The Bratabase is a user-built index of bra measurements, styles, and fit reviews.
The website has a community where a user can lend and/or receive advice, through fit requests, bra adventures, sizing help , and online and offline recommendations. Bratabase has its own marketplace, where users can sell, swap, and give away bras and swimwear to other users.
In March 2014, Bratabase announced a new website feature called the "Cup Index". The Cup Index is designed to make it easier to determine what size a bra is without needing to convert each company's sizing system.