Beta version of the web app: https://beta.legendapp.com
In the app you will see a "Use beta version" checkbox in the LegendFile menu to toggle between the beta version and the normal version. You may need to press Alt to open the File menu.
This is the best place to post bug reports and feature requests, where the group can discuss and iterate on ideas in real-time. The beta version is updated up to multiple times per day, and we post updates in the forum.