Marathon Countdown Timer is a free Chrome add-on developed by SOB Construction. This handy tool is designed to help marathon runners stay motivated and track their progress leading up to race day.

With Marathon Countdown Timer, users can select their upcoming race and receive a personalized countdown to keep them focused and motivated. The app also allows users to share a photo with the countdown, either by downloading it or having it sent via text message. This feature is a great way to share your excitement with friends and family, and to visually track your progress as the race day approaches.

Overall, Marathon Countdown Timer is a simple yet effective tool for marathon runners who want to stay motivated and keep track of their training progress. It's easy to use and provides a visual reminder of the upcoming race, making it a valuable addition to any runner's toolkit.