AddSearch is an instant search for websites that gives results immediately and is very easy to install. Implementing the AddSearch instant search onto your Drupal site can be done by following these instructions.
How to Install AddSearch onto a Drupal Site
First, find your Site key by following these instructions:
Use our Search Designer tool to configure the widget according to your needs and copy the installation script. Then paste the script into your website template where you would like the AddSearch field to appear. Here is an example of what the script snippet might look like: