UptimeRobot

<div class="ql-editor" style="font-size: 13px; font-family: Lato; color: rgb(0, 0, 0);"><p><strong class="ql-font-lato">Monitors your websites every 5 minutes and is totally free. Add up to 50 websites. Get alerts by e-mail, SMS or RSS (Twitter coming soon).</strong></p><p><br></p><h3><strong class="ql-font-lato">Website monitoring</strong></h3><p><span class="ql-font-lato">Be the first to know that your website is down! Reliable monitoring warns you before any significant trouble and saves you money.</span></p><p><br></p><h3><strong class="ql-font-lato">SSL monitoring</strong></h3><p><span class="ql-font-lato">Don't lose visitors because of an expired SSL certificate. Get notified 30, 14 and 7 days before expiration.</span></p><p><br></p><h3><strong class="ql-font-lato">Domain expiration monitoring</strong></h3><p><span class="ql-font-lato">Keep your online presence secure and avoid any potential damage by monitoring your domain's expiration date.</span></p><p><br></p><h3><strong class="ql-font-lato">Cron job monitoring</strong></h3><p><span class="ql-font-lato">Also known as heartbeat monitoring. Monitor recurring background jobs or intranet devices connected to the internet.</span></p></div>