diff --git a/README.md b/README.md
index 5033f1a..498f2e7 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,11 @@ $field
     ->setConfig('default_value', 'green-500')
     ->setConfig('allowed_colors', ['green-500', 'blue-500'])
     ->setConfig('exclude_colors', ['green-50', 'green-100'])
+    ->setConfig('custom_colors', [
+      'name' => 'Magenta',
+      'slug' => 'magenta',
+      'color' => '#ff00ff',
+    ]);
     ->setConfig('return_format', 'slug');
 ```
 
diff --git a/src/Concerns/Palette.php b/src/Concerns/Palette.php
index a296b86..3b8ea5b 100644
--- a/src/Concerns/Palette.php
+++ b/src/Concerns/Palette.php
@@ -10,7 +10,7 @@ trait Palette
      * @param  string  $color
      * @return string[]
      */
-    public function palette($color = null)
+    public function palette($color = null, $custom_colors = [])
     {
         $colors = [];
         $themeJson = [];
@@ -31,6 +31,10 @@ public function palette($color = null)
             return $color ?: $colors;
         }
 
+        if (! empty($custom_colors)) {
+            $palette = $this->sanitize_custom_colors($custom_colors);
+        }
+
         foreach ($palette as $value) {
             if (empty($value['slug'])) {
                 continue;
@@ -48,4 +52,19 @@ public function palette($color = null)
             $colors[$color] ?? null
         ) : $colors;
     }
+
+    public function sanitize_custom_colors($customColors = [])
+    {
+        if (! is_array($customColors)) {
+            return [];
+        }
+
+        return array_map(function ($color) {
+            if (empty($color['slug'])) {
+                $color['slug'] = sanitize_title($color['name']);
+            }
+
+            return $color;
+        }, $customColors);
+    }
 }
diff --git a/src/Field.php b/src/Field.php
index 8f9209c..e142dc9 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -16,6 +16,7 @@ class Field extends \acf_field
         'default_value' => null,
         'allowed_colors' => [],
         'exclude_colors' => [],
+        'custom_colors' => [],
         'return_format' => 'slug',
     ];
 
@@ -59,6 +60,10 @@ public function render_field($field)
             });
         }
 
+        if (! empty($customColors = $field['custom_colors']) && is_array($customColors)) {
+            $palette = $this->sanitize_custom_colors($customColors);
+        }
+
         if (empty($palette)) {
             echo __('There are no colors available.', 'acf-editor-palette');
 
@@ -192,6 +197,36 @@ public function render_field_settings($field)
             'choices' => $colors,
         ]);
 
+        acf_render_field_setting($field, [
+            'label' => __('Custom Colors', 'acf-editor-palette'),
+            'name' => 'custom_colors',
+            'instructions' => __('Add custom colors to the palette.', 'acf-editor-palette'),
+            'type' => 'repeater',
+            'button_label' => __('Add Color', 'acf-editor-palette'),
+            'sub_fields' => [
+                [
+                    'label' => __('Name', 'acf-editor-palette'),
+                    'name' => 'name',
+                    '_name' => 'name',
+                    'key' => 'name',
+                    'type' => 'text',
+                    'required' => true,
+                    'instructions' => 'The name of the color.',
+                    'wrapper' => ['width' => '', 'class' => '', 'id' => ''],
+                ],
+                [
+                    'label' => __('Color', 'acf-editor-palette'),
+                    'name' => 'color',
+                    '_name' => 'color',
+                    'key' => 'color',
+                    'type' => 'color_picker',
+                    'required' => true,
+                    'instructions' => 'The color value.',
+                    'wrapper' => ['width' => '', 'class' => '', 'id' => ''],
+                ],
+            ],
+        ]);
+
         acf_render_field_setting($field, [
             'label' => __('Return Format', 'acf-editor-palette'),
             'name' => 'return_format',
@@ -222,7 +257,7 @@ public function format_value($value, $post_id, $field)
         $format = $field['return_format'] ?? $this->defaults['return_format'];
 
         if (! empty($value) && is_string($value)) {
-            $value = $this->palette($value);
+            $value = $this->palette($value, $field['custom_colors']);
         }
 
         return $format === 'array' ? $value : ($value[$format] ?? $value);
@@ -243,7 +278,7 @@ public function validate_value($valid, $value, $field, $input)
         if (
             $valid &&
             ! empty($value) &&
-            empty($this->palette($value))
+            empty($this->palette($value, $field['custom_colors']))
         ) {
             return __('The current color does not exist in the editor palette.', 'acf-editor-palette');
         }
@@ -267,7 +302,7 @@ public function update_value($value, $post_id, $field)
 
         $value = is_string($value) ? $value : $value['slug'];
 
-        return $this->palette($value);
+        return $this->palette($value, $field['custom_colors']);
     }
 
     /**