Geist and Geist Mono are licensed under the SIL Open Font License 1.1.
Source: https://github.com/vercel/geist-font

Free for commercial use, no attribution required. Bundled here only
for convenience, in case new text needs to be set in this brand's
typeface elsewhere. The deliverable SVG/PNG logo files in this pack do
NOT depend on these being installed — every wordmark is already
outlined to vector paths.
