Use your own OpenAI-compatible AI service with an HTTPS endpoint, model ID and device-local API key. AI generation actions stay hidden when the selected model is unsupported or unconfigured, while reading, notes and existing results remain available. Saved explanations and translations retain their service and model information. Services never switch automatically.

Use Folucent in English, Simplified Chinese, Traditional Chinese, Japanese, Korean, French, German or Spanish. Choose separate answer and translation languages from the same eight options, with support checked for your selected Apple AI model. Existing language choices are preserved. Improved handling of unusable model output. Explanations stay focused on the selected passage and better preserve stated facts and genuine uncertainty.

Read, find, and revisit your PDFs with less friction. • Recognize text in scanned pages and keep it available for search. • Search across PDF text, recognized text, highlights, and study notes in your library. • A cleaner bookshelf with fewer repeated titles, in grid and list views. • Revisit saved notes in the review queue and return to their source pages. • Read longer translations in a dedicated view. • Improved reading position recovery, keyboard navigation, two-page reading, and larger-text layouts. • Understand starts with Explain, with Translate beside it and the source collapsed until needed. Ask about this passage appears after an explanation. • Mixed-size PDFs open with a centered page and keep a more consistent zoom between pages. • Look up a selected word with the system dictionary, including phonetic notation when available in your installed dictionaries.