Lean Library 4+

Lean Library B.V.

    • 3.0 • 7 Ratings
    • Free



Put your library on your shoulder as you research

The Lean Library extension is a free tool which assists your library in delivering their services directly into your research workflow!

With the Lean Library extension, you can unlock access instantly and legally to millions of academic papers, streamline access to your library content whenever and wherever you might need it and get direct support within systems and web pages you use the most like Google Scholar, PubMed and thousand more!

Ready to start using Lean Library?

Install the extension, select your institution and begin researching! Even if you aren’t affiliated to an institution, you can still get quick and seamless redirection to open access materials absolutely free by downloading the extension and selecting Lean Library Open as your library.

Lean Library is a fantastic complement to other research tools you may already use including LibKey Nomad, EndNote Click and many more.

What’s New

Version 2024.10.1

- Bug fix to reduce the number of API calls for article metadata and redirects

Ratings and Reviews

3.0 out of 5
7 Ratings

7 Ratings

Willionvii ,


Why couldn't I update? App Store told me I could.

Developer Response ,


Thanks for your feedback and we are sorry to hear this.   

In order to investigate this a bit more, we will need some more details about your Mac set-up and the version of the extension you were using, when updating the extension.

Please contact us at support@leanlibrary.com and we would be very happy to look into this and help resolve it for you 

Best wishes
Lean Library team

Opposed to Nicknames :) ,

Extremely Poor Privacy

Requires the following permissions:
"Can read sensitive information from webpages, including passwords, phone numbers, and credit cards on all webpages."

This is severe. I refuse to give this app access to all my passwords.

Developer Response ,


Thanks for reaching out to us and we understand your concerns. With some of our core features (eBooks alternatives, article alternatives, highlight and search), our extension does require a few details to provide you with a seamless service. 

In order to function, the extension needs to scrape the page for academic material IDs (like ISBN and DOI) and based on this information you getting redirected to a full text location.  We can assure you, we do not collect any personal data and we also use highly advanced regular expressions when scraping the pages to make sure our extension only picks up DOIs and ISBNs.

You can find more information about our data privacy commitment on our website : https://www.leanlibrary.com/data-privacy/ 

Best wishes
Lean Library team

Actual Grownup ,

Why does my library recommend this?

I would give it more stars if it could install, but it just hangs. It says it needs Safari 14.0, but I have Safari 14.0.

Developer Response ,

Hello there,
I am sorry to hear about the inconvenience this is causing you.

Unfortunately, Safari update has been problematic. We have received a few more reports on the same issue and we have been investigating this with Apple. We found out what happens is that during the macOS / Safari update, some files were incorrectly left from the previous version, and that is why the extension does not work and it cannot be reinstalled properly. We have identified BigSur reinstall to be the only way to fix it for now, until a follow-up update does not come from Apple, which fixes this issue.

I am sorry for not being able to provide you with a better solution. Unfortunately, as the issue is with the Apple updates. In this case, please kindly consider using the extension in any other major browsers, as they should work without any issue (Chrome, Firefox, Opera, EDGE).

I hope this issue will be fixed soon.

Kind regards,

App Privacy

The developer, Lean Library B.V., 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 Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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