Unpaywall

Legally get full text of scholarly articles as you browse.

Users900K

Rating4.0

Reviews277

Manifest versionV3

7-day growth0

7-day growth rate0%

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30-day rating change

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3.99

Latest

3.99

30-day rating change

0.00

2026年5月29日2026年6月4日

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Version3.99

ManifestV3

Size670KiB

Languages1English

Published--

Store updated--

Last crawled--

Overview

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Get full text of scholarly articles as you browse. When you view a research article, Unpaywall automatically looks for a copy in our index of 20 million free, legal fulltext PDFs. If we find one, click the green tab to read the article.

Unpaywall points you to legal, author-posted manuscripts that are hosted on university and government web servers. We are pointing to versions that have been posted with the full and explicit authorization of the publishers themselves.

These free, author-posted manuscripts are often called "Green Open Access" and are a longstanding and completely legal part of the scholarly communications ecosystem. The majority of scholarly journals permit authors to "self-archive" their papers on university and government web servers. It's these legally self-archived papers that Unpaywall helps users find. Any papers posted outside of publisher permissions are NOT included in our index.

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The Chrome Web Store shows 277 reviews, but only 0 review bodies have synced into ExtScope so far. Showing the synced reviews available right now.

5★

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AI product read

Automatically detects scholarly articles being viewed and finds free, legal open-access full-text PDFs from a database of 20 million articles

Researchers and students hit paywalls when trying to read scholarly articles. Unpaywall bypasses paywalls by pointing users to legal, author-posted manuscripts hosted on university and government servers (Green Open Access) or other freely available versions.

1) User browses any scholarly article page. 2) Content script (unpaywall.js) extracts the DOI from meta tags/data attributes/publisher-specific HTML. 3) Extension searches two sources in parallel: local PDF links on the page and the oaDOI API. 4) If a free legal version is found, a colored tab appears on the right edge of the page. 5) User clicks the tab to open the free full-text PDF. If no free version is found, a grey locked icon is shown.

Target users: Researchers / University students / Academics / Anyone reading scholarly journal articles

Source code is fully available and analyzed. All key files (background.js, unpaywall.js, options.js, popup.js, inside-frame.js) were read in full. The oaDOI API response format and unpaywall.org welcome/logging behavior could not be verified server-side, but client-side code shows no auth or payment logic.

Monetization

No paid features detected

The extension is entirely free with no payment infrastructure. No Stripe/payment platform references, no premium/upgrade UI, no subscription or billing logic. All 'paywall' keyword hits refer to the product name 'Unpaywall', not paid features. 'Pro' hits are false positives from jQuery code. 'License' hits are from Font Awesome and jQuery library licenses. The oaDOI API is used freely with no API key gating.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: The extension operates entirely without user authentication. It runs automatically as a content script on all URLs, extracts DOI from page meta tags and attributes, then queries the public oaDOI API with a hardcoded email parameter ([email protected]) — not user credentials. Settings are stored locally in chrome.storage (only 'OA Nerd Mode' toggle). No login UI, no auth flows, no user accounts anywhere in the codebase.

Permission risk

Medium-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage

Publisher

extension

Independent publisher

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