Finding Open Access Papers

Overview

Use Unpaywall to find legally available open access versions of papers that appear to be behind paywalls.

Core principle: Many paywalled papers have free versions (preprints, author manuscripts, institutional repositories). Unpaywall finds them.

When to Use

Use this skill when:

• DOI resolution hits a paywall
• Paper not available in PubMed Central
• Publisher site requires subscription
• Need full text for highly relevant paper (score ≥7)

Use BEFORE giving up on full text access

Unpaywall API