What I deliberately left off
Anything with no published pricing gets flagged rather than recommended. BrandLight is on this page because it is a serious enterprise product, but its pricing page returns a 404 and its engine coverage is only visible in dashboard screenshots. That is not enough to recommend it to anyone spending their own money.
I have also left off the long tail of tools that wrap a single API call in a dashboard and charge monthly for it. If a product cannot tell you how many responses it runs per prompt, it is guessing, and so are you.
How to choose without wasting budget
Write the prompt list first. Not keywords, prompts: the questions a buyer types before they know your name. Most businesses land between 20 and 40. That number sets your tier more than any feature table.
Then pick engines from where your buyers are. UK B2B is mostly Google AI Overviews and ChatGPT. Paying an add-on for Meta AI coverage is a rounding error. Developers skew to Claude, which is the most commonly gated engine across the whole category.
Last, check refresh frequency before you check engine count. Six engines sampled weekly tells you less than three sampled daily, because AI answers vary run to run. A tool that samples once a week is reporting noise.