Open source SEO tool that uses your own DataForSEO api key?

tldr; is building an open source UI wrapper for DataForSEO APIs useful? I think this would be wayyyy cheaper than Ahrefs / Semrush and helpful to non devs?
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Hi, I'm a software engineer, not an SEO person. I wanted to do some keyword research yesterday and was surprised by how expensive Ahrefs / Semrush were.

I've been doing some research today and it seems like DataForSEO has pretty extensive APIs exposing lots of the data available in these tools. It seems like some people in this reddit have even hooked up Claude Code to their APIs.

I'm really into the idea of building open source alternatives to expensive SaaS tools. It seems like this could be a great case where a similar tool could be built and cost 10x less for users if they use DataForSEO directly. The missing piece right now is just a nice UI?

Before I dig too much deeper into this, just was wondering if anyone more experienced with SEO could point out any essential features DataForSEO is missing or any other reasons why building a wrapper around those APIs isn't very valuable.