Bibarud is a free platform with no annoying ads and trackers. We are very transparent and dedicated to providing our users the best experience for free. We keep our website ad and tracking free. But for summaries, the team Bibarud needs to buy books and PDFs that are not available for free. We have to go through the book/PDF/Article to provide a summary. The process is very time consuming and also some books or PDFs can be expensive too. So, as a gesture of your love and support you can donate us $2. The price is fixed. It’s less than a cup of coffee would cost.