Carrd can be used to create websites for a wide variety of areas. The special feature here is its simplicity. You can create visually appealing websites quickly and inexpensively. Through integrations, for example, currently used newsletter providers can be used for opt-ins. Carrd offers various integration options, including Mailchimp, Convertkit, Stripe, PayPal, Typeform and many more.
The company Carrd Inc. is based in Franklin, USA. You can find out more about data protection in Carrd's data protection declaration:
https://carrd.co/docs/general/privacy