2025-05-13 00:00:00 Seller Book (Seller Book) is a sales management application for those who sell using the Flea App. You can comfortably manage daily sales management. Let's get a tool for free sales management without stress! Everyone selling in Mercari, Frill, Rakuma, Yahoo auction, etc. How are you now managed to manage sales? A note in a note? Calculated in Excel? ... No it's a little troublesome⁈ ('Д`)