Underline: Book Quotes & Notes
Scan, Save & Search Highlights
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
You underline a line in a book. You copy it into a notebook. Then the notebook stays at home, exactly when you want to find that passage again.
Underline is your personal quote notebook for the printed books you read. Save the lines you underline, keep them organized by book and page, and find any of them in seconds, wherever you are.
SAVE A PASSAGE IN SECONDS
• Point your camera at the page. Text is recognized right on your device
• Tap to select just the sentences you want, then save
• Prefer typing? Add any quote manually
• Add the page number, a personal note and tags
BUILD YOUR BOOKSHELF
• Add books by scanning the ISBN barcode or searching by title or author
• Every quote is kept with its book, author and page
• Mark favorites to keep your most loved lines one tap away
FIND ANY LINE, ANYWHERE
• Full-text search across every quote and note
• Filter by book, tag or favorites
• Your reading notes travel with you, no paper notebook required
SHARE THE WORDS YOU LOVE
• Turn a quote into a clean, beautiful card
• Share it to Instagram Stories, messages or anywhere else
YOUR DATA, YOUR FILES
• Back up your whole library to a single .underline file and restore it anytime
• Export to CSV or Markdown, ready for Notion, Obsidian or a spreadsheet
PRIVATE BY DESIGN
• No account, no sign-up
• Your quotes are stored on your device, not on our servers
• Works offline. The internet is only used when you look up a book
Text recognition works with Latin-alphabet languages (English, Spanish, French, German, Italian, Portuguese, Turkish and more), plus Russian, Arabic and Japanese. Handwriting is not supported.
UNDERLINE PRO (OPTIONAL)
• No ads
• Every quote card style, PDF export of a book's quotes and full reading insights
• Monthly or yearly subscription (the yearly plan starts with a free trial), or a one-time lifetime purchase
• Your books and quotes stay free and unlimited without Pro
Underline is free to download. Start your quote journal with the book on your nightstand.
Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them in your App Store account settings.
Terms of Use: https://zaustudios.web.app/apps/underline/terms
Privacy Policy: https://zaustudios.web.app/apps/underline/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Redesigned Underline Pro screen: every plan and the purchase button are visible at a glance.
• New About page in Settings: version, support, privacy policy and rating, all in one place.
• Small design improvements
The developer, Zeynal Abidin UNLU, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Zeynal Abidin UNLU
- Size
- 50.2 MB
- Category
- Books
- Compatibility
Requires iOS 15.5 or later.
- iPhone
Requires iOS 15.5 or later. - iPad
Requires iPadOS 15.5 or later. - iPod touch
Requires iOS 15.5 or later. - Mac
Requires macOS 12.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 9 more
- English, Arabic, French, German, Italian, Japanese, Portuguese, Russian, Spanish, Turkish
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Underline Pro Lifetime $9.99
- Underline Pro Monthly $0.99
- Underline Pro Yearly $4.99
- Copyright
- © 2026 Zau Studios