What's the difference between NPS and customer review services such as TrustPilot?
Customer review sites are incredibly powerful buying aids to help potential customers get what's called 'social proof' about a product from other customers. They work on the same principal as you trusting what your friend says about a new restaurant rather than the restaurant's own website. TrustPilot is a fantastic resource for consumers to help them make informed buying choices.
NPS, in comparison, is used to help your business understand the customer's experience of using your business and products. You can then use NPS data to improve the service you offer your customers and ensure that they're happy customers who act as your ambassadors and spread the word about how great it is to deal with you and your products.