How do Mailchimp and Offset compare in monthly traffic?

Mailchimp has 10,071,636 monthly visits, while Offset has 57. Traffic estimates describe audience size, not product quality.

How do their growth rates compare?

Mailchimp has a month-over-month growth rate of +1.1%; Offset has -89.5%.

How does pricing compare?

Mailchimp: Freemium. Freemium with a free tier for smaller lists, plus paid Essentials, Standard, and Premium plans billed by contact count. A free trial of paid plans is offered, with annual billing discounts. Offset: Contact for Pricing. No public price list. The site offers no self-serve pricing page, so commercial terms are arranged directly with the vendor; legacy placement was Free Trial / Paid / Contact for Pricing. Expect seat- or enterprise-based contracts, especially for on-premise or audit-heavy deployments.