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Need feedback on my new chess web tool - Personalized Puzzle Builder

I built a personalized puzzle builder for chess.com and lichess users which designs and builds personalized puzzles from your blunder history while building I doubted if it would help but it did help to grow my chess.com account rating faster and reach 2000 milestone. But to make this an exclusive, permanent and standalone web app I need proof of usefulness from other chess players like you guys here is the link for MVP: https://chess-puzzle-builder.vercel.app/ and below are some of the screenshots of it I tried to make UI as much simple and easy to understand as possible. Respectful feedback is appreciated. Thank.
IMG_20261016_193639.jpg
IMG_20261016_193444.jpg
IMG_20261016_193730.jpg
IMG_20261016_193610.jpg

I built a personalized puzzle builder for chess.com and lichess users which designs and builds personalized puzzles from your blunder history while building I doubted if it would help but it did help to grow my chess.com account rating faster and reach 2000 milestone. But to make this an exclusive, permanent and standalone web app I need proof of usefulness from other chess players like you guys here is the link for MVP: https://chess-puzzle-builder.vercel.app/ and below are some of the screenshots of it I tried to make UI as much simple and easy to understand as possible. Respectful feedback is appreciated. Thank. ![IMG_20261016_193639.jpg](https://image.lichess1.org/display?fmt=webp&h=0&op=resize&path=yFeUULbv5XQF.jpg&w=864&sig=eaf0d721140a3603710001c3e96da8a2083f6009) ![IMG_20261016_193444.jpg](https://image.lichess1.org/display?fmt=webp&h=0&op=resize&path=h98eR7RB0XEv.jpg&w=864&sig=e88ce1aaad0f3e47ec461d3ba8ac96c6fcd17d65) ![IMG_20261016_193730.jpg](https://image.lichess1.org/display?fmt=webp&h=0&op=resize&path=k2ubcVnfQX2h.jpg&w=864&sig=7dbe952acd80d6676e5f5f30abe5d952c647513c) ![IMG_20261016_193610.jpg](https://image.lichess1.org/display?fmt=webp&h=0&op=resize&path=BnRvKwnS1XS2.jpg&w=864&sig=71ab458a43cf5912304e00d66ecd85f493f55386)