[commoner]

Previous versions of the FCC Speed Test app are free and open source (GPLv2):

2017 iOS version: https://github.com/SamKnows/skios-fcc

2014 Android version: https://github.com/SamKnows/skandroid-fcc

2013 Android version: https://github.com/FCC/mobile-mba-androidapp

Methodology: https://www.fcc.gov/general/measuring-broadband-america-open...

Judging from the media coverage, it looks like the app was recently updated. The source code for the current version has not yet been released, but I hope that it will be soon.

[Zhenya]

There is no guarantee that the app is built only from the open source bits.

[commoner]

That is always the case unless reproducible builds are available.