Reviews are sourced from mangrove.reviews, and are open data licensed under creative commons. As Comaps is the first major app to support displaying the reviews they are still a bit lacking in numbers. Feel free to help change that!

It's not possible to review places from Comaps directly: a link to add reviews will be added in the next version. For now, the best way to review places is to find them on MapComplete (where restaurants and cafés/pubs are listed separately).

This is the first step towards review integration in comaps, and they are still working on features such as incorporating reviews into search results. So it'll keep getting better, but for now seeing scores and reading reviews works great. As a bonus all reviews are available offline.