Peer Community In

“Peer Community in” (PCI) is a non-profit scientific organization that aims to create specific communities of researchers reviewing and recommending, for free, unpublished preprints in their field.

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Image Credits

The network image was drawn by Martin Grandjean: A force-based network visualization - CC BY-SA.

How can you know whether or not a preprint has been recommended by a PCI?

You’re looking for articles in Google ScholarGoogleEurope PMCZenodo or bioRxiv. You retrieve a result list of articles containing preprints. You want to know whether the preprints have been recommended by a PCI after peer-review or not. How can you do that? There are several options:

1- Go to the PCI X web site and search the article

2- In Europe PMC, check the REVIEW section

3- In bioRxiv, check the “TRiP Reviews” green icon below the title and authors’ list. You can also see all PCI recommended preprint in biorXiv by following this link


4- Install the PubPeer browser extension ( in your preferred web browser. In Google ScholarGoogle, and bioRxiv, just check the green banner. In Zenodo, you have to go on the article page to check the green banner in the “Cite as” section.

Our advice: Install the PubPeer browser extension ( in your preferred web browser, use it and check the green banner!


screenshot of google scholar and biorxiv seach results with the green flag of PubPeer


Screenshot of Google Scholar and bioRxiv search results with the green flag of PubPeer.

The PubPeer extension does not work yet in arXiv, in the result page of Europe PMC or Zenodo, in OSF Preprint, or in PrePubmed. But it works in Pubmed, in Web of Science, and in most journal websites. It also works in the reference manager Zotero. In Hal, the preprints recommended by a PCI will soon be tagged.

5- If the articles are bioRxiv preprints then you can use a new platform: . It gathers in the same place preprints (of bioRxiv), reviews and endorsements from different communities of editors and reviewers, including PCI. Early evidence base also gathers preprints and reviews.