As the name suggests, JustSudoku's focus is on generating and solving Sudoku puzzles, not on levels or award points. JustSudoku is also "just" because all puzzles, while hard can be solved without guessing using JustSudoku's straight forward logic.

Puzzles can be captured using the phone's camera or from photographs. New puzzles can be generated with no symmetry, two-way symmetry or four-way symmetry.

JustSudoku includes erase, undo, next, hint, check, and solve buttons. It also supports notes with a notes button to toggle between normal and note entries.