diff --git a/src/index.html b/src/index.html
index 82accc3..575cefb 100644
--- a/src/index.html
+++ b/src/index.html
@@ -23,7 +23,7 @@
 						</svg>Run
 					</a>
 
-					<a id="js-add-library-btn" class="fleex-v-center hint--rounded hint--bottom-left" aria-label="Add a JS/CSS library">
+					<a id="js-add-library-btn" class="flex-v-center hint--rounded hint--bottom-left" aria-label="Add a JS/CSS library">
 						Add library <span id="js-external-lib-count" style="display:none;" class="count-label"></span>
 					</a>
 
@@ -101,6 +101,28 @@
 				</div>
 				<div class="demo-side" id="js-demo-side">
 					<iframe src="about://blank" frameborder="0" id="demo-frame"></iframe>
+					<div id="consoleEl" class="console is-minimized">
+						<div id="consoleLogEl" class="console__log" class="code">
+							<div class="js-console__header  code-wrap__header" title="Double click to toggle console">
+								<span class="code-wrap__header-label">Console (<span id="logCountEl">0</span>)</span>
+								<div class="code-wrap__header-right-options">
+									<a class="code-wrap__header-btn" title="Clear console (CTRL + L)" d-click="onClearConsoleBtnClick">
+										<svg>
+						  					<use xlink:href="#cancel-icon"></use>
+										</svg>
+									</a>
+									<a class="code-wrap__header-btn  code-wrap__collapse-btn" title="Toggle console" d-click="toggleConsole">
+									</a>
+								</div>
+							</div>
+						</div>
+						<div id="consolePromptEl" class="console__prompt flex flex-v-center">
+							<svg width="18" height="18" fill="#346fd2">
+		  						<use xlink:href="#chevron-icon"></use>
+		  					</svg>
+							<input d-keyup="evalConsoleExpr" class="console-exec-input">
+						</div>
+					</div>
 				</div>
 			</div>
 			<div class="footer">
@@ -224,7 +246,7 @@
 					<p>
 						<h3>Awesome libraries used</h3>
 						<ul>
-							<li><a target="_blank" href="http://kushagragour.in/lab/hint/">Hint.css</a> - By me :)</li>
+							<li><a target="_blank" href="https://kushagragour.in/lab/hint/">Hint.css</a> & <a target="_blank" href="https://github.com/chinchang/screenlog.js">Screenlog.js</a> - By me :)</li>
 							<li><a target="_blank" href="https://nathancahill.github.io/Split.js/">Split.js</a> - Nathan Cahill</li>
 							<li><a target="_blank" href="https://codemirror.net/">Codemirror</a> - Marijn Haverbeke</li>
 							<li><a target="_blank" href="https://emmet.io/">Emmet</a> - Sergey Chikuyonok</li>
@@ -577,6 +599,16 @@
 					<path d="M8,5.14V19.14L19,12.14L8,5.14Z" />
 				</svg>
 			</symbol>
+			<symbol id="cancel-icon" viewBox="0 0 24 24">
+				<svg>
+					<path d="M12,2A10,10 0 0,1 22,12A10,10 0 0,1 12,22A10,10 0 0,1 2,12A10,10 0 0,1 12,2M12,4A8,8 0 0,0 4,12C4,13.85 4.63,15.55 5.68,16.91L16.91,5.68C15.55,4.63 13.85,4 12,4M12,20A8,8 0 0,0 20,12C20,10.15 19.37,8.45 18.32,7.09L7.09,18.32C8.45,19.37 10.15,20 12,20Z" />
+				</svg>
+			</symbol>
+			<symbol id="chevron-icon" viewBox="0 0 24 24">
+				<svg>
+				<path d="M8.59,16.58L13.17,12L8.59,7.41L10,6L16,12L10,18L8.59,16.58Z" />
+				</svg>
+			</symbol>
 		</svg>
 
