
2021-10256,20974,083
2021-11256,29474,108
2021-12256,40374,139
2022-01256,49574,166
2022-02256,58774,193
2022-03256,69974,225
2022-04256,80274,255
2022-05256,90574,284
2022-06257,01274,315
2022-07257,11774,346
2022-08257,21374,374
2022-09257,22474,377
2022-10257,26674,389
2022-11257,31674,403
2022-12257,35874,415
2023-01257,38874,424
2023-02257,43374,437
2023-03257,47874,450
2023-04306,09588,508
2023-05292,16484,480
2023-06278,23280,451
2023-07264,29676,422
2023-08250,36372,393
2023-09236,42968,364
2023-10222,45964,324
2023-11208,50660,290
2023-12194,55356,255
2024-01180,60052,221
2024-02166,63448,182
2024-03152,85844,199
2024-04138,97240,184
2024-0576,49422,118
2024-0676,57422,141
2024-0776,65422,165
2024-0876,74322,190
2024-0977,05222,280
2024-1077,73322,477
2024-1178,37322,662
2024-1278,96622,833
2025-0179,64323,029
2025-0280,20323,191
2025-0380,76223,352
2025-0481,16123,468
2025-0581,53423,576
2025-0681,93223,691
2025-0782,29023,794
2025-0882,62423,891
2025-0982,45723,843
2025-1082,06623,730
2025-1181,30423,509
2025-1280,58323,301
2026-0179,91123,106
2026-0279,17122,892
2026-0378,55822,715
2026-0478,15322,598
2026-0577,63922,449
2026-0677,20122,323
2026-0776,63122,158
2026-0875,97921,969
2026-0975,18621,740

Both denominators, and a third

Shares of the same 75,187each row a different wholelanding 12 Sept 2026

Denominator
Companies
Share
companies in the index
54,527,857
0.14%
companies running anything in JavaScript Libraries
40,118,208
0.19%
companies running anything in Polyfills and loaders
16,428,598
0.46%

Three wholes, three shares of one count: a share travels with its whole, never alone. Against the last of them, Polyfill is rank 4 of 14 technologies in Polyfills and loaders.

Open as a segment

75,187 companies; add a country, a sector or a band on the segment page. Counting is free.

/companies/tech-polyfill

Open the segment

Catalogue record

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

JavaScript polyfill library/service that adds missing browser features.

Polyfill provides JavaScript polyfills that emulate modern web platform features in older browsers, with a hosted service and an open-source library. It originated as the Polyfill.io project used by developers to ensure cross‑browser compatibility.

Kindlibrary
VendorPolyfill.io Project, polyfill.io
Slugpolyfill
Deploymentself-hosted
Pricingfree
Open sourceyes
First discovered2019-10-04
Last discovered2026-09-10
Taxonomy releasetax-2026.10