diff --git a/rhodecode/controllers/compare.py b/rhodecode/controllers/compare.py
new file mode 100644
--- /dev/null
+++ b/rhodecode/controllers/compare.py
@@ -0,0 +1,133 @@
+# -*- coding: utf-8 -*-
+"""
+    rhodecode.controllers.compare
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    compare controller for pylons showoing differences between two
+    repos, branches, bookmarks or tips
+
+    :created_on: May 6, 2012
+    :author: marcink
+    :copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
+    :license: GPLv3, see COPYING for more details.
+"""
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+import logging
+import traceback
+
+from webob.exc import HTTPNotFound
+from pylons import request, response, session, tmpl_context as c, url
+from pylons.controllers.util import abort, redirect
+from pylons.i18n.translation import _
+
+from rhodecode.lib.vcs.exceptions import EmptyRepositoryError, RepositoryError
+from rhodecode.lib import helpers as h
+from rhodecode.lib.base import BaseRepoController, render
+from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
+from rhodecode.lib import diffs
+
+from rhodecode.model.db import Repository
+from rhodecode.model.pull_request import PullRequestModel
+
+log = logging.getLogger(__name__)
+
+
+class CompareController(BaseRepoController):
+
+    @LoginRequired()
+    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
+                                   'repository.admin')
+    def __before__(self):
+        super(CompareController, self).__before__()
+
+    def __get_cs_or_redirect(self, rev, repo, redirect_after=True):
+        """
+        Safe way to get changeset if error occur it redirects to changeset with
+        proper message
+
+        :param rev: revision to fetch
+        :param repo: repo instance
+        """
+
+        try:
+            type_, rev = rev
+            return repo.scm_instance.get_changeset(rev)
+        except EmptyRepositoryError, e:
+            if not redirect_after:
+                return None
+            h.flash(h.literal(_('There are no changesets yet')),
+                    category='warning')
+            redirect(url('summary_home', repo_name=repo.repo_name))
+
+        except RepositoryError, e:
+            log.error(traceback.format_exc())
+            h.flash(str(e), category='warning')
+            redirect(h.url('summary_home', repo_name=repo.repo_name))
+
+    def index(self, org_ref_type, org_ref, other_ref_type, other_ref):
+
+        org_repo = c.rhodecode_db_repo.repo_name
+        org_ref = (org_ref_type, org_ref)
+        other_ref = (other_ref_type, other_ref)
+        other_repo = request.GET.get('repo', org_repo)
+
+        c.swap_url = h.url('compare_url', repo_name=other_repo,
+              org_ref_type=other_ref[0], org_ref=other_ref[1],
+              other_ref_type=org_ref[0], other_ref=org_ref[1],
+              repo=org_repo)
+
+        c.org_repo = org_repo = Repository.get_by_repo_name(org_repo)
+        c.other_repo = other_repo = Repository.get_by_repo_name(other_repo)
+
+        if c.org_repo is None or c.other_repo is None:
+            log.error('Could not found repo %s or %s' % (org_repo, other_repo))
+            raise HTTPNotFound
+
+        if c.org_repo.scm_instance.alias != 'hg':
+            log.error('Review not available for GIT REPOS')
+            raise HTTPNotFound
+
+        self.__get_cs_or_redirect(rev=org_ref, repo=org_repo)
+        self.__get_cs_or_redirect(rev=other_ref, repo=other_repo)
+
+        c.cs_ranges, discovery_data = PullRequestModel().get_compare_data(
+                                       org_repo, org_ref, other_repo, other_ref
+                                      )
+
+        c.statuses = c.rhodecode_db_repo.statuses([x.raw_id for x in
+                                                   c.cs_ranges])
+        c.target_repo = c.repo_name
+        # defines that we need hidden inputs with changesets
+        c.as_form = request.GET.get('as_form', False)
+        if request.environ.get('HTTP_X_PARTIAL_XHR'):
+            return render('compare/compare_cs.html')
+
+        c.org_ref = org_ref[1]
+        c.other_ref = other_ref[1]
+        # diff needs to have swapped org with other to generate proper diff
+        _diff = diffs.differ(other_repo, other_ref, org_repo, org_ref,
+                             discovery_data)
+        diff_processor = diffs.DiffProcessor(_diff, format='gitdiff')
+        _parsed = diff_processor.prepare()
+
+        c.files = []
+        c.changes = {}
+
+        for f in _parsed:
+            fid = h.FID('', f['filename'])
+            c.files.append([fid, f['operation'], f['filename'], f['stats']])
+            diff = diff_processor.as_html(enable_comments=False, diff_lines=[f])
+            c.changes[fid] = [f['operation'], f['filename'], diff]
+
+        return render('compare/compare_diff.html')