Answer 4 questions. Get the one platform that fits your business — and its true cost at your list size and send frequency.
The single biggest hidden cost is billing model: per-contact tools charge for every stored subscriber whether you email them or not; per-send tools charge only for what you send. At a large, lightly-emailed list that difference can be 4×.
Disclosure: This tool is free. If you sign up through a link on this page, I may earn a recurring commission from the platform you choose. That commission never changes which platform is recommended — the verdict is computed from your inputs, not from who pays more. Pricing shown is list-price, monthly, in USD, verified against vendor pricing pages and subject to change; the vendor's page is authoritative.