Since covid-19 outbreak, governments and public administrations from several countries have been relying on open source tracing apps to help citizens while simultaneously advancing the technology ecosystem. Some of the examples include Immuni (Italy), SwissCovid (Switzeland), Open Trace (Singapore) or Corona-warn-app (Germany). One benefit that comes from the open source nature and transparency of these apps, is how quickly these solutions can scale up to stop disease outbreaks. To know more about the details, we need to take a deeper look at their software development activity. During this talk, we will share some insights from a previous analysis about open source contact tracing apps, in order to see how robust the software development activity is on the different solutions.