The most popular email marketing solution on the market, quite expensive if you have a lot of contacts in your lists but don’t message them very often.
Cheapest premium plan: $9.99 per month
For 500 contacts in your lists. Mailchimp can become very quickly quite expensive if you have a lot of contacts but no reason to message them frequently. Same kind of pricing issue as for Chatfuel in the chatbot vertical.
Mailchimp Free plan available: YES
Mailchimp is best for
I still have an active free Mailchimp account for one use case: a newsletter populated by the RSS feed of my blog. Other than that, I would recommend to use a cheaper alternative like SendInBlue which offers a more reasonable pricing model, not based on contacts but on the amount of emails sent on a monthly basis.