Check If Caldera Form is Active or Not

check-if-caldera-forms-is-active.php

<?php
/**
* function to Check if Caldera Forms is active
*/
function is_caldera_form_active(){
      if (!function_exists('is_plugin_active')) {
            include_once(ABSPATH . 'wp-admin/includes/plugin.php');

        }
        if (is_plugin_active('caldera-forms/caldera-core.php') || defined('CFCORE_VER')) {
            return true;
        }
        return false;
}

load-after-caldera-forms.php

<?php
add_action( 'caldera_forms_includes_complete', 'my_addon_init' );
function my_addon_init(){
  //start your Caldera Form add-on code here, since Caldera Forms is loaded and Caldera Forms Autoloader is inititialized 
}