diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -12,7 +12,7 @@
     'core.pkg.css' => '12c56bd9',
     'core.pkg.js' => '1fa7c0c5',
     'darkconsole.pkg.js' => 'e7393ebb',
-    'differential.pkg.css' => '4815647b',
+    'differential.pkg.css' => '90b30783',
     'differential.pkg.js' => 'ddfeb49b',
     'diffusion.pkg.css' => '91c5d3a6',
     'diffusion.pkg.js' => '84c8f8fd',
@@ -58,7 +58,7 @@
     'rsrc/css/application/dashboard/dashboard.css' => '0921c307',
     'rsrc/css/application/diff/inline-comment-summary.css' => '51efda3a',
     'rsrc/css/application/differential/add-comment.css' => 'c47f8c40',
-    'rsrc/css/application/differential/changeset-view.css' => '6a9bdf9c',
+    'rsrc/css/application/differential/changeset-view.css' => '41af6d25',
     'rsrc/css/application/differential/core.css' => '5b7b8ff4',
     'rsrc/css/application/differential/phui-inline-comment.css' => 'be663c95',
     'rsrc/css/application/differential/revision-comment.css' => '14b8565a',
@@ -572,7 +572,7 @@
     'conpherence-thread-manager' => 'c8b5ee6f',
     'conpherence-transaction-css' => '85129c68',
     'd3' => 'a11a5ff2',
-    'differential-changeset-view-css' => '6a9bdf9c',
+    'differential-changeset-view-css' => '41af6d25',
     'differential-core-view-css' => '5b7b8ff4',
     'differential-inline-comment-editor' => '2e3f9738',
     'differential-revision-add-comment-css' => 'c47f8c40',
@@ -1166,6 +1166,9 @@
       'javelin-dom',
       'javelin-reactor-dom',
     ),
+    '41af6d25' => array(
+      'phui-inline-comment-view-css',
+    ),
     42126667 => array(
       'javelin-behavior',
       'javelin-dom',
@@ -1386,9 +1389,6 @@
     '69adf288' => array(
       'javelin-install',
     ),
-    '6a9bdf9c' => array(
-      'phui-inline-comment-view-css',
-    ),
     '6ad39b6f' => array(
       'javelin-install',
       'javelin-event',
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -235,6 +235,7 @@
     'CelerityPhysicalResourcesTestCase' => 'applications/celerity/resources/__tests__/CelerityPhysicalResourcesTestCase.php',
     'CelerityPostprocessor' => 'applications/celerity/postprocessor/CelerityPostprocessor.php',
     'CelerityPostprocessorTestCase' => 'applications/celerity/__tests__/CelerityPostprocessorTestCase.php',
+    'CelerityRedGreenPostprocessor' => 'applications/celerity/postprocessor/CelerityRedGreenPostprocessor.php',
     'CelerityResourceController' => 'applications/celerity/controller/CelerityResourceController.php',
     'CelerityResourceGraph' => 'applications/celerity/CelerityResourceGraph.php',
     'CelerityResourceMap' => 'applications/celerity/CelerityResourceMap.php',
@@ -4911,6 +4912,7 @@
     'CelerityPhysicalResourcesTestCase' => 'PhabricatorTestCase',
     'CelerityPostprocessor' => 'Phobject',
     'CelerityPostprocessorTestCase' => 'PhabricatorTestCase',
+    'CelerityRedGreenPostprocessor' => 'CelerityPostprocessor',
     'CelerityResourceController' => 'PhabricatorController',
     'CelerityResourceGraph' => 'AbstractDirectedGraph',
     'CelerityResourceMap' => 'Phobject',
diff --git a/src/applications/celerity/postprocessor/CelerityDefaultPostprocessor.php b/src/applications/celerity/postprocessor/CelerityDefaultPostprocessor.php
--- a/src/applications/celerity/postprocessor/CelerityDefaultPostprocessor.php
+++ b/src/applications/celerity/postprocessor/CelerityDefaultPostprocessor.php
@@ -193,10 +193,10 @@
       'sh-disabledbackground'   => '#f3f3f3',
 
