What on-page SEO checker really helps to improve a website?

[areny]

I decided to tighten SEO on my site, but it takes a long time to check everything manually, and online services give different information. Is there a normal on-page SEO checker that shows errors without unnecessary water? I want something understandable and useful, not just a list of technical terms.

[beenastyle]

There are some handy tools for checking on-page SEO, but it's important that it shows real errors and not just general advice. I use this on-page SEO checker, it gives a detailed analysis from keyword density to header structure https://pr-cy.io/tools/content-analysis/ It looks clear, and you can immediately see what needs to be improved to make the site more search engine friendly.