 		<script src="lib/codemirror/lib/codemirror.js"></script>
diff --git a/src/lib/screenlog.js b/src/lib/screenlog.js
new file mode 100644
index 0000000..8d9d67a
--- /dev/null
+++ b/src/lib/screenlog.js
@@ -0,0 +1,183 @@
+(function () {
+
+	var logEl,
+		isInitialized = false,
+		_console = {}; // backup console obj to contain references of overridden fns.
+		_options = {
+			bgColor: 'black',
+			logColor: 'lightgreen',
+			infoColor: 'blue',
+			warnColor: 'orange',
+			errorColor: 'red',
+			freeConsole: false,
+			css: '',
+			autoScroll: true,
+			proxyCallback: null,
+			noUi: false
+		};
+
+	function createElement(tag, css) {
+		var element = document.createElement(tag);
+		element.style.cssText = css;
+		return element;
+	}
+
+	function createPanel() {
+		var div = createElement('div', 'z-index:2147483647;font-family:Helvetica,Arial,sans-serif;font-size:10px;font-weight:bold;padding:5px;text-align:left;opacity:0.8;position:fixed;right:0;top:0;min-width:200px;max-height:50vh;overflow:auto;background:' + _options.bgColor + ';' + _options.css);
+		return div;
+	}
+
+	function genericLogger(color) {
+		return function() {
+			if (_options.proxyCallback) {
+				_options.proxyCallback.apply(null, arguments);
+			}
+			if (_options.noUi) { return; }
+			var el = createElement('div', 'line-height:18px;min-height:18px;background:' +
+				(logEl.children.length % 2 ? 'rgba(255,255,255,0.1)' : '') + ';color:' + color); // zebra lines
+			var val = [].slice.call(arguments).reduce(function(prev, arg) {
+				return prev + ' ' + (typeof arg === "object" ? JSON.stringify(arg) : arg);
+			}, '');
+			el.textContent = val;
+
+			logEl.appendChild(el);
+
+			// Scroll to last element, if autoScroll option is set.
+			if(_options.autoScroll) {
+				logEl.scrollTop = logEl.scrollHeight - logEl.clientHeight;
+			}
+		};
+	}
+
+	function clear() {
+		logEl.innerHTML = '';
+	}
+
+	function log() {
+		return genericLogger(_options.logColor).apply(null, arguments);
+	}
+
+	function info() {
+		return genericLogger(_options.infoColor).apply(null, arguments);
+	}
+
+	function warn() {
+		return genericLogger(_options.warnColor).apply(null, arguments);
+	}
+
+	function error() {
+		return genericLogger(_options.errorColor).apply(null, arguments);
+	}
+
+	function setOptions(options) {
+		for(var i in options)
+			if(options.hasOwnProperty(i) && _options.hasOwnProperty(i)) {
+				_options[i] = options[i];
+			}
+	}
+
+	function init(options) {
+		if (isInitialized) { return; }
+
+		isInitialized = true;
+
+		if(options) {
+			setOptions(options);
+		}
+
+		if (!_options.noUi) {
+			logEl = createPanel();
+			document.body.appendChild(logEl);
+		}
+
+		if (!_options.freeConsole) {
+			// Backup actual fns to keep it working together
+			_console.log = console.log;
+			_console.clear = console.clear;
+			_console.info = console.info;
+			_console.warn = console.warn;
+			_console.error = console.error;
+			console.log = originalFnCallDecorator(log, 'log');
+			console.clear = originalFnCallDecorator(clear, 'clear');
+			console.info = originalFnCallDecorator(info, 'info');
+			console.warn = originalFnCallDecorator(warn, 'warn');
+			console.error = originalFnCallDecorator(error, 'error');
+		}
+	}
+
+	function destroy() {
+		isInitialized = false;
+		console.log = _console.log;
+		console.clear = _console.clear;
+		console.info = _console.info;
+		console.warn = _console.warn;
+		console.error = _console.error;
+		logEl.remove();
+	}
+
+	/**
+	 * Checking if isInitialized is set
+	 */
+	function checkInitialized() {
+		if (!isInitialized) {
+			throw 'You need to call `screenLog.init()` first.';
+		}
+	}
+
+	/**
+	 * Decorator for checking if isInitialized is set
+	 * @param  {Function} fn Fn to decorate
+	 * @return {Function}      Decorated fn.
+	 */
+	function checkInitDecorator(fn) {
+		return function() {
+			checkInitialized();
+			return fn.apply(this, arguments);
+		};
+	}
+
+	/**
+	 * Decorator for calling the original console's fn at the end of
+	 * our overridden fn definitions.
+	 * @param  {Function} fn Fn to decorate
+	 * @param  {string} fn Name of original function
+	 * @return {Function}      Decorated fn.
+	 */
+	function originalFnCallDecorator(fn, fnName) {
+		return function() {
+			fn.apply(this, arguments);
+			if (typeof _console[fnName] === 'function') {
+				_console[fnName].apply(console, arguments);
+			}
+		};
+	}
+	window.addEventListener('error', function() {
+		genericLogger(_options.errorColor).call(null, arguments[0].error.stack);
+	});
+
+	// Public API
+	window.screenLog = {
+		init: init,
+		log: originalFnCallDecorator(checkInitDecorator(log), 'log'),
+		clear: originalFnCallDecorator(checkInitDecorator(clear), 'clear'),
+		info: originalFnCallDecorator(checkInitDecorator(clear), 'info'),
+		warn: originalFnCallDecorator(checkInitDecorator(warn), 'warn'),
+		error: originalFnCallDecorator(checkInitDecorator(error), 'error'),
+		destroy: checkInitDecorator(destroy)
+	};
+})();
+screenLog.init({
+	noUi: true,
+	proxyCallback: function () {
+		window.parent.onMessageFromConsole.apply(null, arguments);
+	}
+});
+window._wmEvaluate = function _wmEvaluate(expr) {
+	try {
+		var result = eval(expr);
+	} catch(e) {
+		window.parent.onMessageFromConsole.call(null, e);
+		return;
+	}
+	window.parent.onMessageFromConsole.call(null, result);
+}
\ No newline at end of file
diff --git a/src/script.js b/src/script.js
index 9a02383..1ebcf77 100644
--- a/src/script.js
+++ b/src/script.js
@@ -5,7 +5,7 @@ addLibraryModal, addLibraryModal, notificationsBtn, notificationsModal, notifica
 notificationsModal, notificationsBtn, codepenBtn, saveHtmlBtn, saveBtn, settingsBtn,
 onboardModal, settingsModal, notificationsBtn, onboardShowInTabOptionBtn, editorThemeLinkTag,
 onboardDontShowInTabOptionBtn, TextareaAutoComplete, savedItemCountEl, indentationSizeValueEl,
-runBtn, searchInput
+runBtn, searchInput, consoleEl, consoleLogEl, logCountEl
 */
 /* eslint-disable no-extra-semi */
 ;(function (alertsService) {
@@ -71,6 +71,7 @@ runBtn, searchInput
 		, codeInPreview = { html: null, css: null, js: null }
 		, isSavedItemsPaneOpen = false
 		, editorWithFocus
+		, logCount = 0
 
