diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..75d1064
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/vendor/
+/composer.lock
+/output/
diff --git a/comparison b/comparison
new file mode 100755
index 0000000..9385d64
--- /dev/null
+++ b/comparison
@@ -0,0 +1,11 @@
+#!/usr/bin/env php
+<?php
+
+require __DIR__ . '/vendor/autoload.php';
+
+use Codappix\WebsiteComparison\Command\CreateBaseCommand;
+use Symfony\Component\Console\Application;
+
+$application = new Application();
+$application->add(new CreateBaseCommand());
+$application->run();
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..c8bc4bb
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,23 @@
+{
+    "name": "codappix/website-comparison",
+    "description": "Compares a Website visually by comparing Screenshots.",
+    "type": "project",
+    "license": "GPL-2.0-or-later",
+    "authors": [
+        {
+            "name": "Daniel Siepmann",
+            "email": "coding@daniel-siepmann.de"
+        }
+    ],
+    "autoload": {
+        "psr-4": {
+            "Codappix\\WebsiteComparison\\": "src/"
+        }
+    },
+    "require": {
+        "facebook/webdriver": "^1.6",
+        "symfony/console": "^4.1",
+        "symfony/process": "^4.1",
+        "guzzlehttp/psr7": "^1.4"
+    }
+}
diff --git a/src/Command/CreateBaseCommand.php b/src/Command/CreateBaseCommand.php
new file mode 100644
index 0000000..b56da72
--- /dev/null
+++ b/src/Command/CreateBaseCommand.php
@@ -0,0 +1,101 @@
+<?php
+
+namespace Codappix\WebsiteComparison\Command;
+
+/*
+ * Copyright (C) 2018 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use Codappix\WebsiteComparison\Service\ScreenshotCrawlerService;
+use Facebook\WebDriver\Chrome\ChromeDriver;
+use Facebook\WebDriver\Chrome\ChromeDriverService;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Process\Exception\ProcessFailedException;
+use Symfony\Component\Process\Process;
+
+/**
+ *
+ */
+class CreateBaseCommand extends Command
+{
+    /**
+     * @var Process
+     */
+    protected $chromeProcess;
+
+    protected function configure()
+    {
+        $this
+            ->setName('comparison:createbase')
+            ->setDescription('Creates the base for comparison.')
+            ->setHelp('Crawls and screenshots the original website, as a base for future comparison.')
+
+            ->addOption(
+                'screenshotDir',
+                null,
+                InputOption::VALUE_OPTIONAL,
+                'Define the sub directory to use for storing created Screenshots.',
+                'output'
+            )
+            ->addOption(
+                'screenshotWidth',
+                null,
+                InputOption::VALUE_OPTIONAL,
+                'The width for screen resolution and screenshots.',
+                3840
+            )
+
+            ->addArgument(
+                'baseUrl',
+                InputArgument::REQUIRED,
+                'E.g. https://typo3.org/ the base url of the website to crawl.'
+            )
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $screenshotCrawler = new ScreenshotCrawlerService(
+            $output,
+            $this->getDriver(),
+            $input->getArgument('baseUrl'),
+            $input->getOption('screenshotDir'),
+            $input->getOption('screenshotWidth')
+        );
+        $screenshotCrawler->crawl();
+    }
+
+    protected function getDriver(): ChromeDriver
+    {
+        $chromeDriverService = new ChromeDriverService(
+            '/usr/lib/chromium-browser/chromedriver',
+            9515,
+            [
+                '--port=9515',
+                '--headless',
+            ]
+        );
+        $driver = ChromeDriver::start(null, $chromeDriverService);
+
+        return $driver;
+    }
+}
diff --git a/src/Model/UrlListDto.php b/src/Model/UrlListDto.php
new file mode 100644
index 0000000..0573968
--- /dev/null
+++ b/src/Model/UrlListDto.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Codappix\WebsiteComparison\Model;
+
+/*
+ * Copyright (C) 2018 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ *
+ */
+class UrlListDto
+{
+    protected $finishedUrls = [];
+
+    protected $upcomingUrls = [];
+
+    public function addUrl(string $link)
+    {
+        if ($this->isUrlKnown($link)) {
+            return;
+        }
+
+        $this->upcomingUrls[] = $link;
+    }
+
+    public function getNextUrl(): string
+    {
+        return reset($this->upcomingUrls) ?? '';
+    }
+
+    public function markUrlAsFinished(string $link)
+    {
+        $upcomingEntry = array_search($link, $this->upcomingUrls);
+
+        unset($this->upcomingUrls[$upcomingEntry]);
+
+        $this->finishedUrls[] = $link;
+    }
+
+    public function isUrlKnown(string $link): bool
+    {
+        return in_array($link, $this->finishedUrls) || in_array($link, $this->upcomingUrls);
+    }
+}
diff --git a/src/Service/ScreenshotCrawlerService.php b/src/Service/ScreenshotCrawlerService.php
new file mode 100644
index 0000000..c72b931
--- /dev/null
+++ b/src/Service/ScreenshotCrawlerService.php
@@ -0,0 +1,207 @@
+<?php
+
+namespace Codappix\WebsiteComparison\Service;
+
+/*
