Ahrefs and RankBull overlap on one question - do AI assistants mention you? - and then they go in opposite directions.
Ahrefs is a full SEO platform. Brand Radar (as of September 2026) tracks brand mentions across Google AI Overviews, AI Mode, ChatGPT, Perplexity, Gemini, and Copilot, with a public-scale AI Visibility Index Ahrefs prices from $199/month. Custom prompts to track questions nobody searches your brand for yet are included on paid Ahrefs plans from Lite up (5 / 10 / 20 daily prompts on Lite / Standard / Advanced), with extra check packs from $50/month. The rest of Ahrefs - backlinks, keywords, site audit - is still the reason most teams pay.
RankBull is not a backlink database. The scan asks ChatGPT and Gemini real buyer questions, shows the verbatim answers with every competitor named, writes articles that answer those exact questions, publishes them to WordPress, Shopify, Webflow, or webhooks, and re-scans. Hosted plans start at $29/month with RankBull paying every provider bill. Or $499 once, self-hosted on keys you own.
If you already live in Ahrefs and need the industry-standard link graph, keep it - Brand Radar is an add-on to a suite you may already buy. If the job is 'see the answer, then publish the page that changes it,' RankBull is the cheaper closed loop.