 		// DOM nodes
 		, frame = $('#demo-frame')
@@ -91,6 +92,7 @@ runBtn, searchInput
 		;
 
 	scope.cm = {};
+	scope.frame = frame;
 	scope.demoFrameDocument = frame.contentDocument || frame.contentWindow.document;
 
 	// Check all the code wrap if they are minimized or not
@@ -463,6 +465,8 @@ runBtn, searchInput
 		scope.cm.css.refresh();
 		scope.cm.js.refresh();
 
+		scope.clearConsole();
+
 		// To have the library count updated
 		updateExternalLibUi();
 
@@ -700,6 +704,7 @@ runBtn, searchInput
 
 	window.previewException = function (error) {
 		console.error('Possible infinite loop detected.', error.stack)
+		window.onMessageFromConsole('Possible infinite loop detected.', error.stack);
 	}
 	window.onunload = function () {
 		saveCode('code');
@@ -734,6 +739,9 @@ runBtn, searchInput
 			+ '<body>\n' + html + '\n'
 			+ externalJs + '\n';
 
+		contents += '<script src="'
+			+ chrome.extension.getURL('lib/screenlog.js') + '"></script>';
+
 		if (js) {
 			contents += '<script>\n' + js + '\n//# sourceURL=userscript.js';
 		} else {
@@ -969,8 +977,18 @@ runBtn, searchInput
 	});
 	Inlet(scope.cm.js);
 
