I had the idea in mind for a long time. I believe I even made a couple of prototypes before this date.
However, I started working more seriously on it since August 14th 2019.
At the moment I had contracted a 1 time full employee to help me with side projects regarding my other products (fullpage.js) and I took the chance to also iterate a bit on this idea.
The purpose was to create an internal tool for myself and not a product for others.
It was only later on when I saw the potential on it when I realised it might be useful for others too.