カードチェッカー is a free Chrome add-on developed by yasuna specifically for Final Fantasy 14 players. This add-on only works on the Lodestone page of Final Fantasy 14 and provides a convenient feature for Triple Triad players.

The main purpose of カードチェッカー is to add a "CSV Download" button to the user's Triple Triad page. When clicked, this button allows the user to download a CSV file containing a list of their cards. This feature is especially useful for players who want to keep track of their card collection or organize their cards in spreadsheets.

To utilize カードチェッカー, users can simply copy the table of card data from the "Learning" page of the FC "Ultima Spirits" and paste it into an Excel file. This add-on then enables easy access to the CSV download feature, making it a convenient tool for Final Fantasy 14 Triple Triad enthusiasts.

Please note that カードチェッカー is only compatible with the Chrome browser and can only be used on the Lodestone page of Final Fantasy 14.