Tap to translate
One tap shows the full sentence in your language with the matching word(s) highlighted — you learn words in context, not in a list.
TReader · free · no ads · fully offline
Your books. One tap from understanding.
TReader is the reader for .tbook books. Read the original at your own pace; tap a word you don’t know and the whole sentence appears translated, with the matching word highlighted. Every translation lives inside the file, so there is no network, no account and nothing to wait for.
Android 8.0+ Linux · Windows · macOS
Free no ads, no accounts
Offline nothing leaves your device
8 languages in the book that ships with it
Screens
A reader that gets out of the way
Screenshots from the Android app.
Features
Everything a reading learner needs
Built around one gesture, then polished for long evenings of reading.
IPA pronunciation
For English source text the tapped word comes with its phonetic transcription, from a dictionary bundled inside the app.
Offline dictionaries
Install a dictionary for your language pair and open the full article straight from the word popup — the only thing the app ever downloads.
Read aloud
Hear any word or sentence through your device’s text-to-speech, right at the moment you look it up.
E-ink mode
Black on white, no animations, volume-key page turns — detected automatically on e-readers and switchable by hand.
Tuned to your eyes
Serif, sans or mono; adjustable size and margins; light, dark or system theme; paged or scrolled reading.
Switch the language
A book carrying several target languages gets a language picker inside the translation sheet — same page, another language.
Nothing is collected
No account, no ads, no analytics. Your library and your reading positions never leave the device.
Platforms
Android first, desktop right behind
TReader for Android
The main app. A complete book — The Adventures of Sherlock Holmes, translated into eight languages — is built in, so you can start reading the moment it installs.
- Tap-to-translate with word-level highlighting
- Offline dictionaries, IPA and read-aloud
- E-ink mode; paged or scrolled reading
TReader for Desktop
The same reader on Linux, Windows and macOS: a small native build (about 6 MB) that opens the very same .tbook files.
- Paged or scrolled reading, keyboard page turns
- In-book search with highlighting
- Covers, per-book position, one-click import
What it reads
The .tbook format, in one minute
A .tbook is a ZIP of UTF-8 JSON: the original book, a translation of every sentence, and a map from each source word to the word(s) it becomes.
Baked in, therefore offline
Translations and alignments are computed once, when the file is made. The reader never calls a server — on a plane, in the metro, in a dead zone it behaves the same.
Aligned word by word
Each source word points at the exact target word(s) it becomes, even when the sentence is reordered or one word turns into three. That is what lights up when you tap.
Many languages, one file
The source language is the pivot and every target aligns back to it, so a single book can carry eight translations and still be one file you copy around.
Where the books come from
A complete book ships inside the app. To add your own, convert an EPUB or FB2 online and import the .tbook you get back — or run the open-source converter yourself and keep everything on your machine.
TReader · free · no ads · fully offline
Install it, open a book, tap a word.
Free, offline, no account — and the first book is already inside.
Android 8.0+ Linux · Windows · macOS