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Moritz started Refiner in 2020. They detail the beginnings of their company in their Starter Story interview: 
Q: How did you get started on Refiner?
The initial idea for Refiner was born when I was still working on my last startup Docparser, a document processing software for SMEs.
This was in 2019. I had just sold Docparser and I was transitioning out of the company that I’ve built. I worked a couple of days per week only. Life was easy and relaxed.
As I love building stuff, I quickly felt the urge to tinker around with new ideas and building something new from scratch.
I was looking into a couple of different ideas, most of them related to what I know best: B2B SaaS.
I finally settled on an idea that would lead to what Refiner is today. A tool for SaaS companies to easily survey and profile their users.