Data is synced from the Chrome Web Store. View the official store page for the most current information.
Free version is very useful, but the paid version is worth it for the option to save your searches you like to run in Japanese and English. I like that I can open up your favorite search across five the marketplaces at once. I only generally use 4 of the 5 marketplaces, but The option to open all five marketplaces in five different tabs at once has made it worth it for me since I'm always looking for a few specific items. Especially since the searches work best when searching in Japanese.
forces you to log in