Nextep app for iPhone and iPad

Based on the four-quadrant theory from The 7 Habits of Highly Effective People, Nextep classifies todos by importance and urgency.
Therere 4 categories: 1. both important and urgent 2. important but not urgent 3. Urgent but not important 4. Not important nor urgent.
Nextep support Lock function to avoid private items being peeked.
Nextep uses different colors to represent different important levels. You can tell the difference of todos according to their colors.
Nextep support multi-way filters. You can filter todos according to time period (today/this week/this month/all), importance level and progress (done/undone/doing).
Nextep is quite easy to operate. Just by sliding, you can adjust the progress, delete or undo the todo.