O-Pens app for iPhone and iPad

A nail color guide program for nail art, specially designed for color gel mixing pens in red, yellow, blue, black, white base colors and specific color gel polish, by indicating the rotating scale on the color gel mixing pen , controlling the extrusion volume of gel polish so that the base colors or specific colors can be mixed in different proportion to produce a variety of nail colors.

Features:
1. Support two or more base colors gel polish or specific colors mixing guidance.
2. Support the display of the color effect of physical photos, one-click selection of color mixing guidance.
3. Support code identification of different base colors combination and independent color mixing interface guidance.
4. Support the choice of the number of nails that can be applied with the color gel.
5. Support multi-language selection and online tutorial.