CorpusKit Reader
Open a .corpus and ask it in plain language. Private, on-device semantic search — with grounded answers on devices that support Apple Intelligence.
Universal — iPhone, iPad, and Mac · One-time purchase
Type a question and get the passages that actually answer it — by meaning, not just keywords. On supported devices, a short answer is written on-device, grounded only in those passages, with its sources shown.
Browse the source by chapter, jump from any answer straight to the passage, and bookmark what you want to keep.
Open a .corpus from Files or iCloud, use the built-in samples, download free ones from the catalog, or make your own with CorpusKit Studio.
Everything runs on your device. No account, no tracking, and search and answers work fully offline — nothing you read or ask leaves your device.