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CrowdPeer is a platform for the open review of preprints where academics from diverse backgrounds can come together to discuss the merits and deficiencies of the latest research.

How do you find a preprint?

We currently index preprints from bioRxiv and medRxiv. You can find them on the feed page. Here, you can also filter the preprints by subject area and sort them by most recent or most actively commented on.

Don't see the preprint you're looking for?

Let us know! Use the suggest a paper form on the feed page to provide a DOI or title and we will do our best to get the preprint indexed. We will let you know when the preprint has been added.

Tracking Review Progress

The review progress panel on each preprint page quickly shows you how the review is going; see the number of reviewers and the different comments made. You can also bookmark the paper to make it easy to come back to later.

Making a Comment

To add a comment, use the add comment button on a preprint page. Choose the comment category, provide a comment title to quickly summarise your contribution and add your comment.
Comments on CrowdPeer are divided into four categories:

  • Summaries are used to provide a brief overview of the work or comment on its wider impact.
  • Strengths are used to highlight areas of the research done well. 
  • Major issues describe fundamental problems with the research that need addressing. 
  • Minor issues are flaws in the research that should also be addressed but do not affect the overall conclusions of the work.

When leaving a comment, make sure it adheres to the CrowdPeercode of conduct


The voting system is used to identify the most valuable contributions and make sure they rise to the top.  Comment voting is essential to the CrowdPeer platform and makes the experience most useful for everyone.  It is valuable for:

  • Authors - it helps authors to understand what the community thinks are the most important comments.
  • The community - for those reading the preprint, it helps them to more quickly understand the strengths and shortcomings of the research.
  • You - the voting system indicates how much value you bring to the community.


You should upvote any contributions you believe raise valuable points about the research.  By upvoting you make it more likely that the comment is seen.


Downvoting should be used to mark a comment you think is incorrect. To discourage simple dismissal of comments we ask that you give a reason for your downvote by writing a reply.  This is valuable for the original commenter as well as others engaged with the discussion.  If you don’t disagree with a comment, but don’t think it is useful, you should not vote on that comment.  If you think a comment is offensive you should use the flag button.


Your reputation is awarded to you by your peers and is a direct measure of the value you bring to the community.  You can start voting on others contributions after you have left your first comment or replied to a comment on CrowdPeer. Your reputation starts at 0, and is built as follows:

  • +10 for receiving an upvote
  • +5 for receiving an upvote on a comment reply
  • -2 for receiving a downvote on a comments
  • -1 for receiving a downvote on a comment reply

Downvotes are weighted differently to upvotes to encourage commentary wherever possible.  You should not be discouraged from commenting for fear of being downvoted.