There are various things. Firstly, it is a front end of Hive with relatively specific content. Then there are the liquidity pool for wrapped Leo and Eth. There are several applications like hivestats.io and the Leodex, which has lower transfer fees than Hive Engine. They are always adding more functions and applications, as well as a sidechain I think.
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Thanks for the reply, a pity you can't get Leo by commenting as far as I can see.
You can get it from commenting, it is just that Leo stake has to vote on the comments. My stake is delegated to another account that follows mine, but doesn't vote on my comment votes. I will look to change this perhaps so I can reward comments with both.
That would be awesome and greatly appreciated :)