TidBITS:

Black Ink is a Mac-based crossword puzzle app from Red Sweater Software. It gives you access to any crossword puzzle using the Across Lite format (which typically has a .puz extension). The default sources it offers include the Wall Street Journal crossword, Chronicle of Higher Education, New York Times Premium Crossword, and American Values Club.

Black Ink offers many useful features for the crossword aficionado. The first of these is the capability to check the puzzle clue answer either at the letter, word, or puzzle level (look in Solution > Check). The second notably helpful feature is Reveal (Solution > Reveal).

Overall, Black Ink is easy to use and a good fit for any puzzler from beginner to advanced, thanks in large part to its Reveal feature. If you already have a New York Times subscription, it’s a nice way to do the crossword puzzle digitally on your Mac.

My only knock on this is that it is Mac only. I’d love to be able to do these crosswords on my iPad.