Mailchimp is the default first email marketing platform for many US businesses. The interface is familiar, the template library is one of the largest in the category, and the free plan lets small senders trial the product on up to 500 contacts and 1,000 monthly sends.
The trade-off is cost as the list grows. Mailchimp bills for all contacts including unsubscribed ones, raised prices repeatedly since 2022, and cut the free plan from 2,000 to 500 contacts. SMS is a paid add-on on Essentials and above, sent to US mobiles natively. Many growing businesses comparison-shop alternatives once they pass a few thousand contacts.
Mailchimp was founded in 2001 and is headquartered in Atlanta, USA.