Muhammad Zamroni

Simple plugin to fight spam in registration form. It show color in box and user must type the name of color. The colors are red, green, blue, yellow, black, white, pink, orange, purple, grey.
Now using generated image to provide color. Bot can’t read this color name. Simple, nice and effective.

matriphe colorspam

Fight spam in registration form using color recognition.

nickforddesign

An add-on for Advanced Custom Fields to allow users to select from a list of color choices. Setting up the field works exactly like setting up a radio button list, the main difference being that the key will also be used to style the element.
This is useful for allowing users to pick from a limited selection of colors, rather than enter an arbitrary hex value or choose from a color picker.
Supports all of the following color formats:
<ul>
<li>hex: #FF0000</li>
<li>rgb: rgb(255,0,0)</li>
<li>rgba: rgba(255,0,0, 1)</li>
<li>hsl: hsl(0,100%,50%)</li>
<li>hsla: hsla(0,100%,50%, 1)</li>
<li>name: red</li>
</ul>
Note: you may also use <code>none</code> to show a transparent swatch with a checkerboard background.
<h3>Compatibility</h3>
This ACF field type is compatible with:
<ul>
<li>ACF 4</li>
<li>ACF 5 (PRO version)</li>
</ul>

ACF Color Swatches

An add-on for Advanced Custom Fields to allow users to select from a list of color choices. Setting up the field works exactly like setting up a radio …

matriphe colorspam vs ACF Color Swatches