I'm Andrew, QuantFit's maker and a macroeconomist. The part I want to show is the workflow: pull World Bank data into the app, explore it with charts, correlations and scatterplots, then estimate a model and inspect diagnostics without moving the dataset between tools.
A practical starting point: choose the countries, indicators and time range for your question; check the series and missing observations; compare relationships visually; then choose an estimator and examine the relevant pre- and post-estimation tests. The method still needs to fit the data and research question.
QuantFit is live for iPhone: https://quantfit.app
For researchers: which step would you most want to see in a worked example data import, exploration, model setup or diagnostics?