Checkbox controls provide a simple true/false choice to the user.

If a checkbox is not what you’re after visually, you can also use a Switch or a Toggle. Technically speaking, they are both checkboxes as well, so you use them the exact same way. Their only difference is the way they look.

Example

new \Kirki\Field\Checkbox(
	[
		'settings'    => 'checkbox_setting',
		'label'       => esc_html__( 'Checkbox Control', 'kirki' ),
		'description' => esc_html__( 'Description', 'kirki' ),
		'section'     => 'section_id',
		'default'     => true,
	]
);

Usage

<?php if ( true == get_theme_mod( 'checkbox_setting', true ) ) : ?>
	<p>Checkbox is checked</p>
<?php else : ?>
	<p>Checkbox is unchecked</p>
<?php endif; ?>

Adding a class to a div if the checkbox is checked:

<?php $value = get_theme_mod( 'checkbox_setting', true ); ?>
<div class="<?php echo ( $value ) ? 'checkbox-on' : 'checkbox-off'; ?>">
	If the checkbox is checked, the class will have a class "checkbox-on".
	If the checkbox is unchecked, the class will have a class "checkbox-off".
</div>