LeetPrep is a free Chrome add-on designed to assist developers in preparing for technical interviews. It offers a comprehensive set of resources, including documentation for popular programming languages like Python and Java, which provides references to built-in functions and data structures, complete with examples. Additionally, LeetPrep includes Big O complexity tables and charts to help users understand data structures and sorting algorithms effectively.

The tool also features common problem-solving techniques derived from Leetcode patterns, alongside a curated list of popular interview questions known as Blind 75. With its fast and convenient access, LeetPrep allows users to efficiently look up function usage and complexity information directly within their browser, making it a valuable resource for anyone looking to enhance their interview preparation process.