The Knowledge Press

The Knowledge Press is a library of 261 public-domain books and four diaries that you can search and question, entirely on your device. Ask it anything: what Marcus Aurelius says about anger, how Darwin describes the Galapagos finches, where Pepys was on the day of the Great Fire. The app searches the whole library two ways at once, by meaning and by exact wording, and answers from the passages it found. Every answer shows its sources, and marks which passages the model actually read. WORKS OFFLINE The books, the search index and the language model are all on the device. Nothing you ask is sent anywhere. There is no account, no sign-in, and no tracking. It works in airplane mode. THE LIBRARY Twenty genres: philosophy, English, American, Russian, French, German and Spanish literature, the ancient and classical world, drama and Shakespeare, science fiction, horror, biography, letters, travel, natural history and sacred texts. Plato, Aristotle, Epictetus, Marcus Aurelius, Kant, Nietzsche, Homer, Dante, Cervantes, Austen, Dickens, Melville, Tolstoy, Dostoevsky, Twain, Poe, Shelley, Stoker, Verne, Wells, Darwin, Thoreau, Whitman, and more. Four diaries, searchable by date: Samuel Pepys, John Evelyn (two volumes), and Boswell's journal of his tour of the Hebrides with Samuel Johnson. READ, NOT JUST SEARCH Browse the library by genre, open any book, and read it chapter by chapter. The diaries open by date. Every source passage under an answer can be read in full. THE FOREST Every book in the library grows as a tree in a 3-D forest, one grove for each genre. Drive a cart along the roads, or take the guided tour, which stops at each grove. Open a tree to see its book, read it, or ask a question about that book alone. Each book in Browse and each source under an answer has a Tree button that takes you to its tree. The forest works offline, like the rest of the app. ANSWERS YOU CAN CHECK The app searches first and writes second, and the order never changes. An answer is written only from what the search found, and each passage that reached the model is marked. If the passages do not support an answer, it says so instead of inventing one. The settings let you tune how many passages are read, how closely they must match, and how the model writes, and every answer records the settings that produced it. CHOOSE WHERE THE MODEL RUNS On-device is the default and uses Apple Intelligence on your iPhone, iPad or Mac. Private Cloud is optional: it sends your question and the selected passages to Apple's Private Cloud Compute for a larger model, under Apple's privacy guarantees, and never to us. Or turn answers off and use the app as a search engine for the classics. ASK FROM SIRI Ask The Knowledge Press from Siri and Shortcuts. REQUIREMENTS Search, reading and browsing work on any iPhone, iPad or Mac running iOS 26, iPadOS 26 or macOS 26. Written answers need Apple Intelligence. The Knowledge Press is not affiliated with Project Gutenberg. The texts are public domain; Project Gutenberg and the Internet Archive are acknowledged as their sources.