Advantages: free, free, free, with nearly unlimited cloud library space. Software supports multi-platform synchronization, and you won't find a product that covers more platforms than this. One-click export of highlighted content or annotations is much simpler than WeChat Reading. (Just try exporting annotations from 100 books in WeChat Reading to see how troublesome it is. Amazon has a lot of solutions.) It cannot accurately display how many minutes you've read, but there are reading goal rewards, such as weekly goals, monthly goals, yearly goals, and quarterly goals, which, when achieved, reward you with beautiful electronic bookmark images, much more thoughtful than the reading statistics in WeChat Reading. How is this achieved?