       // Diffs
-      'new-background' => '#eaffea',
-      'new-bright' => '#a6f3a6',
-      'old-background' => '#ffecec',
-      'old-bright' => '#f8cbcb',
+      'new-background' => 'rgba(151, 234, 151, .3)',
+      'new-bright' => 'rgba(151, 234, 151, .6)',
+      'old-background' => 'rgba(251, 175, 175, .3)',
+      'old-bright' => 'rgba(251, 175, 175, .7)',
       'move-background' => '#fdf5d4',
       'copy-background' => '#f1c40f',
 
diff --git a/src/applications/celerity/postprocessor/CelerityRedGreenPostprocessor.php b/src/applications/celerity/postprocessor/CelerityRedGreenPostprocessor.php
new file mode 100644
--- /dev/null
+++ b/src/applications/celerity/postprocessor/CelerityRedGreenPostprocessor.php
@@ -0,0 +1,23 @@
+<?php
+
+final class CelerityRedGreenPostprocessor
+  extends CelerityPostprocessor {
+
+  public function getPostprocessorKey() {
+    return 'redgreen';
+  }
+
+  public function getPostprocessorName() {
+    return pht('Use Red/Green (Deuteranopia) Colors');
+  }
+
+  public function buildVariables() {
+    return array(
+      'new-background' => 'rgba(152, 207, 235, .15)',
+      'new-bright' => 'rgba(152, 207, 235, .35)',
+      'old-background' => 'rgba(250, 212, 175, .3)',
+      'old-bright' => 'rgba(250, 212, 175, .55)',
+    );
+  }
+
+}
diff --git a/src/applications/differential/render/DifferentialChangesetOneUpMailRenderer.php b/src/applications/differential/render/DifferentialChangesetOneUpMailRenderer.php
--- a/src/applications/differential/render/DifferentialChangesetOneUpMailRenderer.php
+++ b/src/applications/differential/render/DifferentialChangesetOneUpMailRenderer.php
@@ -51,6 +51,10 @@
   protected function renderPrimitives(array $primitives, $rows) {
     $out = array();
 
+    $viewer = $this->getUser();
+    $old_bright = $viewer->getCSSValue('old-bright');
+    $new_bright = $viewer->getCSSValue('new-bright');
+
     $context_style = array(
       'background: #F7F7F7;',
       'color: #74777D;',
@@ -72,13 +76,13 @@
 
           if ($is_old) {
             if ($p['htype']) {
-              $style = 'background: #ffd0d0;';
+              $style = "background: {$old_bright};";
             } else {
               $style = null;
             }
           } else {
             if ($p['htype']) {
-              $style = 'background: #d0ffd0;';
+              $style = "background: {$new_bright};";
             } else {
               $style =  null;
             }
diff --git a/src/applications/people/storage/PhabricatorUser.php b/src/applications/people/storage/PhabricatorUser.php
--- a/src/applications/people/storage/PhabricatorUser.php
+++ b/src/applications/people/storage/PhabricatorUser.php
@@ -1580,4 +1580,22 @@
     return $this;
   }
 
+
+  public function getCSSValue($variable_key) {
+    $preference = PhabricatorAccessibilitySetting::SETTINGKEY;
+    $key = $this->getUserSetting($preference);
+
+    $postprocessor = CelerityPostprocessor::getPostprocessor($key);
+    $variables = $postprocessor->getVariables();
+
+    if (!isset($variables[$variable_key])) {
+      throw new Exception(
+        pht(
+          'Unknown CSS variable "%s"!',
+          $variable_key));
+    }
+
+    return $variables[$variable_key];
+  }
+
 }
diff --git a/src/applications/transactions/view/PhabricatorApplicationTransactionTextDiffDetailView.php b/src/applications/transactions/view/PhabricatorApplicationTransactionTextDiffDetailView.php
--- a/src/applications/transactions/view/PhabricatorApplicationTransactionTextDiffDetailView.php
+++ b/src/applications/transactions/view/PhabricatorApplicationTransactionTextDiffDetailView.php
@@ -19,17 +19,21 @@
   public function renderForMail() {
     $diff = $this->buildDiff();
 
+    $viewer = $this->getViewer();
+    $old_bright = $viewer->getCSSValue('old-bright');
+    $new_bright = $viewer->getCSSValue('new-bright');
+
     $old_styles = array(
       'padding: 0 2px;',
       'color: #333333;',
-      'background: #f8cbcb;',
+      "background: {$old_bright};",
     );
     $old_styles = implode(' ', $old_styles);
 
     $new_styles = array(
       'padding: 0 2px;',
       'color: #333333;',
-      'background: #a6f3a6;',
+      "background: {$new_bright};",
     );
     $new_styles = implode(' ', $new_styles);