Kairon

Kairon is a free ebook reader for Android phones, tablets and compatible Amazon Fire tablets. Import your own EPUB, PDF, TXT, CBZ and audiobook files and read offline, with no account required. Its standout feature is Spoiler Lock: connect a compatible AI provider and ask questions about the book you are reading, while the app limits the AI to the part you have already reached, so you can recap characters and plot without spoilers. Kairon also includes Read Aloud text-to-speech, in-reader translation, and BookSky, an optional social tab built on Bluesky where readers share what they are reading.