Ah, the great mystery of Sour 3. Truth is that building applications is a learning process, and Sour 1 and 2 simply never saw a public release.
In 2013 Sour 1 was built as an internal tool for Superpencil to manage agency clients. It was built with Ruby on Rails, and while it ran well and was enjoyed by our clients, but was never publically released as the the codebase grew too large before taking into consideration what would be needed to make it a publicly available tool.
In 2017 Sour 2 was created but the nerdy combination of technologies used (Firebase, HyperScript, and Coffeescript 2) got in the way of actually getting work done. To this day Superpencil uses this codebase to show engineers who like to use "some new technology" why you should stick to what you know. 😜
Thus, Sour 3 is the first public version of Sour.
The 3D models used for the "logo" were created by YouniqueĪdeaStudio1 and Yu2 and are available on SketchFab.