SYNC Assistant For Neppan is an add-on tool for the Chrome browser, developed by shinichi.katsumata. This tool serves as a liaison between the site controller "Neppan" and external websites. It detects inventory adjustments made on Neppan and notifies the designated sites about the updated inventory information, including remaining room numbers and sales status.

When inventory adjustments are made on the Neppan management site, this assistant notifies the designated sites about the changes in inventory (remaining room numbers and sales flag). It ensures that it does not read or write to cookies or WebStorage. Please note that this extension is designed not to function outside of Neppan's inventory adjustment screen.