Which products/market segments are like Intercom of 2014 -> 2017 🚀

I'm casting a wide net trying to discover markets and products that I currently do not know of.

The best description I've managed to come up with is the title of this post.

Which products or market segments are in the stage that Intercom underwent between 2014-2017?

https://blog.salesflare.com/how-intercom-became-a-unicorn-product-b952bb8575c5

Another example would be Teachable between 2015-2018.

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I'm using the growth rate of such products to be a proxy for

• how quickly demand is rising in said markets
• how big said markets are

I'm wondering what other IHers think. Or have you thought along similar lines. And if you did, what comes to mind?

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I have one to share. I think Kapwing is a rocketship and it's still early days. 2015-2016 in Intercom timeline me thinks.