peerage of science
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Peerage of Science is a free, portable peer review service that gives initial feedback on manuscripts within 2-3 weeks of submission (and then final feedback after resubmission). Some journals have stated that they officially welcome reviews from Peerage of Science, including BMC Genomics, PLOS Biology, and PLOS One, although they reserve the right to conduct their own round of peer reviews in addition.
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https://www.peerageofscience.org/how-it-works/
https://www.peerageofscience.org/how-it-works/overview/
https://www.peerageofscience.org/review/review-examples/