A reading app and book-intelligence API

Your reading life, collected.

Collected keeps what you’ve read, what you want to read, and what you thought about it in one place. The same book intelligence that powers the app is available to products through our API.

See the app Explore the API

● API online · developer access is rolling out

API live

Current served profilePromoted · v2

The Left Hand of Darkness

Ursula K. Le Guin

Hainish Cycle · Book 4

contemplativeimmersiveemotionally intense

Genre: Science fiction · Literary fiction
Subgenre: Philosophical science fiction · First contact
Tone: Atmospheric · Cerebral · Melancholic · Reflective
Pace: Measured
Focus: Ideas · Relationships · World
Setting: Gethen · Invented world · Wilderness
Themes: Gender · Identity · Belonging · Isolation · Politics and ideology · Religion and faith
Prose: Atmospheric · Essayistic · Lyrical
Narrative: First person + mixed POV · Braided + framed

Profile scores1–5

Prose4/5

Structure4/5

Ideas5/5

Background2/5

Emotion4/5

Reading effortHigh · 68/100

Preferred edition · 304 pages · Ace Books · ISBN 9780441478125

The work response also includes canonical identity, an original description, editions, authors, series, awards, taxonomy, provenance, and a record version.

What’s in the catalog now

56k+: works
51k+: original descriptions
51k+: reader profiles
5k+: author profiles

For readers

Keep your books in one place.

Collected is being built to do three things well: keep your books organized, remember what mattered, and help you choose what to read next.

Keep your books together

Track what you’ve read and what you want to read next in one place.

Pick your next book

Find books by tone, pace, setting, and reading mood—not just genre.

Remember what mattered

Keep ratings, notes, favorites, and reading history without turning reading into homework.

For developers

Book intelligence for products that already know the book.

Collected resolves a record to the right work, then adds the parts that make it useful to readers: original descriptions, reading signals, author context, series, recognition, and provenance.

Read the docs Preview API access →

Book records

Works, editions, contributors, and publication history

Descriptions

Original descriptions; uncertain records stay on hold

Reading experience

Tone, pace, density, reading mode, themes, and setting

Authors

Author profiles, bibliographies, sources, and provenance

How we handle the data

“If we can’t support a claim, we don’t publish it. Unknown is better than made up.”

01 Weak or unresolved records stay on hold instead of being filled with guesses.

02 The app and API use the same metadata, so improving it helps both.

03 Sources and provenance stay attached to the data.

Developer access

The API is running. Self-serve access comes next.

Read the current contract and preview the account area while we bring customer access online in stages.