Could be a PhoneGap app, although it could easily start as a simple responsive web app that renders nicely on tables and iPads.
Initial Scope:
- Configurable character sheet with
- character name
- class & level
- Background
- Player Name
- Race
- Alignment
- Experience Points
- standard attributes (strength, dexterity, constitution, intelligence, wisdom, charisma)
- armor class
- initiative
- hit points
- hit dice
- death saves
- attacks & spellcasting
- equipment, including independent fields for CP, SP, GP, etc
- features & traits