Add HotJar as a tool

README.md

@@ -116,6 +116,7 @@ You will find here a collection of free marketing channels for getting the first
 * [Referral Marketing](https://www.referralsaasquatch.com/comprehensive-referral-marketing-guide/) and [Mobile Referral Marketing](https://www.referralsaasquatch.com/ultimate-guide-to-mobile-referral-marketing/) can give you the word-of-mouth growth. For inspiration check [51 Best Referral Program Examples of 2016](https://www.referralsaasquatch.com/ultimate-guide-to-mobile-referral-marketing/). These useful guides were prepared by Brandon Gains from  Referral Saasquatch.
 * [5 Low-Cost Guerrilla Marketing Tactics](https://www.shopify.com/blog/116564869-5-low-cost-guerrilla-marketing-tactics-to-grow-your-business-offline) via Braveen Kumar. :monkey: Direct offline exposure via foot traffic would suit physical products and brave founders.
 * [Use free tools for lead generation](https://blog.clearbit.com/how-were-using-free-tools-to-engage-developers/) when you have a difficult software product with many use cases. It's a great way to show benefits of your main offering and increase brand awareness. This post shows how to sell Clearbit API-solution via free easy-to-use tools. You can invest your time and make some free stuff as well — UI kits, browser extensions, funny games or open source tools.
+* [HotJar](https://www.hotjar.com/) is a good tool to start optimizing your website. Find where people go and how they interact with your web pages to create the best converting pages possible!
 
 :bowtie: We used many free marketing channels. To be honest, when we started [Flawless App](https://flawlessapp.io/?utm_source=Github&utm_campaign=Collection-Marketing-For-Engineers&utm_medium=Free-Collection) we didn't have other ways. We wrote cold emails, talked to influencers, manually recruited users at events, posted at Facebook groups, worked with developers & designers via Twitter and did many other stuff. These gave us our first 1000 beta users. So it worth trying out!