“When the trial is on, don't call your product yearly — call it a free trial. You need to communicate enough with the user that this is free: just mentioning it once is not enough.”

When the trial toggle is on, label the plan "Try for free" — not "Yearly access"

One of the most common free-trial mistakes is saying 'Start for free' once in the button while labeling the selected plan 'Yearly access.' The plan label is what users read to understand what they are signing up for. Switching it to 'Try for free' when the trial toggle is active dramatically reinforces the zero-risk message at exactly the moment of decision.