Lectern: EPUB & PDF Reader

Hofstack

About this app

Read. Listen. Follow Along.

Lectern automatically matches natural sounding offline AI voices to your book's language and highlights every spoken sentence as you read.

Lectern is an offline eBook reader for EPUB, EPUB3, PDF, MOBI, AZW, AZW3, FB2, TXT and comics. Read your books or listen to supported books with natural sounding offline AI voices and synchronized text highlighting.

No account. No subscription. No ads. No unnecessary permissions.

Your books, reading progress and settings stay on your device. Everything works offline unless you choose to connect your own cloud storage or OPDS catalog.

🎧 Read and listen together

Lectern lets you listen to supported books using natural sounding offline AI voices powered by Piper and Kokoro while every spoken sentence is highlighted in real time.

Perfect for commuting, bedtime reading, language learning or reducing eye strain.

Features include:

• Natural sounding offline AI voices powered by Piper and Kokoro
• Automatic language detection
• Automatic voice matching to your book's language
• Synchronized text highlighting
• Adjustable reading speed
• Adjustable voice pitch
• Lock screen controls
• Notification controls
• Bluetooth headset support
• Sleep timer
• Continue exactly where you stopped

🗣️ Automatic language detection

Open a book and Lectern detects its language, then matches it to a natural offline AI voice. Voice matching covers over a dozen languages, including Arabic, Chinese, Japanese and Hindi.

📚 Read all your books in one app

Supported formats:

• EPUB
• EPUB3
• PDF
• MOBI
• AZW
• AZW3
• FB2
• FBZ
• TXT
• CBZ
• CBR

PDF documents can be viewed in their original layout, reflowed for comfortable reading or listened to with text-to-speech when supported.

✍️ Built for comfortable reading

Adjust:

• Fonts and custom fonts
• Font weight
• Margins
• Line spacing
• Paragraph spacing
• Hyphenation
• Drop caps

Built-in reading profiles:

• Standard
• Bedtime
• Dyslexia

The Dyslexia profile combines OpenDyslexic fonts, optimized spacing and comfortable colors for easier reading.

Themes:

• Light
• Dark
• Sepia
• OLED Black

🔖 Highlights, bookmarks and notes

• Highlights
• Bookmarks
• Notes
• Markdown export
• JSON export
• Kindle My Clippings import

Organize your library using nested shelves, series, ratings and reading status.

📈 Build a daily reading habit

Track:

• Reading streaks
• Daily reading goals
• Reading sessions
• Reading history
• Average session length
• Estimated reading time remaining
• Chapter progress
• Multi-year reading heatmap

📖 Dictionary and vocabulary trainer

Tap any word to view offline dictionary definitions powered by WordNet.

Save new words to your vocabulary trainer and improve retention using the proven SM-2 spaced repetition system.

☁️ Sync on your terms

Use multiple folders as your library through Android's Storage Access Framework without intrusive storage permissions.

Synchronize reading progress, bookmarks, highlights and statistics through shared folders on:

• Google Drive
• Dropbox
• Nextcloud
• OneDrive

Browse OPDS catalogs such as Project Gutenberg or your own Calibre-Web library.

Share books directly to Lectern from any Android app.

🌍 A reader for every language

Available in 9 languages:

• English
• Dutch
• German
• French
• Italian
• Arabic
• Chinese
• Japanese
• Hindi

Full right-to-left (RTL) support for Arabic together with automatic language detection makes Lectern ideal for multilingual libraries and language learning.

Lectern supports reduced-motion accessibility and works beautifully on Android e-ink devices such as Boox and Meebook.

Whether you're looking for an EPUB reader, PDF reader, comic reader, text-to-speech reader, AI voice reader, multilingual ebook reader, RTL Arabic reader, ebook library or a dyslexia-friendly eBook reader, Lectern brings everything together in one calm, fast and private reading experience.

Read. Listen. Follow Along.

What’s new

📚 Publisher sidebars, callouts and margin icons now render as intended, without pale bands behind the text.
🔊 Audio settings show only the controls your current voice can actually use.
🗣️ Kokoro now matches what your device can really run, and the voices already on your phone have readable names.
🧭 The welcome tour no longer ends if you cancel the folder picker.