GuiO's Ear Training -beginner- (free) app for iPhone and iPad

GuiO’s ear training (free) was modified to suit the smartphone an ‘ear training for
a step-by-step practice’ published in Korea.

Exercises are presented as follows:
    Melody 1: 20 exercises such as interval, key signatures, various
scale formations
    Melody 2: 25 exercises such as rhythm.

- How to exercises
1. A blank staff, a pencil, an eraser ready.
2. Write a clef, a time signature, a key signature, the first note of
the exercise presented in the app on the staff in advance.
3. Listen and repeat. Write the notes on the staff.
4. Check the correct answer.

Raise your ear training ability through adequate practice.

** The paid version offers more than 400 examples.