I'm also not a fan of lichess's puzzles, especially on mobile. Over the years I've been bitten for weeks at a time by a bug that fetches a batch of puzzles at

I'm also not a fan of lichess's puzzles, especially on mobile. Over the years I've been bitten for weeks at a time by a bug that fetches a batch of puzzles at a time on mobile, and then loops through those 50 puzzles repeatedly instead of fetching more. Even when not bugged, this behavior of 'fetch N puzzles at once' heavily encourages rating ping pong, you get a batch of easy puzzles, get them all right so your rating jumps more than it should, then a batch of hard puzzles and get crushed. I found I only ever progressed on lichess after grinding meaningful improvement slowly on chess.com, then coming back to lichess to 'catch up my rating'. I also quite like Chess.com's Puzzle Rush.