diff --git a/builds/4chan-X.js b/builds/4chan-X.js
index b84eeecca..0a89a9342 100644
--- a/builds/4chan-X.js
+++ b/builds/4chan-X.js
@@ -102,7 +102,7 @@
 * this notice is kept intact.
 */
 (function() {
-  var $, $$, Anonymize, ArchiveLink, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, Header, ImageExpand, ImageHover, ImageReplace, Keybinds, Linkify, Main, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, RemoveSpoilers, Report, ReportLink, RevealSpoilers, Sauce, Settings, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, g,
+  var $, $$, Anonymize, ArchiveLink, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, Header, IDColor, ImageExpand, ImageHover, ImageReplace, Keybinds, Linkify, Main, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, RemoveSpoilers, Report, ReportLink, RevealSpoilers, Sauce, Settings, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, g,
     __slice = [].slice,
     __hasProp = {}.hasOwnProperty,
     __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
@@ -126,6 +126,7 @@
         'Reply Navigation': [false, 'Add buttons to navigate to top / bottom of thread.'],
         'Check for Updates': [true, 'Check for updated versions of 4chan X.'],
         'Emoji': [false, 'Adds icons next to names for different emails'],
+        'Color User IDs': [false, 'Assign unique colors to user IDs on boards that use them'],
         'Remove Spoilers': [false, 'Remove all spoilers in text.'],
         'Indicate Spoilers': [false, 'Indicate spoilers if Remove Spoilers is enabled.']
       },
@@ -4337,6 +4338,57 @@
     }
   };
 
+  IDColor = {
+    init: function() {
+      if (!Conf['Color User IDs']) {
+        return;
+      }
+      return Post.prototype.callbacks.push({
+        name: 'Reveal Spoilers',
+        cb: this.node
+      });
+    },
+    node: function(post) {
+      var str, uid;
+
+      if (!(uid = $('.hand', this.nodes.uniqueID))) {
+        return;
+      }
+      str = this.info.uniqueID;
+      if (uid.nodeName === 'SPAN') {
+        return uid.style.cssText = IDColor.apply.call(str);
+      }
+    },
+    ids: {},
+    compute: function(str) {
+      var hash, rgb;
+
+      hash = this.hash(str);
+      rgb = [(hash >> 24) & 0xFF, (hash >> 16) & 0xFF, (hash >> 8) & 0xFF];
+      rgb[3] = ((rgb[0] * 0.299) + (rgb[1] * 0.587) + (rgb[2] * 0.114)) > 125;
+      this.ids[str] = rgb;
+      return rgb;
+    },
+    apply: function() {
+      var rgb;
+
+      rgb = IDColor.ids[this] || IDColor.compute(this);
+      return ("background-color: rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "); color: ") + (rgb[3] ? "black;" : "white;");
+    },
+    hash: function(str) {
+      var i, j, msg;
+
+      msg = 0;
+      i = 0;
+      j = str.length;
+      while (i < j) {
+        msg = ((msg << 5) - msg) + str.charCodeAt(i);
+        ++i;
+      }
+      return msg;
+    }
+  };
+
   Emoji = {
     init: function() {
       var css, icon, name, pos, _ref;
@@ -9468,6 +9520,7 @@
         'Announcement Hiding': PSAHiding,
         'Fourchan thingies': Fourchan,
         'Emoji': Emoji,
+        'Color User IDs': IDColor,
         'Remove Spoilers': RemoveSpoilers,
         'Custom CSS': CustomCSS,
         'Linkify': Linkify,
diff --git a/builds/4chan-X.user.js b/builds/4chan-X.user.js
index 526354338..c506ce813 100644
--- a/builds/4chan-X.user.js
+++ b/builds/4chan-X.user.js
@@ -102,7 +102,7 @@
 * this notice is kept intact.
