I am still testing this app.
My approach to keyword research is a bit different from the conventional methods.
It starts with brainstorming and mind mapping, rolling my own hand drawn entity graph.
With this in mind I need tools that can give me co-occurrence, semantically related terms and entities, as input to my process. I predominantly use frase, inlinks, writerzen, and deep-talk to surface these during research.

The keyword research is decent and generous, each research accepts up to 50 words and only consumes 1 credit.

The semantic analysis is interesting and while I am not blown away with the results as compared to other tools it does help prioritize these terms.

The on-page analysis is also very nice, clean and easily readable. The information is presented in a very pleasing way and a flow that makes sense. Here are some of the things i like:
-Page title hierarchy
-Main optimized lexical fields of the page
-Relevant main keywords and presence in the tags
-Analysis of the entities found on the page
-Most used words at the beginning of a sentence
-Competitive Analysis

What I would like to see
-Analysis of the entities found on the first 20 SERPs
-Main optimized lexical fields of the page first 20 SERPs
-Relevant main keywords and presence in the tags first 20 SERPs
-Most used words at the beginning of a sentence first 20 SERPs

My Concern with a lot of these independent developers are forming a dependency on a tool for my work flow and creating SOPs then developer stops updating and tool dies.
Would love for the developer to use the support on AppSumo to build a dedicated team to keep the tool going. I think it is unique enough that alot of SEOs will want this in their tool kits. IT complements tools like frase, writerzen and closerscopy very nicely.

All in all this is a great SEO tool that takes a different perspective than most others right now. Tools like this are the future of SEO, not just keyword research and on page audits but digging into the actual meat of the content to help you understand the topic and how to bring across your points. It's also refreshing to see a tool like this without "AI" to mess things up.