Sparkle. Greypaint uses Sparkle 2.9.6 for signed updates to Greypaint itself. Sparkle is distributed under the MIT License. The bundled BinaryDelta tool is part of Sparkle and is covered by the same project license. Read the Sparkle license.
Homebrew. Greypaint can query and invoke the Homebrew installation already present on your Mac for cask updates. Homebrew is not bundled with Greypaint; its own license applies. Read the Homebrew license.
Archivo. Greypaint bundles the Archivo typeface by Omnibus-Type, distributed under the SIL Open Font License 1.1. Read the Archivo license.
Greypaint also uses Apple system frameworks, including SwiftUI, AppKit, UserNotifications, and ServiceManagement. Those frameworks are provided by macOS and are not redistributed by Greypaint.
Last updated: September 11, 2026.