I've finished my sudoku solver. In the end I used a graphics canvas to display the puzzle and handled the input myself, it was didn't take too long thankfully. I also upped the logic behind it so that for each iteration it filled in all the cells that would have only one possible value and then it works on the cells with the lowest number of candidate values. It also disregards unsolvable sudokus (ones that have an empty cell that has no possible value).

It's available for Windows and OSX which makes me a ultra-cool mac developer. Now I'll have to grow a goatee and wear a beret. Anyway, both on the GDS so download it now! It's got other features too including open/save, copy/paste, different themes (including one with my cat, buttons), and 36 premade sudokus.