What is the best SEO tools?

I'd love to hear from someone who uses OTTO by Search Atlas. Or any others like it? Currently, I license the tools below, so I'd have to sacrifice one to cover the cost of OTTO. So, if you use OTTO, I'd love to know whether it replaces some/all of these tools....? At $99USD/month for 5 sites it's expensive when I only need one site for our startup. A shame they don't have a freemium model to start. The costs add up! Frase.io - I use the brief template feature, the content outlines (together with Claude) for briefs & my writers optimise blogs in Frase Ahrefs - I use for k/w research, search intent, rank tracking, competitor research, tech site health etc Claude.ai - I use for content outlines, reworking copy, meta data copywriting, video scripts, marketing copy, idea creation Hemmingway - to keep copy at an accessible reading level (& of course Google Serch Console/Trends etc) I'd love to know what stack others use, particularly for auditing for topical authority around target primary keywords