Lithium Pro is a premium upgrade for the free Lithium app, designed to enhance your reading experience. This app unlocks advanced features that allow users to sync their data across multiple devices via Google Drive, ensuring seamless access to their library. With customizable themes, readers can personalize their interface by adjusting background and text colors. The app also offers additional highlight colors, giving users more ways to annotate their books. Ideal for avid readers who value both functionality and personalization, Lithium Pro transforms the standard reading experience into a tailored, cross-device journey.

While the core book content is not synced, the ability to maintain consistent settings and preferences across devices makes this app particularly valuable for users with multiple gadgets. The Pro features ensure that your reading environment remains just as you like it, regardless of which device you're using.

Lithium Pro offers several distinctive features that set it apart in the realm of e-reading applications. One of its standout capabilities is the Sync feature, which uses Google Drive to keep user data synchronized across various devices. This ensures that your reading progress, bookmarks, and other important data are always up-to-date, no matter which device you pick up next.

Another significant feature is the ability to create custom themes. Users can modify page background color, text color, and link colors according to their preferences. This level of customization allows for a personalized reading experience that can reduce eye strain and make reading more enjoyable. Additionally, the app provides more highlight colors than the standard version, enabling users to categorize and emphasize different parts of their texts more effectively.

These features collectively offer an enhanced reading experience, focusing on user comfort and convenience. By allowing extensive personalization and maintaining continuity across devices, Lithium Pro meets the needs of modern readers who demand flexibility and control over their digital libraries.