tsubotanka is a free Chrome extension developed by mecab. It falls under the category of Browsers and is specifically listed as an Add-ons & Tools subcategory. This extension allows users to calculate the price per tsubo and price per square meter from selected text that contains price and land area. With tsubotanka, users can easily calculate unit prices on real estate websites.

Once installed, tsubotanka adds an option to the context menu whenever text is selected. It automatically extracts the price and land area from the selected text and calculates the unit price. Users can then pin the result anywhere on the page by clicking the left mouse button, making it convenient for comparing multiple real estate options. The pinned result can be deleted by clicking the right mouse button before pinning.

It's important to note that tsubotanka is not limited to specific real estate websites and can be used on any pages as long as the selected text contains both the price in yen (円) and either the area in square meters (m²) or tsubo (坪).

With tsubotanka, users can quickly and easily calculate price per tsubo and price per square meter, making it a valuable tool for real estate research and comparison.