 */
 (function() {
-  var $, $$, Anonymize, ArchiveLink, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, Header, ImageExpand, ImageHover, ImageReplace, Keybinds, Linkify, Main, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, RemoveSpoilers, Report, ReportLink, RevealSpoilers, Sauce, Settings, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, g,
+  var $, $$, Anonymize, ArchiveLink, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, Header, IDColor, ImageExpand, ImageHover, ImageReplace, Keybinds, Linkify, Main, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, RemoveSpoilers, Report, ReportLink, RevealSpoilers, Sauce, Settings, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, g,
     __slice = [].slice,
     __hasProp = {}.hasOwnProperty,
     __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
@@ -126,6 +126,7 @@
         'Reply Navigation': [false, 'Add buttons to navigate to top / bottom of thread.'],
         'Check for Updates': [true, 'Check for updated versions of 4chan X.'],
         'Emoji': [false, 'Adds icons next to names for different emails'],
+        'Color User IDs': [false, 'Assign unique colors to user IDs on boards that use them'],
         'Remove Spoilers': [false, 'Remove all spoilers in text.'],
         'Indicate Spoilers': [false, 'Indicate spoilers if Remove Spoilers is enabled.']
       },
@@ -4328,6 +4329,57 @@
     }
   };
 
+  IDColor = {
+    init: function() {
+      if (!Conf['Color User IDs']) {
+        return;
+      }
+      return Post.prototype.callbacks.push({
+        name: 'Reveal Spoilers',
+        cb: this.node
+      });
+    },
+    node: function(post) {
+      var str, uid;
+
+      if (!(uid = $('.hand', this.nodes.uniqueID))) {
+        return;
+      }
+      str = this.info.uniqueID;
+      if (uid.nodeName === 'SPAN') {
+        return uid.style.cssText = IDColor.apply.call(str);
+      }
+    },
+    ids: {},
+    compute: function(str) {
+      var hash, rgb;
+
+      hash = this.hash(str);
+      rgb = [(hash >> 24) & 0xFF, (hash >> 16) & 0xFF, (hash >> 8) & 0xFF];
+      rgb[3] = ((rgb[0] * 0.299) + (rgb[1] * 0.587) + (rgb[2] * 0.114)) > 125;
+      this.ids[str] = rgb;
+      return rgb;
+    },
+    apply: function() {
+      var rgb;
+
+      rgb = IDColor.ids[this] || IDColor.compute(this);
+      return ("background-color: rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "); color: ") + (rgb[3] ? "black;" : "white;");
+    },
+    hash: function(str) {
+      var i, j, msg;
+
+      msg = 0;
+      i = 0;
+      j = str.length;
+      while (i < j) {
+        msg = ((msg << 5) - msg) + str.charCodeAt(i);
+        ++i;
+      }
+      return msg;
+    }
+  };
+
   Emoji = {
     init: function() {
       var css, icon, name, pos, _ref;
@@ -9486,6 +9538,7 @@
         'Announcement Hiding': PSAHiding,
         'Fourchan thingies': Fourchan,
         'Emoji': Emoji,
+        'Color User IDs': IDColor,
         'Remove Spoilers': RemoveSpoilers,
         'Custom CSS': CustomCSS,
         'Linkify': Linkify,
diff --git a/builds/crx/script.js b/builds/crx/script.js
index 9150c050f..3b34a77e5 100644
--- a/builds/crx/script.js
+++ b/builds/crx/script.js
@@ -1,5 +1,5 @@
 (function() {
-  var $, $$, Anonymize, ArchiveLink, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, Header, ImageExpand, ImageHover, ImageReplace, Keybinds, Linkify, Main, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, RemoveSpoilers, Report, ReportLink, RevealSpoilers, Sauce, Settings, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, g,
+  var $, $$, Anonymize, ArchiveLink, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, Header, IDColor, ImageExpand, ImageHover, ImageReplace, Keybinds, Linkify, Main, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, RemoveSpoilers, Report, ReportLink, RevealSpoilers, Sauce, Settings, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, g,
     __slice = [].slice,
     __hasProp = {}.hasOwnProperty,
     __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
@@ -23,6 +23,7 @@
         'Reply Navigation': [false, 'Add buttons to navigate to top / bottom of thread.'],
         'Check for Updates': [true, 'Check for updated versions of 4chan X.'],
         'Emoji': [false, 'Adds icons next to names for different emails'],
+        'Color User IDs': [false, 'Assign unique colors to user IDs on boards that use them'],
         'Remove Spoilers': [false, 'Remove all spoilers in text.'],
         'Indicate Spoilers': [false, 'Indicate spoilers if Remove Spoilers is enabled.']
