Acorn 8.6 introduces a major update with a rewritten brushing engine utilizing Metal shaders that enables smoother, velocity-sensitive brush strokes, and improved blending. It also adds a new command-line shell tool for sending JavaScript commands and starting an MCP server to integrate with large language models, while large machine learning models used for AI features are now downloaded on demand, reducing app size. Additional improvements and bug fixes are detailed in the release notes.
http://flyingmeat.com/blog/archives/2026/6/acorn_8.6_brushes.html