LEARNING NOTES
The best app for learning to read notes is Notes! (iPhone/iPad). Here are the settings (to toggle between Treble and Bass clef, tap on the clef):
Select notes to practice (notes in C Position shown; add new notes as needed):
Select from the top what to practice: Keys, Letters, or Keys + Letters (shown)
Turn OFF the trophies' pop-up (it's baby stuff and wastes time):
Other modes of practicing (notes in spaces, notes on lines, notes in spaces + lines):
Finding Middle C, Sharps and Flats: