Rainbow Tables are really useful when cracking password hashes, but one major disadvantage of these tables is their size which can be hundreds of gigs for complex tables. The author thought it would be extremely useful to have a personal web interface for your rainbow tables which you can access from anywhere on the web anywhere without having to carry the large tables with you everywhere. Wophcrack was designed to work on Backtrack 4 R2, although it can be install on any Linux distribution with some small adjustments.
Source: https://thehackernews.com/2011/03/wophcrack-web-based-interface-for.html