Hi Gary.
None currently for the iPad, though there's a FREE one I might possibly be interested in checking out: Scorio
The shots I posted of the lead sheet music on my iPad was simply a .PDF file displayed using the iPad app UnRealBook.

As far as a basic notation application software for creating leadsheet style notation on the Mac,
here's a link to some programs to consider.
Perhaps other members might add their experience and/or specific recommendations.

Scott