Yes, on the Free plan, you cannot access public app URLs. Public apps are only available on the Business and Enterprise plans. Therefore, any public links you had while on the Business plan will require authentication once you switch to the Free plan. If you need public access, you'll need to upgrade your plan again.
Hey @abdul - thanks for reaching out and flagging this. We rolled back the breaking change, meaning your public link should be accessible once again. You can read more context about what happened over here. Don't hesitate to follow up if you have any clarifying questions!