Paste a DOI, a handful of DOIs, or a whole reference list. We'll locate the open-access copy of each paper across OpenAlex's index of 250M+ works — and tell you exactly how open it is. Nothing leaves your browser.
DOIs are auto-extracted — paste raw references if you like (up to 50).
Resolved live against OpenAlex (CORS-open, no key). Open-access status reflects what is legally and freely available — diamond = free to read and publish (no fees), gold/hybrid = free on the publisher, green = free in a repository. A free companion to the live research search and the 1,431-work archive. CC BY-NC-SA 4.0.