2 Added another suggestion
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I know there are already a lot of answers here, but one that isn't mentioned is the Chess24 app. I really like the tactics trainer from the app and find that for the money it is a better value than others I've seen. (Should still be $20 for 1yr of unlimited tactics.) There are also great apps for iOS at least that allow you to read chess books and follow along with a chessboard like Forward Chess or e+books Chess. I have found this to be incredibly helpful in studying.

I know there are already a lot of answers here, but one that isn't mentioned is the Chess24 app. I really like the tactics trainer from the app and find that for the money it is a better value than others I've seen. (Should still be $20 for 1yr of unlimited tactics.)

I know there are already a lot of answers here, but one that isn't mentioned is the Chess24 app. I really like the tactics trainer from the app and find that for the money it is a better value than others I've seen. (Should still be $20 for 1yr of unlimited tactics.) There are also great apps for iOS at least that allow you to read chess books and follow along with a chessboard like Forward Chess or e+books Chess. I have found this to be incredibly helpful in studying.

1
source | link

I know there are already a lot of answers here, but one that isn't mentioned is the Chess24 app. I really like the tactics trainer from the app and find that for the money it is a better value than others I've seen. (Should still be $20 for 1yr of unlimited tactics.)