Brevo
Brevo (formerly Sendinblue) bundles email campaigns, marketing automation, transactional email, SMS and a light CRM. Plans are priced by monthly email volume rather than contact count, so large lists stay affordable… Read the full Brevo review

Email Marketing products that compete with Klaviyo, ranked by BSR score. If "paid pricing scales with contact count and channel usage, so total cost depends on list size and send volume." is why you're looking, filter by the feature you're missing.
Brevo (formerly Sendinblue) bundles email campaigns, marketing automation, transactional email, SMS and a light CRM. Plans are priced by monthly email volume rather than contact count, so large lists stay affordable… Read the full Brevo review
Mailchimp is an email marketing platform with a drag-and-drop editor, hundreds of templates, audience segmentation and automated journeys. Landing pages, signup forms and basic SMS are included, and it connects to most e-commerce and CRM tools… Read the full Mailchimp review