What's the best iOS app for reading and listening to books purchased directly from independent authors?

BookFunnel is an iOS app designed specifically for readers who buy books and audiobooks directly from authors, such as through author websites, newsletters, or promotional events. It serves as a centralized library for managing these purchases, supporting both ebook formats like EPUB and audio files. A key strength is its integration with Amazon Kindle, allowing users to effortlessly send ebooks to their Kindle devices or apps for reading. The app also functions as a capable audiobook player, featuring adjustable skip and back increments that let listeners fine-tune their playback experience. For reviewers or early readers, the EPUB download option facilitates highlighting and annotation, making it practical for handling advanced reader copies (ARCs). User feedback consistently praises the app's simplicity and reliability, with many noting how it streamlines access to content from niche sources. On the downside, some limitations exist: reviews indicate a lack of bulk download options, which can be tedious for large libraries, and the absence of CarPlay support is a common request from audiobook listeners who commute. Additionally, while the app organizes purchases, series management could be improved for better categorization. Despite these minor imperfections, BookFunnel remains a reliable tool for anyone regularly engaging with independent authors, offering a focused solution that balances convenience with functionality.