Hayfever is a Google Chrome extension designed to simplify time tracking with the Harvest service. As a Harvest timesheet manager, Hayfever allows users to easily manage, start, and stop timers that sync directly with their Harvest account through the Time Tracking API. With the Hayfever icon, users can see a badge displaying the total number of hours logged for the day.

Created by web developer Mike Green, Hayfever was born out of the need for accurate time tracking. Green's personal experience of forgetting to log hours on Harvest inspired him to develop this extension. Hayfever has become an essential tool for him and he hopes that others will find it just as useful.

Hayfever is Open Source Software, released under the GNU General Public License v2. Users can obtain the source code from the project's GitHub repository. The extension also features art and design contributions by Steve Guberman and Gillian Deak of Fifth Room Creative. Hayfever utilizes the Silk icon set from famfamfam.

Please note that for bug reports or feature suggestions, users are advised to submit a ticket on the project's GitHub page. Additionally, if users appreciate Hayfever and would like to support its development, they can consider buying the developer a cup of coffee through the provided Pledgie campaign.