Slack勤怠 is a Chrome add-on that allows users to easily submit their attendance on Slack with just one click. This program eliminates the need for WebhookURL, bot creation, or administrator privileges.

With Slack勤怠, users can effortlessly post their attendance to a specified channel. Simply register the channel URL, the message for clocking in, and the message for clocking out. Since the add-on operates with user permissions, there is no requirement for WebhookURL, bot creation, or administrator privileges.

To obtain the channel URL, right-click on the channel name, select "More Options," and then choose "Copy Link."

Update v0.2: This version of Slack勤怠 addresses the issue of failed posts when there is a period without access to Slack.