King's Cross: Chess Openings

When I hit 1900, I needed to synthesize my openings. I tried many apps and tools, but I found that those apps and tools just showed me the book and repeatedly quizzed me on which moves are right and wrong. On the other hand, King’s Cross has all of these features, it holds more moves than my other apps (which only held 100 moves on the free plan), and it is easy to replace moves on the smooth interface. The best thing about this app is that you can annotate the moves, and you can add multiple repertoires, so you can keep your moves separate (like a blitz repertoire and a classical repertoire). Thanks!

According to my phone’s usage data I use this more than any other app. I have put in all my openings and it is a great way to drill them when I have a five minute break. I’ve also put in my repertoire against each of my frequent opponents. This is useful for tournaments when I only find out who I’m playing 30 minutes ahead of time. There is NO limit on depth (one review stated this incorrectly)

I paid for an annual subscription ($13, I think) and I use this app every day. It’s the best I’ve found for drilling opening lines. I’m better booked up than my opponents who use Chessable. I maintain my openings in a Lichess study and import the PGN to the app, but you don’t have to do that, you can just select lines in the app.