CodyChat is generally respected for being a lightweight, AJAX-based chat script that feels snappy compared to heavier competitors like CometChat. Version 90 specifically introduced UI modernizations that made it look less like a relic from the early 2000s and more like a modern messenger.
Here are a few concerns:
A "nulled" script is a paid software that has been hacked or modified to remove the license verification. Using nulled software is illegal, violates copyright, and poses significant security risks (such as backdoors, malware, and data theft).