“Unsweetened” is a subclass of “no sugar added” though, and so if you’re really looking for “unsweetened”, you still have to read the labels of all of the “no sugar added” products that chose that (more generic) label over the (more specific) “unsweetened” label.
“Unsweetened” means no sweeteners added. “No sugar added” means no sugars, but maybe other sweeteners.
“Unsweetened” is a subclass of “no sugar added” though, and so if you’re really looking for “unsweetened”, you still have to read the labels of all of the “no sugar added” products that chose that (more generic) label over the (more specific) “unsweetened” label.