The essence of peer-review journals is of course the peer-review process. That is a review performed by (anonymous) reviewers, post-submission. Which is: after you submit your paper to a journal.
What Peerwith offers is Manuscript review service, pre-submission. The academic peer review process can take months, only for you to potentially hear your paper was rejected for easily-avoidable reasons. At Peerwith, experts can check your paper pre-submission and advise on whether it is ready for publication.
Use the Peerwith Manuscript review service to get an early go / no-go decision advice from experts on whether your manuscript is ready for publication. Don't confuse this with a more traditional peer review which is part of the process after you submit to a journal.