Do I have to buy each product separately?
No. Products are surfaces onto one workspace, not separate installations. A crawl you run once feeds the audit, the link tools, the content briefs and the reports, which is why the findings in each of them agree with one another.
Which product should I start with?
Start with Site Audit on one real project. It captures the crawl every other product reads, so it turns the rest of the system on. Choosing by outcome rather than by feature name is what the categories above are for.
What data do I need to connect before anything works?
A verified domain is enough to crawl. Search Console is what adds Google's own view of impressions, positions and indexing - without it the product tells you what is on your pages, and says plainly that it cannot speak for what Google did.
Can I use this without connecting Search Console?
Yes, and the difference is stated rather than hidden. Crawl-based findings work fully; anything that would need Google's own evidence is marked as not measured instead of estimated, because a guess about a third party is worse than an honest gap.
How is this different from a one-off SEO audit?
An audit is a snapshot; this is a loop. A finding is re-tested against your own evidence on the next crawl and retired when the page proves it fixed, so the list you work from is what is still true today rather than what was true the day it was generated.
Do the products work for a site in a language other than English?
Yes. The crawl and the technical checks are language-independent, and keyword and ranking data are requested for the market and script you select rather than defaulting to one country.
What happens to my data if I stop using Novaverb?
Your project data belongs to you and can be exported while the workspace is active. Deleting a project removes it from every product that reads it, so nothing keeps reporting on a site you have withdrawn.