+	// Initialize codemirror in console
+	scope.consoleCm = CodeMirror(consoleLogEl, {
+		mode: 'javascript',
+		lineWrapping: true,
+		theme: 'monokai',
+		foldGutter: true,
+		readOnly: true,
+		gutters: [ 'CodeMirror-foldgutter' ]
+	});
+
 	function openSettings() {
-		settingsModal.classList.toggle('is-modal-visible');
+		scope.toggleModal(settingsModal);
 
 		/* if (chrome.runtime.openOptionsPage) {
 			// New way to open options pages, if supported (Chrome 42+).
@@ -1232,6 +1250,7 @@ runBtn, searchInput
 		htmlCode.querySelector('.CodeMirror').style.fontSize = prefs.fontSize;
 		cssCode.querySelector('.CodeMirror').style.fontSize = prefs.fontSize;
 		jsCode.querySelector('.CodeMirror').style.fontSize = prefs.fontSize;
+		consoleEl.querySelector('.CodeMirror').style.fontSize = prefs.fontSize;
 
 		// Update indentation count when slider is updated
 		indentationSizeValueEl.textContent = $('[data-setting=indentSize]').value;
@@ -1252,6 +1271,7 @@ runBtn, searchInput
 			scope.cm[type].setOption('keyMap', $('[data-setting=keymap]:checked').value);
 			scope.cm[type].refresh();
 		});
+		scope.consoleCm.setOption('theme', $('[data-setting=editorTheme]').value);
 	};
 
 	scope.onNewBtnClick = function () {
@@ -1273,6 +1293,15 @@ runBtn, searchInput
 		trackEvent('ui', 'saveBtnClick', currentItem.id ? 'saved' : 'new');
 		saveItem();
 	};
+
+	/**
+	 * Toggles a modal and logs an event.
+	 * @param  {Node} modal     modal to be toggled
+	 */
+	scope.toggleModal = function (modal) {
+		modal.classList.toggle('is-modal-visible');
+		document.body.classList[modal.classList.contains('is-modal-visible') ? 'add' : 'remove']('overlay-visible');
+	};
 	scope.onSearchInputChange = function (e) {
 		const text = e.target.value;
 		let el;
@@ -1287,8 +1316,53 @@ runBtn, searchInput
 		trackEvent('ui', 'searchInputType');
 	};
 
-	function compileNodes() {
+	scope.toggleConsole = function () {
+		consoleEl.classList.toggle('is-minimized');
+		trackEvent('ui', 'consoleToggle');
+	};
+	scope.clearConsole = function () {
+		scope.consoleCm.setValue('');
+		logCount = 0;
+		logCountEl.textContent = logCount;
+	};
+	scope.onClearConsoleBtnClick = function () {
+		scope.clearConsole();
+		trackEvent('ui', 'consoleClearBtnClick');
+	};
+	scope.evalConsoleExpr = function (e) {
+		// Clear console on CTRL + L
+		if (((e.which === 76 || e.which === 12) && e.ctrlKey)) {
+			scope.clearConsole();
+			trackEvent('ui', 'consoleClearKeyboardShortcut');
+		} else if (e.which === 13) {
+			window.onMessageFromConsole('> ' + e.target.value);
 
+			/* eslint-disable no-underscore-dangle */
+			frame.contentWindow._wmEvaluate(e.target.value);
+
+			/* eslint-enable no-underscore-dangle */
+
+			e.target.value = '';
+			trackEvent('fn', 'evalConsoleExpr');
+		}
+	};
+	window.onMessageFromConsole = function() {
+
+		/* eslint-disable no-param-reassign */
+		[...arguments].forEach(function(arg) {
+			if (arg && arg.indexOf && arg.indexOf('filesystem:chrome-extension') !== -1) {
+				arg = arg.replace(/filesystem:chrome-extension.*\.js:(\d+):*(\d*)/g, 'script $1:$2');
+			}
+			scope.consoleCm.replaceRange(arg + ' ' + ((arg + '').match(/\[object \w+]/) ? JSON.stringify(arg) : '') + '\n', { line: Infinity });
+			scope.consoleCm.scrollTo(0, Infinity);
+			logCount++;
+		});
+		logCountEl.textContent = logCount;
+
+		/* eslint-enable no-param-reassign */
+	};
+
+	function compileNodes() {
 		function attachListenerForEvent(eventName) {
 			const nodes = $all(`[d-${eventName}]`);
 			nodes.forEach(function (el) {
@@ -1300,6 +1374,7 @@ runBtn, searchInput
 		attachListenerForEvent('click');
 		attachListenerForEvent('change');
 		attachListenerForEvent('input');
+		attachListenerForEvent('keyup');
 	}
 
