TruNaut
Explore the truth
The Yellow Flower Company
TruNaut reads EPUB, PDF, and web pages, and is built around a single idea: highlight a passage, ask it a question, and talk it through with a tutor that knows the book, the chapter, and you.
Free. Opens Apple's TestFlight app — iPhone or iPad on iOS 26 or later.
On Android? We'll email you when it lands.
But that was itself a capital mistake. We never know any data before interpreting it through theories. All observations are, as Popper put it, theory-laden, and hence fallible, as all our theories are. Consider the nerve signals reaching our brains from our sense organs.
↑ tap the highlighted sentence
“Reading a difficult book should feel worse outside this app than inside it.”The product philosophy, in one line
Everything in TruNaut turns on a single highlight — the anchor for a note, a conversation, and eventually something you keep. The plates in the margin are the app itself; follow any figure reference to bring one up.
Import EPUB and PDF files, add a web page by URL, or share a page to TruNaut straight from your browser. Everything lands in one library and normalizes to a single reading surface — floating chrome, table of contents, full-text search, bookmarks, and light, dark, or system themes.
Select a passage and highlight it in any colour . Attach a freeform note, or tag it against your own vault vocabulary . Tags are matched on device, with no AI call, so capturing a passage never costs you a request.
Tap a highlight and it opens into a full-screen conversation . The tutor sees the highlighted text, the surrounding context, the chapter title, and a reader profile that carries your interests and level from book to book. Bring your own key — OpenAI, Anthropic, Google, or a model running on your own machine.
Generate atomic notes or flashcards from a highlight and its conversation. Nothing reaches your vault unapproved — every insight waits in a review sheet first . Approved notes sync as Markdown to iCloud, ready to drop into Obsidian, and every conversation stays filed by chapter under Deliberations .
Books, highlights, notes, and conversations live in local SQLite databases, and they stay there. On the bring-your-own-key tier the only network traffic carrying your reading is the request you send your own AI provider. A paid tier asks you to sign in — that tells us an email address, so a purchase follows you between your devices, and nothing about what you read.
Free, on iPhone and iPad (iOS 26 or later).
On Android? Leave your email and we'll write once, when it lands.