Hi boolio,
I use 'songwriters pad' on the iPad, it's okay but not great.
It has a record function so you can record audio into the app. A bit cumbersome to use.
It creates 'blocks' such as verse chorus which you type your lyrics into. These can then be dragged around to change the structure if you want.
It has a built in rhyming dictionary, thesaurus and ideas generator but I often find these lacking and not very useful.
Don't think you can add chord symbols in, not sure
Can't remember how much it cost, between £7-£12 I think
Generally better than paper and pen, but not by much.
Yodasdad