* Shows you what changed since last time you looked. Even across multiple commits, merging, or rebasing. In beautiful, responsive, one- or two-column diffs. * Manages comments so your inbox doesn't overflow. Send comments in batches to structure the review process. Never miss a comment or have it mysteriously disappear. * Integrates effortlessly with GitHub pull requests. No new commands to learn, no separate repos to sync, no servers to set up. Live updates. Two clicks to set up. * See only what changed since last time you looked (even if rebased). * Instantly diff any two revisions of a file, in one or two columns. * Hide spurious whitespace-only, merge, or rebase deltas. * Send all comments in one batch, or one at a time. * Auto-saves drafts to server—resume your review anywhere. * Fully supports GitHub-flavored Markdown. * Customize code font/highlighting, key bindings, max line length. * Write rules for review completion, and post status to GitHub. * Open files on the right line directly in your favorite editor. * Tracks reviewed files, unreplied / unresolved comments. * Comments map across code changes, never disappear. * Live updates: don't waste time on outdated commits or comments. * Most of the power of heavier tools with a simple, clean UI. * Convenient dashboard of all your in-progress reviews. * Full contextual help and fast support if you run into issues. * Works with any repo where you can create a pull request. * Uses GitHub's permissions: no separate accounts or ACLs. * All your code and comments stay on GitHub—leave any time.

* Easy collaboration: Participate in discussions, @mention other users, share everything with a URL, including code, revisions, diffs, code reviews, search filters, files, and even code selections. * Top-notch integrations: Upsource integrates with GitHub, popular issue trackers such as JIRA and YouTrack, and CI servers. It also features IDE plugin that allows developers participate in code reviews from their IDE. * Repository browsing: Enjoy unified access to all your Git, Mercurial, Perforce or Subversion projects. Our powerful search engine lets you quickly find what you're looking for. * Analytics: Upsource gathers VCS usage and code review statistics, and provides a number of reports for a bird's-eye view of what's going on in your projects. * Your data is safe: Take advantage of advanced user management, granular and per-project permissions, and multiple authentication modules.