You've found the right code review tool
Thorough
Tracks where participants stand on each discussion, ensuring it won't disappear until resolved. Fully customizable logic determines when a review is complete.
Efficient
Clearly shows net deltas since last time you looked, even if commits got rebased or amended. Batches comments and correctly threads email responses.
Focused
Works only with GitHub and GitHub Enterprise, making for a seamless integration. Minimal admin busywork, no extra fluff — just awesome code reviews.
What are others saying?
“It seems that the tools for code review in GitHub are not great, to put it lightly. Not great at all.”
—Jaime Buelta
BTW Reviewable is really awesome.
After using it for a few reviews now, I hate going back to GitHub.
After using it for a few reviews now, I hate going back to GitHub.
Nicolas Artman
Frontend Engineering Lead, Udacity
Frontend Engineering Lead, Udacity
I've gotta say—Reviewable is the best damn code-review tool out there.
Super slick, silky-smooth integration into GitHub. Love it.
Super slick, silky-smooth integration into GitHub. Love it.
Danny Kopping
Senior PHP Developer, Zando
Senior PHP Developer, Zando
Just did my first code review on Reviewable. Very well done!
Thanks for bringing this to the developers of this world!
Thanks for bringing this to the developers of this world!
Holger Rapp
Senior Software Engineer, Google
Senior Software Engineer, Google
Reviewable is working really well for us so far. We’re migrating from a self-hosted Gerrit installation and Reviewable gives us most if not all of the benefits while integrating much better with the GitHub workflow developers are used to.
Jay Stotz
Co-founder & CTO at Springboard Retail
Co-founder & CTO at Springboard Retail
Reviewable is freaking awesome, BTW. 
I'm a Xoogler myself, and I feel right at home.
I'm a Xoogler myself, and I feel right at home.
Austin McDonald
Software Engineer, Seed
Software Engineer, Seed
Not convinced yet? Here's some more features
Instantly diff any two revisions of a file, in unified or side-by-side style. Hide minor changes: whitespace, merge, and rebase deltas.
Customize margin, fonts, colors, keyboard shortcuts, etc. Jump from a comment straight to the right spot in your favorite editor.
Line comments map across file revisions and stay in place until resolved, not just until changes are pushed.
Modern, clean UI with a touch of whimsy. Full contextual help and fast support if you have questions.
Keep track of who reviewed which revision of each file to make sure no changes are missed. Combine commits or review each one.
SSO with GitHub account — no separate accounts to manage. All your code stays on GitHub, never touching our servers.