https://en.chessbase.com/post/announcing-grand-chessbase-15-...
For those who are looking for chess opening preparation software for free, I recommend just using lichess.org. Considering that lichess is ad-free and run by volunteers only, it is amazing how much it offers (although it's not enough for chess professionals).
* Search any database (proprietary or freely downloaded) for games matching positions (partial position matches too)
* Quiz yourself on openings; e.g. the actual memorization of the move orders, which I don't believe ChessRoots is showing
* Generate endless tactics problems to drill on
* Generate annotations for games; e.g. branching moves, variations, text comments etc.
* Graphical markup of positions, to show tactics like pins, skewers, forks, etc.
* ChessBase gives you a perpetual license. You can upgrade if you think new versions are worth it (they usually aren't). I happily used ChessBase 9 for several years before upgrading to 14.
It's really not a fair comparison. If ChessBase is Photoshop, ChessRoots as it is now is just a simple painting tool. This isn't to say that ChessRoots can't be something worth the price down the road, but for now this is not a great comparison.
Chess.com is also something that I've happily paid for for many years. For $99 a year, you get unlimited tactics training, engine analysis (with Stockfish), and a full license to what used to be called Chess Mentor, in addition to opening specific training.