diff --git a/package.json b/package.json
index 019af4c..9d8a598 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
   "author": "John Beech",
   "license": "ISC",
   "dependencies": {
+    "deep-equal": "^2.0.5",
     "express": "^4.16.4",
     "pre-push": "*",
     "promise-path": "*",
diff --git a/solutions/day11/input.txt b/solutions/day11/input.txt
new file mode 100644
index 0000000..9ac13d4
--- /dev/null
+++ b/solutions/day11/input.txt
@@ -0,0 +1,98 @@
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diff --git a/solutions/day11/solution.js b/solutions/day11/solution.js
new file mode 100644
index 0000000..a6d132d
--- /dev/null
+++ b/solutions/day11/solution.js
@@ -0,0 +1,73 @@
+const path = require('path')
+const { read, position } = require('promise-path')
+const fromHere = position(__dirname)
+const report = (...messages) => console.log(`[${require(fromHere('../../package.json')).logName} / ${__dirname.split(path.sep).pop()}]`, ...messages)
+
+async function run () {
+  let input = (await read(fromHere('input.txt'), 'utf8')).trim().split('\n')
+  input = input.map(line => line.split(''))
+
+  await solveForFirstStar(input)
+  await solveForSecondStar(input)
+}
+
+function draw (input) {
+  for (const row of input) {
+    console.log(row.join(''))
+  }
+}
+
+function neighbors (input, row, col) {
+  let total = 0
+  if (input[row - 1]) {
+    if (input[row - 1][col - 1] === '#') total++
+    if (input[row - 1][col] === '#') total++
+    if (input[row - 1][col + 1] === '#') total++
+  }
+  if (input[row][col - 1] === '#') total++
+  if (input[row][col + 1] === '#') total++
+  if (input[row + 1]) {
+    if (input[row + 1][col - 1] === '#') total++
+    if (input[row + 1][col] === '#') total++
+    if (input[row + 1][col + 1] === '#') total++
+  }
+  return total
+}
+
+function step (input) {
+  const next = JSON.parse(JSON.stringify(input))
+  input.forEach((row, y, rows) => {
+    row.forEach((seat, x, seats) => {
+      if (seat === 'L' && neighbors(input, y, x) === 0) { next[y][x] = '#' }
+      if (seat === '#' && neighbors(input, y, x) >= 4) { next[y][x] = 'L' }
+    })
+  })
+  return next
+}
+
+function stabilize(input) {
+  // console.log('\nInput\n--------')
+  // draw(input)
+  let rounds = 1; let old; let fresh = input
+  do {
+    old = fresh
+    fresh = step(old)
+    // console.log(`\nRound ${rounds}\n--------`)
+    // draw(fresh)
+    rounds++
+  } while (JSON.stringify(old) !== JSON.stringify(fresh))
+  return fresh
+}
+
+async function solveForFirstStar (input) {
+  const stable = stabilize(input)
+  const filledSeats = stable.flat(2).filter(x => x=='#').length
+  report('Solution 1:', filledSeats)
+}
+
+async function solveForSecondStar (input) {
+  const solution = 'UNSOLVED'
+  report('Solution 2:', solution)
+}
+
+run()
diff --git a/solutions/day11/viewer.html b/solutions/day11/viewer.html
new file mode 100644
index 0000000..d583fae
--- /dev/null
+++ b/solutions/day11/viewer.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Solution Viewer</title>
+    <style>
+      html, body { font-family: sans-serif; }
+      pre { border-radius: 0.5em; padding: 0.5em; background: #eee; }
+    </style>
+    <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
+  </head>
+  <body>
+    <div id="viewer">
+      <h1>Solution Viewer ({{ solutionTitle }})</h1>
+      <p>For interesting problems; this page can be used as a dynamic viewer.</p>
+      <h3><a href="./input.txt">input.txt</a></h3>
+      <pre><code>{{ inputText }}</code></pre>
+      <h3><a href="./solution.js">solution.js</a></h3>
+      <pre><code>{{ solutionText }}</code></pre>
+    </div>
+    <script>
+const app = new Vue({
+  el: '#viewer',
+  data: () => {
+    return {
+      solutionText: '[Loading]',
+      inputText: '[Loading]'
+    }
+  },
+  computed: {
+    solutionTitle() {
+      const parts = (document.location + '').split('/')
+      return parts.reverse()[1]
+    }
+  },
+  async mounted () {
+    this.solutionText = (await axios.get('./solution.js')).data
+    this.inputText = (await axios.get('./input.txt')).data
+  }
+})
+    </script>
+  </body>
+</html>
\ No newline at end of file