What Iconify does
Iconify is an open source project, operated by Iconify OÜ, that provides access to open source icon sets through one framework. Its documentation covers icons and icon sets, usage instructions, libraries for developers, and the Iconify API. Icons can be browsed at a separate site, icon-sets.iconify.design. The page appears aimed at developers who want to use icons in their projects. Most of the project uses the MIT license, while some older packages use Apache 2.0 or GPL 2.0, and each icon set is licensed separately. The page states no pricing model, but it offers a sponsorship page and a support page.
How Iconify compares with its closest alternatives
All 5 closest alternatives have a free plan, as Iconify does. 3 of the 5 offer an API, as Iconify does. Iconify offers a web app. Of the alternatives, all 5 offer a web app. Iconify was founded in 2020; the alternatives were founded between 1998 and 2021, 3 of them earlier.