Yahoo Daily Fantasy Sharp Tools is a Chrome add-on developed by 12s. It is a free tool designed to provide additional features for Yahoo Daily Fantasy players. The add-on offers two main advantages for players.

Firstly, it provides a feature for calculating and ordering how populated the contests are. This can be useful for players who want to join contests with a specific level of competition or want to avoid contests that are already too crowded.

Secondly, the add-on allows players to automatically join favorable contests at the last possible minute. This feature can be handy for players who want to maximize their chances of winning by entering contests with fewer participants.

To use the add-on, simply navigate to the Yahoo Daily Fantasy Lobby page with the contests showing and single click the blue button labeled "Refresh Contests". To join contests, you must first have a lineup saved, and the add-on uses the Saved Lineup Index to refer to the lineup list from the enter contest page. Once you have selected the contests you want to enter by checking the box next to them, you can double click the red button labeled "Enter Contests" to join them. It is important to use this feature with caution as the add-on joins checked contests at a rate of about 2 per second.