diff --git a/libs/api.lua b/api/api.lua
similarity index 100%
rename from libs/api.lua
rename to api/api.lua
diff --git a/libs/config.lua b/api/config.lua
similarity index 100%
rename from libs/config.lua
rename to api/config.lua
diff --git a/libs/ui-widgets.lua b/api/ui-widgets.lua
similarity index 100%
rename from libs/ui-widgets.lua
rename to api/ui-widgets.lua
diff --git a/libs/unitframes.lua b/api/unitframes.lua
similarity index 100%
rename from libs/unitframes.lua
rename to api/unitframes.lua
diff --git a/modules/unusable.lua b/modules/unusable.lua
new file mode 100644
index 00000000..65ae0ff4
--- /dev/null
+++ b/modules/unusable.lua
@@ -0,0 +1,81 @@
+pfUI:RegisterModule("unusable", function ()
+  if not pfUI.bag then return end
+
+  pfUI.unusable = CreateFrame("Frame")
+  pfUI.unusable:RegisterEvent("PLAYER_LEVEL_UP")
+  pfUI.unusable:RegisterEvent("SKILL_LINES_CHANGED")
+  pfUI.unusable:RegisterEvent("ITEM_LOCK_CHANGED")
+  pfUI.unusable:RegisterEvent("ACTIONBAR_HIDEGRID")
+  pfUI.unusable:RegisterEvent("PLAYERBANKSLOTS_CHANGED")
+  pfUI.unusable:RegisterEvent("BANKFRAME_OPENED")
+  pfUI.unusable.cache = {}
+
+  local scanner = libtipscan:GetScanner("unusable")
+  local dura_capture = string.gsub(DURABILITY_TEMPLATE, "%%[^%s]+", "(.+)")
+
+  function pfUI.unusable:UpdateSlot(bag, slot)
+    local frame = pfUI.bags[bag].slots[slot].frame
+    self.cache[bag] = self.cache[bag] or {}
+    if frame.hasItem then
+      if bag == BANK_CONTAINER then
+        scanner:SetInventoryItem("player", 39+slot)
+      else
+        scanner:SetBagItem(bag, slot)
+      end
+      local name = frame:GetName()
+      local red_line = scanner:Color(RED_FONT_COLOR)
+      if red_line then
+        local left = scanner:Line(red_line)
+        local _,_, is_durability = string.find(left,dura_capture,1)
+        if not is_durability then
+          _G.SetItemButtonTextureVertexColor(_G[name], 0.9, 0, 0)
+          self.cache[bag][slot] = true
+        end
+      else
+        self.cache[bag][slot] = false
+      end
+    else
+      if self.cache[bag][slot] then
+        self.cache[bag][slot] = false
+      end
+    end
+  end
+
+  function pfUI.unusable:UpdateCache()
+    local self = self or pfUI.unusable
+    for bag,slots in pairs(self.cache) do
+      for slot,status in pairs(slots) do
+        if status then
+          pfUI.bag:UpdateSlot(bag, slot)
+        end
+      end
+    end
+  end
+
+  function pfUI.unusable:DumpCache()
+    local self = self or pfUI.unusable
+    for bag,slots in pairs(self.cache) do
+      for slot, status in pairs(slots) do
+        if status then
+          print(string.format("bag:%s, slot:%s",bag,slot))
+        end
+      end
+    end
+  end
+
+  pfUI.unusable:SetScript("OnEvent", function()
+    if event == "PLAYERBANKSLOTS_CHANGED" or event == "BANKFRAME_OPENED" then
+      QueueFunction(this.UpdateCache,this) -- BankFrameItemButton_OnUpdate fires after UpdateSlot overriding changes
+    else
+      this:UpdateCache()
+    end
+  end)
+
+  -- manual post hook update slot, hooksecurefunc won't work; _G[] doesn't like keys with periods.
+  local bagUpdateSlot = pfUI.bag.UpdateSlot
+  pfUI.bag.UpdateSlot = function(_, bag, slot)
+    bagUpdateSlot(pfUI.bag, bag, slot)
+    pfUI.unusable:UpdateSlot(bag, slot)
+  end
+
+end)
diff --git a/pfUI.toc b/pfUI.toc
index dd513038..cba7b53c 100644
--- a/pfUI.toc
+++ b/pfUI.toc
@@ -102,3 +102,4 @@ modules\easteregg.lua
 modules\farmmode.lua
 modules\pettarget.lua
 modules\mapreveal.lua
+modules\unusable.lua