Exporting responses
CSV for everything, PDF for one.
CSV
Exports every response with a column per question, using the question labels rather than internal references.
Values that could be interpreted as a formula by a spreadsheet are escaped, so opening the file can't execute anything.
Exports a single response laid out the way it appears on screen, including multiple-choice questions showing every option with the chosen one marked. Free plans include a CrispForms footer; Pro removes it.
Partial responses
Someone who answered six of ten questions and left has still told you six things. Those are captured on every plan. Viewing and exporting them is a Pro feature.