Knitrr is an online digital arena and a database where designers can sell optimized interactive patterns. They are seamlessly linked to tutorials, filtered to size, and connected to all suitable yarn alternatives - available to buy right there and then so that the knitters can find everything they need in one place. Learning resourses are available through LEARNknit for the advancement of craftsmanship, and the preservation of future cultural heritage. By incentivizing pattern designers for pointing out yarn alternatives and thereby contributing to the sale of yarn, the pattern designers will have a higher sales momentum, which enables more pattern designers to make a living out of their designs.