Email service provider pricing is unusual. It scales by contacts and monthly sends, not seats, which means buyers compare against their own list size — what does this cost at one thousand subscribers, what does it cost at fifty thousand. They also compare automation depth, deliverability posture, and template freedom. ESP comparison pages benefit from price tables at common list sizes, which is brutal to maintain by hand because every ESP rebundles tiers each year.

SleekRank reads one matrix with slug, ESP name, free-tier limits, price at one thousand, price at ten thousand, price at fifty thousand, automation depth tag, and verdict. Per-ESP and ESP-vs-ESP pages share that source. Tag mappings push the list-size price points into table cells, list mappings render automation features into a repeated block, and the verdict flows into the page summary.

When Mailchimp restructures the contact bands or Klaviyo changes the ecommerce-tier price, you edit the row and flush the cache. The corpus catches up. The base page stays in your builder, with whatever affiliate disclosures, schema, and CTA structure you have already designed. Editorial work concentrates on the verdict and the data; layout work concentrates on the template; SleekRank handles propagation between them.

ESPs price by list-size band, and the bands move. Mailchimp restructured contact tiers more than once in recent years, ActiveCampaign added new tier names, Klaviyo widened the ecommerce-focused offer. The buyer who arrives at an ESP comparison page is usually thinking about a specific list size — five thousand, ten thousand, fifty thousand — and the answer they need is what it costs at that band, not what the entry-level tier is.

A page that shows an old price at ten thousand contacts is worse than no page at all, because the buyer clicks through to the vendor and discovers the discrepancy. ESP affiliate revenue depends on that click converting at the vendor, so trust on the page is paid trust. The freshness problem also affects free-tier accuracy.

Free tiers move more than paid tiers — Mailchimp changed its free contact limit, beehiiv expanded then trimmed, ConvertKit/Kit rebranded and adjusted. SleekRank does not solve research; it solves making sure the cell you edit on Tuesday is reflected on every page by Wednesday's cache cycle, including the pair pages where two ESPs are compared at the same list-size band.