 	function init () {
@@ -1321,19 +1396,17 @@ runBtn, searchInput
 		layoutBtn4.addEventListener('click', getToggleLayoutButtonListener(4));
 
 		utils.onButtonClick(helpBtn, function () {
-			helpModal.classList.toggle('is-modal-visible');
-			document.body.classList[helpModal.classList.contains('is-modal-visible') ? 'add' : 'remove']('overlay-visible');
+			scope.toggleModal(helpModal);
 			trackEvent('ui', 'helpButtonClick');
 		});
 		utils.onButtonClick(addLibraryBtn, function () {
-			addLibraryModal.classList.toggle('is-modal-visible');
-			document.body.classList[addLibraryModal.classList.contains('is-modal-visible') ? 'add' : 'remove']('overlay-visible');
+			scope.toggleModal(addLibraryModal);
 			trackEvent('ui', 'addLibraryButtonClick');
 		});
 
 		notificationsBtn.addEventListener('click', function () {
-			notificationsModal.classList.toggle('is-modal-visible');
-			document.body.classList[notificationsModal.classList.contains('is-modal-visible') ? 'add' : 'remove']('overlay-visible');
+			scope.toggleModal(notificationsModal);
+
 			if (notificationsModal.classList.contains('is-modal-visible') && !hasSeenNotifications) {
 				hasSeenNotifications = true;
 				notificationsBtn.classList.remove('has-new');
@@ -1440,6 +1513,7 @@ runBtn, searchInput
 			});
 		});
 
+		// Editor keyboard shortucuts
 		window.addEventListener('keydown', function (event) {
 			var selectedItemElement;
 			// Ctrl/⌘ + S
@@ -1505,6 +1579,10 @@ runBtn, searchInput
 		});
 		window.addEventListener('dblclick', function(e) {
 			var target = e.target;
+			if (target.classList.contains('js-console__header')) {
+				scope.toggleConsole();
+				trackEvent('ui', 'consoleToggleDblClick');
+			}
 			if (target.classList.contains('js-code-wrap__header')) {
 				var codeWrapParent = target.parentElement;
 				toggleCodeWrapCollapse(codeWrapParent);
@@ -1538,6 +1616,24 @@ runBtn, searchInput
 		new TextareaAutoComplete(externalJsTextarea, (obj) => obj.latest.match(/\.js$/));
 		new TextareaAutoComplete(externalCssTextarea, (obj) => obj.latest.match(/\.css$/));
 
+		// Console header drag resize logic
+		var consoleHeaderDragStartY;
+		var consoleInitialHeight;
+		function onConsoleHeaderDrag(e) {
+			consoleEl.style.height = (consoleInitialHeight + consoleHeaderDragStartY - e.pageY) + 'px';
+			utils.log(e.pageY, consoleHeaderDragStartY)
+		}
+		$('.js-console__header').addEventListener('mousedown', (e) => {
+			consoleHeaderDragStartY = e.pageY;
+			consoleInitialHeight = consoleEl.getBoundingClientRect().height;
+			$('#demo-frame').classList.add('pointer-none');
+			window.addEventListener('mousemove', onConsoleHeaderDrag);
+		});
+		$('.js-console__header').addEventListener('mouseup', () => {
+			window.removeEventListener('mousemove', onConsoleHeaderDrag);
+			$('#demo-frame').classList.add('pointer-none');
+		});
+
 		chrome.storage.local.get({
 			layoutMode: 1,
 			code: ''
@@ -1687,4 +1783,4 @@ runBtn, searchInput
 
 	init();
 
