Add people, compare their libraries, and get recommendations. To see how everyone relates as a map, visit the Constellation.
Circles
Add a person
🔒 Sign in (top right) to import a shelf — adding people uses the matcher, which needs a signed-in account.
Drop a file here or click to choose — books (CSV, JSON, text, Excel) or a Letterboxd export CSV (ratings.csv / diary.csv)
Goodreads: profile/shelf URL imports the “read” shelf (ratings + dates; must be public); also accepts a Goodreads .xlsx export. Letterboxd: profile URL imports recent films; drop your export’s ratings.csv for your full film history. Add a person’s books first, then their films, to combine both.
Circle insights
Reading-circle fingerprint — how a group compares across the 40 meta-concepts
Reader themes — a portrait + idea clusters, by Opus 4.8
Side by side
Recommendations
By domain
Titles
Adding a person runs their list through Claude (Sonnet 4.6) once — any
format works (CSV, JSON, markdown, messy paste, a gist URL). Saving stores
the processed list so later comparisons are instant and free. You and each
saved person can be compared in any pairing.