On paper · one photo
Photograph your shelves
One photo, twenty spines. Ten photos and your whole bookcase is in, in the time it would take to scan three barcodes.
Your library, on paper and on your Kindle or Kobo. We'll suggest what comes next, and only what's already out there second-hand and at a good price.
Try it without an account. We compare every edition of the books we already watch; if one is missing, ask us for it. Prices from Spanish bookshops, for now.
Explore the 840 books we already watch →From your phone, in three steps. No password.

Photograph your shelf, scan a barcode, search for a title or import your history from Goodreads, StoryGraph or Kindle.

What you've read, what you're reading and what you've lent, on paper, as an ebook or an audiobook. “For you” suggests what to read next, from Pecia's guides and what you liked.

Save what you want to read, with a maximum price if you like. In Spain, we write when a second-hand copy drops below it.
Screenshots of a sample account, with prices from the latest crawl. Your library is private: nobody else sees it.
Rate with one tap. That's all we need.
No typing titles, no scanning barcodes one by one. Paper and ebooks each come in their own way. Coming from Goodreads or StoryGraph? Bring your list. See what your to-read list costs today.
On paper · one photo
One photo, twenty spines. Ten photos and your whole bookcase is in, in the time it would take to scan three barcodes.
On Kindle or Kobo · one cable
Plug it into your computer and we read your whole library — with how far along you are in each book. No Amazon or Kobo passwords: just the cable. Got PDFs? Convert them to EPUB.
It's imported from your computer, not synced in the background: you bring it in whenever you want. And the book never leaves your device — we only read the title and your progress.
And for your ebooks, free: Validate EPUB · Ebook compatibility · All tools
Before the second-hand price, check who already has it. Your friends see the shelves you show them, and you see theirs.
Their shelves
If a friend has a book from your list, we tell you before its price. Ask to borrow it with one tap.
Loans
Note who you lent it to and until when, even if they're not on Pecia: a name is enough. No more books that never came back.
Swaps
Pick a book of yours and one from their shelf, and propose it. When each of you has something the other wants, we propose it for you.
You can track ebook loans too, just like paper ones. Only files that are public domain in Spain or openly licensed travel through Pecia; we don't touch the rest. Swaps are paper only.
Printing one copy of about 300 pages emits around 1.2 kg of CO₂ across raw materials, plates, printing and delivery. One that's already printed emits nothing: it just changes shelves.
That's why Pecia only looks at the second-hand market. It isn't a stance: it's the only place where the price moves and nothing gets cut down.
What you owe the forest
11
copies rescued instead of printed
≈ 13 kg of CO₂
never emitted
And when you finish one, you put it back into circulation from right here.
None of these show up because they're trending. They show up because they fit what you rated highly, and because copies are going around today.
Because you read La casa de Bernarda Alba
More by Federico García Lorca, and right now there are 68 used copies going around.
Because you read El monje que vendió su Ferrari
More by Robin Sharma, and right now there are 17 used copies going around.
Because you read Crónica de una muerte anunciada
More by Gabriel García Márquez, and right now there are 38 used copies going around.
The cheapest against their cover price, from the latest pass through second-hand bookshops.












Video reviews of every book, right on its page. No other app has them.
ROMEO Y JULIETA de William Shakespeare | EL MEJOR RESUMEN COMPLETO Y ANÁLISIS LITERARIO
La Hija de la Noche 🔥 Resumen [Laura Gallego]
Resumen completo de «Las bicicletas son para el verano» de Fernando Fernán Gómez
💡 EL INVERSOR INTELIGENTE de Benjamin Graham: RESUMEN animado del libro en Español | RESEÑA 2021Your library — what you've read and what you want to read — works from any country. And if you're in Spain, we wait for new releases to drop in price for you. That's what the account is for.
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