-})(window.alertsService);
+})(window.alertsService);
\ No newline at end of file
diff --git a/src/style.css b/src/style.css
index c13cf0c..f785454 100644
--- a/src/style.css
+++ b/src/style.css
@@ -107,6 +107,7 @@ select, input[type="text"], input[type="number"],  textarea {
 	top: 0; bottom: 0;
 	display: flex;
 	flex-direction: column;
+	overflow: hidden;
 	will-change: -webkit-filter;
 	transition: 0.10s ease 0.2s;
 }
@@ -119,6 +120,7 @@ select, input[type="text"], input[type="number"],  textarea {
 .demo-side {
 	flex-basis: inherit;
 	position: relative;
+	width: 50%;
 }
 .layout-3 .content-wrap {
 	flex-direction: row-reverse;
@@ -126,7 +128,6 @@ select, input[type="text"], input[type="number"],  textarea {
 .code-side {
 	display: flex;
 	flex-direction: column;
-	width: 50%;
 }
 .layout-2 .content-wrap {
 	flex-direction: column;
@@ -135,6 +136,9 @@ select, input[type="text"], input[type="number"],  textarea {
 	flex-direction: row;
 	width: auto;
 }
+.layout-2 .demo-side {
+	width: auto;
+}
 .layout-4 .code-side {
 	display: none;
 }
@@ -182,6 +186,7 @@ select, input[type="text"], input[type="number"],  textarea {
 	color: #888;
 	border-bottom: 1px solid rgba(0,0,0,0.3);
 	font-weight: bold;
+	user-select: none;
 }
 .code-wrap__header-label {
 	/*transform: translate(0px) scale(1.2);*/
@@ -190,7 +195,7 @@ select, input[type="text"], input[type="number"],  textarea {
 	opacity: 0.5;
 	/*transform-origin: left center;*/
 }
-.layout-2 .is-minimized .code-wrap__header {
+.layout-2 .code-side .is-minimized .code-wrap__header {
 	writing-mode: vertical-lr;
 	padding: 10px 5px;
 }
@@ -201,9 +206,14 @@ select, input[type="text"], input[type="number"],  textarea {
 	opacity: 0;
 }
 .code-wrap__header-btn {
+	display: inline-block;
+	vertical-align: top;
+	margin-left: 8px;
+}
+.code-wrap__header-btn,
+.code-wrap__header-btn > svg  {
 	width: 18px;
 	height: 18px;
-	display: inline-block;
 }
 .code-wrap__collapse-btn:before {
 	content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" style="width:18px;height:18px" viewBox="0 0 24 24"><path fill="rgba(255,255,255,0.2)" d="M19.5,3.09L15,7.59V4H13V11H20V9H16.41L20.91,4.5L19.5,3.09M4,13V15H7.59L3.09,19.5L4.5,20.91L9,16.41V20H11V13H4Z" /></svg>');
@@ -263,7 +273,7 @@ li.CodeMirror-hint-active {
 #demo-frame {
 	border: 0;
 	width: 100%;
-	height: 100%;
+	height: calc(100% - 29px); /*  minus minimized console height */
 	position: absolute;
 	z-index: 1;
 	background: white;
@@ -271,11 +281,14 @@ li.CodeMirror-hint-active {
 .main-header,
 .footer {
 	padding: 5px 10px;
-	background-color: rgba(0, 0, 0, 0.5);
+	background-color: rgb(18, 19, 27);
 	color: rgba(255, 255, 255, 0.45);
 	border-top: 1px solid rgba(255,255,255,0.14);
 	/*line-height: 20px;*/
 }
+.footer {
+	z-index: 1;
+}
 .main-header {
 	border: 0;
 	border-bottom: 1px solid rgba(255,255,255,0.14);
@@ -810,3 +823,33 @@ li.CodeMirror-hint-active {
 .wobble {
 	animation-name: wobble;
 }
+.console {
+	background: var(--color-bg);
+	z-index: 1; /* bring above iframe */
+	position: absolute;
+	bottom: 0;
+	min-height: 80px;
+	height: 35vh;
+	left: 0;
+	right: 0;
+	transform: translateY(0);
+	transition: transform 0.4s cubic-bezier(0.76, 0.01, 0.13, 0.9);
+}
+.console.is-minimized {
+	transform: translateY(calc(100% - 29px));
+}
+.console .Codemirror {
+	height: calc(100% - 55px);
+}
+.console-exec-input {
+	padding: 5px;
+	font-size: 1.3em;
+	flex: 1;
+	background: rgba(0,0,0,0.3);
+	color: white;
+	border: 0;
+	outline: 0;
+}
+.console:not(.is-minimized) .code-wrap__header {
+	cursor: ns-resize;
+}
\ No newline at end of file