Needs refinement
Conclusion: Sudoku Grab is better
Why:
OCR feature - this app struggles with scanning capture puzzles. I couldnt figure out if there was a way to change the scan area which I feel is a strength of Sudoku Grab. The app frequently presented me with incomplete grids and even failed to find a puzzle from a screen grab of a puzzle created itself!
Pencil marks - only come in black (SG offers red, blue & green)
Rating algorithm - seems generous - extreme puzzles are not rated as difficult in SG.
Overall design - what is with the font choice?
HFIV about
Sudoku Magic - The Puzzle Game, v2.3