       },
@@ -4192,6 +4193,57 @@
     }
   };
 
+  IDColor = {
+    init: function() {
+      if (!Conf['Color User IDs']) {
+        return;
+      }
+      return Post.prototype.callbacks.push({
+        name: 'Reveal Spoilers',
+        cb: this.node
+      });
+    },
+    node: function(post) {
+      var str, uid;
+
+      if (!(uid = $('.hand', this.nodes.uniqueID))) {
+        return;
+      }
+      str = this.info.uniqueID;
+      if (uid.nodeName === 'SPAN') {
+        return uid.style.cssText = IDColor.apply.call(str);
+      }
+    },
+    ids: {},
+    compute: function(str) {
+      var hash, rgb;
+
+      hash = this.hash(str);
+      rgb = [(hash >> 24) & 0xFF, (hash >> 16) & 0xFF, (hash >> 8) & 0xFF];
+      rgb[3] = ((rgb[0] * 0.299) + (rgb[1] * 0.587) + (rgb[2] * 0.114)) > 125;
+      this.ids[str] = rgb;
+      return rgb;
+    },
+    apply: function() {
+      var rgb;
+
+      rgb = IDColor.ids[this] || IDColor.compute(this);
+      return ("background-color: rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "); color: ") + (rgb[3] ? "black;" : "white;");
+    },
+    hash: function(str) {
+      var i, j, msg;
+
+      msg = 0;
+      i = 0;
+      j = str.length;
+      while (i < j) {
+        msg = ((msg << 5) - msg) + str.charCodeAt(i);
+        ++i;
+      }
+      return msg;
+    }
+  };
+
   Emoji = {
     init: function() {
       var css, icon, name, pos, _ref;
@@ -9329,6 +9381,7 @@
         'Announcement Hiding': PSAHiding,
         'Fourchan thingies': Fourchan,
         'Emoji': Emoji,
+        'Color User IDs': IDColor,
         'Remove Spoilers': RemoveSpoilers,
         'Custom CSS': CustomCSS,
         'Linkify': Linkify,
diff --git a/src/config.coffee b/src/config.coffee
index 42a19969d..3d17ac26c 100644
--- a/src/config.coffee
+++ b/src/config.coffee
@@ -61,6 +61,10 @@ Config =
         false
         'Adds icons next to names for different emails'
       ]
+      'Color User IDs': [
+        false
+        'Assign unique colors to user IDs on boards that use them'
+      ]
       'Remove Spoilers': [
         false
         'Remove all spoilers in text.'
diff --git a/src/features/misc/coloruserids.coffee b/src/features/misc/coloruserids.coffee
new file mode 100644
index 000000000..fe524d74f
--- /dev/null
+++ b/src/features/misc/coloruserids.coffee
@@ -0,0 +1,41 @@
+IDColor =
+  init: ->
+    return unless Conf['Color User IDs']
+
+    Post::callbacks.push
+      name: 'Reveal Spoilers'
+      cb:   @node
+
+  node: (post) ->
+    return unless uid = $ '.hand', @nodes.uniqueID
+    str = @info.uniqueID
+    if uid.nodeName is 'SPAN'
+      uid.style.cssText = IDColor.apply.call str
+
+  ids: {}
+
+  compute: (str) ->
+    hash = @hash str
+
+    rgb = [
+      (hash >> 24) & 0xFF
+      (hash >> 16) & 0xFF
+      (hash >> 8) & 0xFF
+    ]
+    rgb[3] = ((rgb[0] * 0.299) + (rgb[1] * 0.587) + (rgb[2] * 0.114)) > 125
+
+    @ids[str] = rgb
+    rgb
+
+  apply: ->
+    rgb = IDColor.ids[@] or IDColor.compute @
+    "background-color: rgb(#{rgb[0]},#{rgb[1]},#{rgb[2]}); color: " + if rgb[3] then "black;" else "white;"
+
+  hash: (str) ->
+    msg = 0
+    i = 0
+    j = str.length
+    while i < j
+      msg = ((msg << 5) - msg) + str.charCodeAt i
+      ++i
+    msg
\ No newline at end of file
diff --git a/src/main.coffee b/src/main.coffee
index ff5a69d11..d5a7fb58c 100644
--- a/src/main.coffee
+++ b/src/main.coffee
@@ -72,6 +72,7 @@ Main =
       'Announcement Hiding':      PSAHiding
       'Fourchan thingies':        Fourchan
       'Emoji':                    Emoji
+      'Color User IDs':           IDColor
       'Remove Spoilers':          RemoveSpoilers
       'Custom CSS':               CustomCSS
       'Linkify':                  Linkify