I built a simple book tracker because I kept buying books I owned

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I'm Maureen, a senior and self-taught developer. I love browsing second-hand book markets but kept coming home with books I already owned.I couldn't find a simple enough app to track my library — everything required an account, had ads, or pushed a subscription. So I built one myself.SeniorEase Library (Android): scan an ISBN, book is added instantly. No account, no ads, one-time €2.99. First 10 books free.Would love any feedback!