Leetcoder is a Chrome extension developed by Qiquan Lu that provides an in-page timer for solving Leetcode problems. This handy tool allows users to keep track of their time while working on Leetcode coding challenges.

The extension offers various features including timer start, pause, and auto start options. Users also have the ability to send their time records to an API endpoint of their choice. This allows for easy tracking and analysis of coding progress.

One of the standout features of Leetcoder is its flexibility. Even if users do not have their own API server, they can still utilize the extension by using the provided sample using Google Sheet and Google Apps Script. This open-source project also encourages user contribution through stars and pull requests on GitHub.

With Leetcoder, users can enhance their Leetcode coding experience by effectively managing their time and monitoring their progress.