Before revision:  Using model parameters tailored to describe SARS-CoV-2 diffusion, we show thateven when the probability for a contact to be traced is the same, manual contact tracing robustly performs better than the digital protocol in increasing the epidemic threshold, limiting the height of the epidemic peaks and reducing the number of isolated individuals.
After revision:  We show that, even for equal probability of tracing a contact, manual tracing robustly performs better than the digital protocol in increasing the epidemic threshold, limiting the height of the epidemic peaks and reducing the number of isolated individuals.