CorpusKit Reader

Open a .corpus bundle and ask it anything. CorpusKit Reader turns a body of text into fast, private, semantic search — and, on supported devices, grounded answers written entirely on-device. Universal — one purchase covers Mac, iPad, and iPhone. WHAT IT DOES Ask in Plain Language Type a question and CorpusKit Reader retrieves the passages that actually answer it — by meaning, not just keywords. On devices with Apple Intelligence, it then writes a short answer grounded only in those passages (retrieval-augmented generation). Without it, you still get the most relevant passages, ranked. Read in Context Browse the source by chapter, and jump from any answer straight to the passage in the text. Save passages you want to keep and return to them anytime. Bring Your Own Corpora Open any .corpus bundle from Files or iCloud Drive, or one made with CorpusKit Studio. Sample corpora are built in, and more free corpora are available from the in-app catalog. PRIVATE BY DESIGN Everything runs on your device. There is no account, no analytics, and no tracking, and search and answers work fully offline — nothing you read or ask leaves your device. (Optional links to an online help guide and corpus catalog open in your browser.) WHO IT'S FOR Readers, students, and researchers who want to search and question a book, a manual, or a collection of documents — privately, and without a connection. One-time purchase. No subscription. Requires iOS 26 or macOS 15.6 or later.