Tosefta is a e-book reader where the page by page commentary -- from cultural to literary to scientific -- is right at your fingertips.
Obtain your API key from ChatGPT and paste it into Preferences.
Import the book in ePub format into Tosefta library.
Open the book. As you read, tap on the screen to bring up the commentary view. Double tap on the view to fetch the commentary from ChatGPT.
Text selection enables the Explain function. Tap on the Explain tab to get the explanation by ChatGPT. Text selection works better with the page swiping disabled.