Prevalence calculator (known sensitivity and specificity)

This interactive calculator accompanies the manuscript "Estimating SARS-CoV-2 seroprevalence and epidemiological parameters with uncertainty from serological surveys", which is available as a preprint. This work is not yet peer reviewed.
Given test results in a population sample, using a test with known sensitivity and specificity, what is the posterior distribution of prevalence in the population?
# positive tests
# negative tests
This is in beta. Please report bugs with screenshots to The source code for this visualization is on Github.