What problem does 23andMe DNA Painter Shared cM Tool Button solve?
To check the likely relationships for a 23andMe match you have to convert the shared percentage to centimorgans, open DNA Painter’s Shared cM Tool in another tab, and paste the value in. 23andMe DNA Painter Shared cM Tool Button turns that into a single click by adding a button to each match’s profile that opens DNA Painter with the cM value already filled in.