Free: the model runs on this machine (Ollama), so there is no API bill and no key in the browser. The first reply after a restart can take about a minute while the model loads.
Upload a CSV (or a pipe-delimited .txt, up to 5 MB). Pick a task. Nothing is stored; the file is analysed in memory and discarded.
Regression and forecast need a numeric target column. Regression is fit on all rows (no hold-out), so R² shows fit, not predictive accuracy.