Dmitry Mayorov

With this plugin you can safely change your theme without worrying to loose the code you’ve added.

Insert Code Lite

Insert Code Lite lets you add scripts, styles, and other custom code to your website.

wiredmindshelp

This Plugin will provide a Tracking-Code for LeadLab (powered by WiredMinds). The code will be placed in front of the closed body tag to each page rendered by WordPress. 
The User has only to use his customer number in the plugin configuration.

LeadLab by wiredminds

Works well

Integration of the Wiredminds LeadLab trackingcode.

Insert Code Lite vs LeadLab by wiredminds