A Useful iPhone App for Modelers is …

[SpaceRanger]

… Color Query Pro. You can:

- Use camera to capture color from object.
- Query color and compare to twelve standard palettes;:
- Pantone
- RAL Classic
- HKS K
- NCS
- Sherwin-Williams
- BEHR
- Valspar
- 日本の色の一覧 Colors of Japan
- Federal Standard 595
- HTML
- Material Design
- Wikipedia.
- Query color by number or name.
- Mix and match color in RGB, HSB or CMYK colorspaces.
- Use sliders to adjust color.
- Get RGB with #hex, HSB and CMYK numbers. Enter #hex code directly to see a color.
- Save up to 25 color samples over five sample palettes. Rotate through the palettes with the toggle button.

On top of all that, it's free! From the App Store.

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.