Earlier quoted context omitted.
It's right there in the first paragraph: > With Sonar, engineers have a highly flexible, intuitive way to inspect and understand the structure and behavior of their iOS and Android application ...and the top of the post is tagged as "Mobile", "iOS", and "Android".
I think he meant appending "for mobile apps" in the title instead of burying key constraint in midst of wordy paragraphs. There is quite a distance between clarity and fine prints.
> I had to wait for the third section, not very helpfully titled "An open source architecture", to find any clues.