When does a significant p-value indicate a true effect?

Understanding the Positive Predictive Value (PPV) of a p-value

Across all investigated hypotheses: What % of them is actually true?

What is your Type I error (α; typically 5%)?

On what power level are the studies conducted?

% of studies that report a significant result, although it's not

This blog post gives an introduction to the app.
This app is based on Ioannidis, J. P. A. (2005). Why most published research findings are false. PLoS Medicine, 2(8), e124. http://doi.org/10.1371/journal.pmed.0020124