Semantica reads a book chapter by chapter, maps the emotions in each one, and charts how they change from the first page to the last. That emotional arc then recommends books for your mood, scores a soundtrack to read along with, and gives the characters a voice.
See how it worksThe idea
Recommendations usually lean on genre and tropes — enemies to lovers, the chosen one, the locked-room mystery. But two books with the same tropes can feel completely different to read.
Semantica follows the feeling instead: where a story is warm, where it aches, where the dread builds and where it finally breaks. That shape is what we use to guide what you read next.
How it works
The book is broken into its chapters, so every part of the story is read on its own terms.
Each chapter is scored for the emotions running through it: joy, sadness, fear, anger and more.
Those scores are plotted chapter by chapter, showing how the feeling of the book rises, falls and turns.
The arc, together with a summary of the book, drives recommendations, a soundtrack and character voices.
What the arc unlocks
Tell Semantica how you feel or how you want to feel and it finds books whose emotional arcs match, not just the genre you usually reach for.
Music generated from the book's emotional shifts, meant to play alongside you as you read, chapter by chapter.
Character analysis across the whole book gives each speaker a distinct voice, for audiobook-style clips of the story.
Two ways in
Five classics, from Frankenstein to The Great Gatsby, already analyzed. Walk through the full pipeline: each chapter's emotions, the arc across the book, which title fits your mood, and the soundtrack made to read it by.
Bring any book you own. The emotion analysis runs entirely in your browser — your PDF is never uploaded or shared with any service, so your copy stays yours. The arc it produces, with a summary of the book, then shapes a soundtrack and recommendations.
See what a story feels like before you start it — and hear it while you read.
Demo books are texts from Project Gutenberg.