+ * Copyright (C) 2018 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use Codappix\WebsiteComparison\Model\UrlListDto;
+use Facebook\WebDriver\Remote\RemoteWebDriver;
+use Facebook\WebDriver\Remote\RemoteWebElement;
+use Facebook\WebDriver\WebDriverBy;
+use GuzzleHttp\Psr7\Uri;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Process\Process;
+
+/**
+ *
+ */
+class ScreenshotCrawlerService
+{
+    /**
+     * @var OutputInterface
+     */
+    protected $output;
+
+    /**
+     * @var RemoteWebDriver
+     */
+    protected $driver;
+
+    /**
+     * @var string
+     */
+    protected $baseUrl = '';
+
+    /**
+     * @var string
+     */
+    protected $screenshotDir = '';
+
+    /**
+     * @var int
+     */
+    protected $screenshotWidth = 3840;
+
+    public function __construct(
+        OutputInterface $output,
+        RemoteWebDriver $driver,
+        string $baseUrl,
+        string $screenshotDir = 'output/',
+        int $screenshotWidth = 3840
+    ) {
+        $this->output = $output;
+        $this->driver = $driver;
+        $this->baseUrl = rtrim($baseUrl, '/') . '/';
+        $this->screenshotDir = implode(DIRECTORY_SEPARATOR, [
+            dirname(dirname(dirname(__FILE__))),
+            rtrim($screenshotDir, '/')
+        ]) . DIRECTORY_SEPARATOR;
+        $this->screenshotWidth = $screenshotWidth;
+    }
+
+    public function crawl()
+    {
+        $this->createScreenshotDirIfNecessary();
+
+        $linkList = new UrlListDto();
+        $linkList->addUrl($this->baseUrl);
+
+        while ($url = $linkList->getNextUrl()) {
+            $this->driver->get($url);
+            $screenshotHeight = $this->driver->findElement(WebDriverBy::cssSelector('body'))
+                ->getSize()
+                ->getHeight();
+            $this->createScreenshot($this->driver->getCurrentURL(), $screenshotHeight);
+
+            $linkList->markUrlAsFinished($url);
+            array_map([$linkList, 'addUrl'], $this->fetchFurtherLinks(
+                $this->driver->findElements(WebDriverBy::cssSelector('a'))
+            ));
+        }
+    }
+
+    /**
+     * @throws \Exception If folder could not be created.
+     */
+    protected function createScreenshotDirIfNecessary(string $subPath = '')
+    {
+        $dir = $this->screenshotDir;
+        if ($subPath !== '') {
+            $dir = $dir . DIRECTORY_SEPARATOR . trim($subPath, DIRECTORY_SEPARATOR);
+        }
+        if (!is_dir($dir)) {
+            mkdir($dir, 0777, true);
+        }
+
+        if (!is_dir($this->screenshotDir)) {
+            throw new \Exception('Could not create screenshot dir: "' . $dir . '".', 1535528875);
+        }
+    }
+
+    protected function createScreenshot(string $url, int $height)
+    {
+        $screenshotTarget = $this->getScreenshotTarget($url);
+        $this->createScreenshotDirIfNecessary(dirname($screenshotTarget));
+
+        $screenshotProcess = new Process([
+            'chromium-browser',
+            '--headless',
+            '--disable-gpu',
+            '--window-size=' . $this->screenshotWidth . ',' . $height,
+            '--screenshot=' . $this->screenshotDir . $screenshotTarget,
+            $url
+        ]);
+        // TODO: Check for success
+        $screenshotProcess->run();
+
+        if ($this->output->isVerbose()) {
+            $this->output->writeln(sprintf(
+                '<info>Created screenshot "%s" for url "%s".</info>',
+                $this->screenshotDir . $screenshotTarget,
+                $url
+            ));
+        }
+    }
+
+    protected function getScreenshotTarget(string $url)
+    {
+        $uri = new Uri($url);
+
+        return implode(
+            DIRECTORY_SEPARATOR,
+            array_filter(
+                [
+                    $uri->getScheme(),
+                    $uri->getHost(),
+                    trim($uri->getPath(), '/'),
+                    $uri->getQuery(),
+                ],
+                function (string $string) {
+                    return trim($string, ' /') !== '';
+                }
+            )
+        ) . '.png';
+    }
+
+    protected function fetchFurtherLinks(array $webElements): array
+    {
+        $links = [];
+        foreach ($webElements as $webElement) {
+            try {
+                $link = $this->fetchLinkFromElement($webElement);
+            } catch (\Exception $e) {
+                continue;
+            }
+
+            $links[] = $link;
+        }
+
+        return $links;
+    }
+
+    protected function fetchLinkFromElement(RemoteWebElement $element): string
+    {
+        $uri = null;
+        $href = $element->getAttribute('href');
+        if (is_string($href)) {
+            $uri = new Uri($href);
+        }
+
+        if ($uri === null) {
+            throw new \Exception('Did not get a Uri for element.', 1535530859);
+        }
+
+        if ($this->isInternalLink($uri)) {
+            return (string) $uri;
+        }
+
+        throw new \Exception('Was external link.', 1535639056);
+    }
+
+    protected function isInternalLink(Uri $uri): bool
+    {
+        $validHosts = [
+            '',
+            (new Uri($this->baseUrl))->getHost(),
+        ];
+
+        return in_array($uri->getHost(), $validHosts);
+    }
+}