Are there some SEO-Tools you're missing?

Hello guys,

as I developed my first little SEO-Tool lately, which is only availible in German so far (https://pagespeedstudies.de) - I might offer different versions according to the country but first I have to seperate these results from the case study.

I would like to build more tools. Obviously it is a big market and most of the Tools are availible. I still think that there are some missing tools - might be some small tools - which I could provide.

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Looking forward to some nice ideas and a little discussion.