METHOD
How WhichMailer compares platforms
One registry feeds every page: prices and limits are copied from official pricing pages, dated internally, and rendered through the same rules everywhere. Comparisons build the same scenario on both platforms. A test is only presented as a result when it was actually executed.
The registry
Every price, plan name, tier and sending limit lives in a single data registry. Each entry records its source URL and the date we last checked it. Pages cannot contain a hand-typed price: they reference the registry, so an update propagates everywhere at once. When a provider does not publish a number, the site says "not published" rather than estimating it.
How comparisons are built
A comparison defines one scenario (the same newsletter, the same automation, the same list size) and holds both platforms to it. Verdicts name the reader they apply to: "our pick for most readers" plus "pick it if", never a single absolute winner. Prices in comparisons come from the same registry as everywhere else.
When we claim a test
Pages under Tests are either executed tests, with steps and evidence, or protocols that have not run yet, labelled as protocols. We do not publish results we did not observe, and we do not present documentation reading as testing.
How we would measure inbox placement
Inbox placement claims ("platform X has better deliverability") are mostly unverifiable marketing. Our protocol, when we run it, is: same domain authentication (SPF, DKIM, DMARC) on both platforms, same content, same warmed sending domain age, seed inboxes across the major providers, multiple sends spread over days, and results reported per provider with the sample size. Until a page shows that data, WhichMailer makes no inbox placement claims. Diagnosing warmup for your own domain is a different job, outside this site's scope.
The long version, including what the mailbox providers themselves publish and what you can check on your own domain, is on why we publish no inbox placement ranking.
What affiliation changes
Nothing in the numbers. Some outbound buttons use affiliate links (marked sponsored); most currently point to the official sites because no partnership is active. Rankings, verdicts and registry amounts are set before any link is chosen. Details: affiliate disclosure.
The place of AI
Logos and product interfaces on this site are always the vendors' own published files: we never generate a screenshot, a dashboard, an email template or a brand mark. The illustrations of the guides, the section covers and the page headers are generated by AI and redrawn to one style, as a visual aid only; guide illustrations say so in their caption. They never show a real product, a real price, a real inbox or a test result.