The best alternatives to Tintscope are Swatches, Alembic ⚗️, and Litur. If these 3 options don't work for you, we've listed a few more alternatives below.
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Alembic is a Sketch plugin that extracts a color palette from any layer that contains bitmap data. This works for both images and layers with a Pattern fill.
A color picker app for the real world. Litur helps you find and collect all the colors around you. You can see different color combinations for each color you collect; Complimentary, Analogous, Monochromatic, Triadic and Tetradic. And a generated color palette too.
Cone is a delightful and easy to use color picker and organizer for the real world. Cone also lets you identify PANTONE colors of objects without the need of expensive spectrophotometers or PANTONE Capsure.