diff --git a/vidgrid.app/vidgrid b/vidgrid.app/vidgrid
new file mode 100755
index 0000000..94483c4
--- /dev/null
+++ b/vidgrid.app/vidgrid
@@ -0,0 +1,99 @@
+#!/usr/bin/env lua
+
+-- 1. CONFIGURATION
+
+screen_width = 1080 -- FIXME
+aspect_ratio = 1.5 -- a good default for dragonframe's typical 1620x1080 exports
+menubar_height = 39
+
+
+-- 2. UTILITY FUNCTIONS
+
+function exec(cmd)
+  local handle = io.popen(cmd)
+  local result = handle:read("*a")
+  handle:close()
+  result = result:sub(1, #result - 1) -- remove trailing newline
+  return result
+end
+
+function linesToTable(s)
+  local t = {}
+  for x in string.gmatch(s, "([^%s]+)") do
+    table.insert(t, x)
+  end
+  return t
+end
+
+-- 3. COUNT WINDOWS + SET UP GRID
+
+number_of_windows = tonumber(exec("osascript -e 'tell application \"System Events\" to count (windows of process \"QuickTime Player\" where value of attribute \"AXMinimized\" is false)'"))
+print("There are currently "..number_of_windows.." non-minimized QuickTime windows")
+
+-- FIXME:
+if number_of_windows <= 9 then
+  cols = 3
+  rows = 3
+elseif number_of_windows <= 12 then
+  cols = 3
+  rows = 4
+elseif number_of_windows <= 16 then
+  cols = 4
+  rows = 4
+elseif number_of_windows <= 20 then
+  cols = 4
+  rows = 5
+elseif number_of_windows <= 25 then
+  cols = 5
+  rows = 5
+elseif number_of_windows <= 30 then
+  cols = 5
+  rows = 6
+elseif number_of_windows <= 36 then
+  cols = 6
+  rows = 6
+else
+  os.execute("osascript -e 'display dialog \"you have too many videos lol\"'")
+  os.exit()
+end
+
+video_width = screen_width // cols -- "floor division" returns an integer
+video_height = video_width // aspect_ratio
+
+
+-- 4. PLAY + POSITION VIDEOS
+
+-- For each QuickTime window we will:
+-- 1. use AppleScript to play it on loop
+-- 2. move it to the appropriate position
+
+current_col = 1
+current_row = 1
+for i = 1, number_of_windows do
+  -- Calculate position / dimensions
+  local x1 = (current_col * video_width) - video_width
+  local y1 = (current_row * video_height) - video_height + menubar_height
+  local x2 = x1 + video_width
+  local y2 = y1 + video_height
+  local bounds = string.format("{%d, %d, %d, %d}", x1, y1, x2, y2)
+  print(string.format("row %s, col %s: %s", current_row, current_col, bounds))
+
+  -- Loop
+  local loopCmd = string.format('tell application "QuickTime Player" to set the looping of document %d to true', i)
+  os.execute("osascript -e '"..loopCmd.."'")
+
+  -- Play
+  local playCmd = string.format('tell application "QuickTime Player" to play document %d', i)
+  os.execute("osascript -e '"..playCmd.."'")
+
+  -- Move
+  local moveCmd = string.format('tell application "QuickTime Player" to set the bounds of window %d to %s', i, bounds)
+  os.execute("osascript -e '"..moveCmd.."'")
+
+  -- Update grid positioning for the next iteration
+  current_col = current_col + 1
+  if current_col > cols then
+    current_col = 1
+    current_row = current_row + 1
+  end
+end