Ink Maps can up your game in tattooing:

Pick / Organize Palettes
Complement Color Schemes
Interactive Digital Color Wheel
Digitally Mix Pigments
Make Stencils
Multi Page Print
Store & Share Palettes / Stencils
Export Palettes to Procreate® or Photoshop
Track Client Info / Details / Appointments
Filter on Skintones

Please note: this is an app which need a subscription in order to function. There is no free version available.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/