Only My Songs is going live in late July 2024. I'm going to tinker with it once it's up and write a phone friendly interface.
Presently the actual lyrics/chords editor is very basic. Essentially its just text editing a fixed width file. I'd love to vastly improve this along with the ability to edit directly as you are viewing your song also. Can't wait.
I don't use tabs myself so I haven't even looked in to their needs. Hopefully I can involve some other parties that know what's required and add in support for using guitar tabs.
I'm looking forward to making little piano pictures for chords too.
See if this site gets any real interest before worring about getting some kind of return. Maybe just make it donation based.
Keeping an open mind about how to possibly link this in with audio and maybe even video files. It has the 'links' option so kind of has it already in a way.