Duo Book Dictionary
Read Spanish, tap any word
Only for iPhone
$0.99 · Designed for iPhone. Not verified for macOS.
iPhone
Tap a word for its meaning, hold a sentence for the whole passage. Free classics and levelled readers, an offline Spanish dictionary, and nothing that leaves your phone.
Read a real book in the language you are learning, and never leave the page to look a word up.
Tap a word and its meaning appears. Hold a sentence and the whole passage comes back in English. Both answers come from the device itself — the Spanish dictionary is built into the app, and the translation is Apple's own, running on your phone.
TWO LIBRARIES, BOTH FREE
Project Gutenberg's classics, on shelves for popular, short, kids, tales and adventure. Bloom Library's levelled readers, graded one to four for people just starting. Every book is free and openly licensed. Nothing to buy, no account to make.
SORTED BY HOW HARD IT READS
Neither catalogue publishes a difficulty rating, so this app works one out from the book's own sentences. Shelves come back easiest first, which means you can start where you can cope and climb.
EIGHT LANGUAGES
Spanish, French, German, Italian, Portuguese, Russian, Dutch and English. Spanish carries a full dictionary inside the app, so it works with no signal at all; the others look up against Wiktionary.
EVERY WORD YOU PICKED
Words, sentences and passages you asked about are kept together in one deck, in the order you met them — so finishing a book leaves you with a list worth going back over.
SET THE PAGE
Type size, typeface and paper colour, all on one screen, shown over a paragraph set the way your book will be.
PRIVATE BY DEFAULT
No account, no sign-in, no tracking, no ads, no analytics. What you read and what you looked up stays on your device.
Books come from Project Gutenberg (public domain) and Bloom Library (CC BY 4.0 and CC BY-SA 4.0), and the built-in Spanish dictionary is drawn from Wiktionary (CC BY-SA 4.0). Every book names its own copyright holder, and the full credits, licences and the changes this app makes to a text are in Settings › Credits.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Alexander Kvamme, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Alexander Kvamme
- Size
- 63.8 MB
- Category
- Books
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Home Offices International
