It is a real gem. Pulno checks incredbile amount of parameters and also gives you tips on how to deal with the found issues. There are tooltips with not only explanation but also links to more materials and a list of pages affected by a certain issue. There are different tools featured too like Website Structure Visualization where you can SEE how does your website look like or Backlink Checker or Content Analyzer or a tool that let's you monitor changes on your site. On top of that you can integrate Pulno with GSC granting data in a whole new level.