Peer code review: do you do it? what you use?

For a few last days an idea about peer code review tool is living in my head. The story is simple.<p>I have a startup and a team is growing pretty fast. To keep up a good quality of code we need to review the code but I didn't find a tool that is simple and intuitive (and in the cloud).<p>There are some solutions from Atlassian and SmartBear but they are too complex (I believe) and expensive for a startup. There are also some free and open source tools that looks like open source tools - ugly and non-intuitive (like Rietveld). ReviewBoars seems to be the best but is still not that I was looking for.<p>In addition to that there are built-in "comments on commits" functions at GitHub and BitBucket that can be used as code review tool.<p>So, my question is do we need one more tool that will be different from what I described? Main points are: - simple to jump in - cloud based - interactive and real time - seamless integration with GitHub and BitBucket - cheap for a startup<p>Do you think startups and small/mid-size companies need this? Do you think it will get some traction? Does it solve a real problem? What are the most important features if it does?<p>Appreciate your thoughts.