Another amazing resource from Bjango that helps you create an expanded color palette right within Sketch app.
“A set of Photoshop, Sketch and Affinity Designer documents that use base colors to generate larger palettes. It’s a bit like an advanced color picker, in the form of a document.
The Color Creator Templates are available for Photoshop, Sketch, and Affinity Designer. They’re free and open source, released under the BSD license…”