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Everything You Need to Research Better

Features Built for
Serious Researchers

From lightning-fast book discovery to git-style version control, Lib4All gives you every tool you need to do your best academic work.

12+
Core Features
2M+
Books Indexed
∞
Cloud Storage
< 2s
Sync Speed
📚 Discovery

Find Any Book in Seconds

The most powerful academic book search ever built.

Free

AI-Powered Search

Search by title, author, ISBN, or keywords across 2M+ books. Fuzzy matching ensures you always find what you need.

Free

Universal Library Access

Textbooks, research papers, novels, academic journals - access any genre, any subject, in any language.

Pro

Smart Filters

Filter by publication year, author, subject, language, and more. Build precisely curated reading lists.

✏️ Annotation

Annotate Like a Scholar

Every insight captured, organized, and retrievable.

Pro

Multi-color Highlights

Use 6 highlight colors to categorize your insights. Yellow for key points, green for examples, red for critical notes.

Pro

Inline Notes

Attach rich-text notes to any page, paragraph, or selection. Your thoughts live alongside the content.

Pro

Tag System

Create custom tags and filter all annotations across your entire library by any combination of tags.

☁️ Cloud Storage

Your Library. Always with You.

Zero storage limits. Zero extra cost.

Pro

Infinite Cloud Storage

Store your entire library in our secure cloud, completely unlimited and completely private. Your data, always with you.

Pro

Real-time Sync

Open a book on your laptop, pick it up on your phone. Annotations sync in under 2 seconds across all devices.

Pro

Cross-Device Access

Works perfectly on desktop, tablet, and mobile. Responsive design with offline reading capabilities.

🔀 Version Control

Git for Your Research

Track progress, restore history, never lose work.

Pro

Commit History

Every highlight, note, and edit is versioned. Restore any previous state of your research with one click.

Pro

Research Progress Tracking

Visual timeline of your study sessions. See exactly how your understanding of each book evolved.

Pro

Export Anywhere

Export all annotations to Notion, Obsidian, Markdown, or PDF. Your research goes where you do.

Free vs Pro

Side-by-Side Comparison

See exactly what you get with each plan.

Feature
Free
Pro - ₹199/mo
Book Catalog Access
PDF Reader
Basic Search
Unlimited Secure Cloud Storage
-
Unlimited Annotations
-
Multi-color Highlights
-
Version History
-
Cross-device Sync
-
Smart Filters
-
Export to Notion/Obsidian
-
Priority Support
-
Early Feature Access
-

7-day money-back guarantee • Cancel anytime

What Researchers Are Saying

"The annotation speed alone is worth the Pro upgrade. I do 3x more research now."

RV
Rahul V.
IIT Madras

"Version history saved me when my laptop crashed mid-annotation session. Life saver!"

AK
Ananya K.
IISC Bangalore

"Finally, a research tool that feels modern. The UI is incredible compared to anything else."

DP
Dev P.
NIT Warangal
FAQ

Common Questions

Is the Free plan actually free - forever?
Yes! The Free plan is free forever with no credit card required. You get access to search the book catalog and discover academic literature. Upgrade to Pro for unlimited annotations, version history, and secure cloud storage.
How does Lib4All cloud storage work?
Lib4All uses a proprietary distributed cloud infrastructure to store your books and annotations securely. All data is encrypted at rest and in transit. You own your data, export or delete it at any time.
Can I cancel my Pro subscription anytime?
Yes, absolutely. Cancel at any time from your account settings. You'll retain Pro access until the end of your billing period, and we offer a 7-day money-back guarantee with no questions asked.
Does Lib4All work on mobile?
Yes! Lib4All is fully responsive and works beautifully on all devices. Your library and annotations sync instantly across desktop, tablet, and mobile.
What file formats do you support?
Lib4All primarily supports PDF, ePub, and DjVu formats. Our custom PDF viewer is optimized for speed and annotation performance even on low-end devices.
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Ready to Research Smarter?

Join 10,000+ researchers who already use Lib4All every day. Start free, no credit card needed.