It allows to capture names and emails of your site visitors Wwth customizable opt-in forms: MailMunch
Web app helps you design and build pop-up and other types of opt-in forms that you can use on your website or blog to capture names and emails of customers who are interested in remaining in contact with you.
3. Top bar
4. Side box
It integrates and connects to Mailchimp, Aweber, GetResponse, and many others.
Free version available. Good for unlimted forms on one site.
Pricing info: https://www.mailmunch.co/pricing/