Surfer and RankBull both talk about AI search. They start from different documents.
Surfer starts from the URL you are writing. Content Score, SERP terms, Surfy the writing assistant, audits, internal links. Higher plans add AI prompt tracking (Standard lists 25 prompts across ChatGPT; Pro and Peace of Mind refresh daily). Pricing as of September 2026: Discovery $49/mo, Standard $99/mo, Pro $182/mo, Peace of Mind $299/mo.
RankBull starts from the answer an assistant already gave a shopper. You see the transcript, the competitor names, then RankBull drafts and publishes a page aimed at that question - WordPress, Shopify, Webflow, or webhook - and scans again.
Keep Surfer if your bottleneck is 'this draft does not match the SERP yet.' Use RankBull if the bottleneck is 'ChatGPT recommended someone else, and I need a page live this week.'