Corona Vaccine Booking Highlighter

Corona Vaccine Booking Highlighter is a simple browser tool built for Japan's corona vaccine reservation sites on the *.v-yoyaku.jp domain. Instead of scanning crowded calendars day by day, it automatically highlights the dates that actually have open slots.

This makes it much easier to see at a glance when vaccinations are available, so you can quickly identify and book an open appointment without missing it. If you have been refreshing booking pages over and over, this tool helps you spot openings faster and secure your slot sooner.