Campaign Monitor
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Campaign Monitor's editor is built around precise, tested rendering, historically its calling card among agencies tired of emails breaking in Outlook. Agency-focused features carry over from that history: client accounts can be managed and billed separately under one login, and templates can be locked down so a client edits content without breaking the layout. Automation covers standard triggers (welcome, abandoned cart, date-based) through a visual journey builder.
Pricing is by contact count and there's no permanent free plan, only a limited sandbox capped at 5 test subscribers. The Lite plan starts around $13 a month for 500 contacts but caps how many emails you can send; Essentials starts near $31 and Premier near $171 at that same contact count, both with unlimited sends and progressively more automation and reporting. Rates climb steeply at larger list sizes, so this is best suited to an agency or brand that values the rendering quality and client-management tools enough to pay a premium over younger competitors.