Blue is the primary color of the Mimesia brand. Not just any blue, but a specific shade, that has changed over time.
Much like the identity of a person, the (corporate) identity of Mimesia is not static. As times change, so do aspects of the Mimesia brand. This has caused Mimesia Blue to go through several iterations, and these will probably not be the last.
If you want to use the Mimesia brand colors in your project, you can get the variables in Sass or less format.