Yes, Clickx detects and extracts H1, H2 and H3 tags by default and creates reports on multiple H1s and missing H1s throughout pages on your website. An H1 tag is your main website title or emphasized text that will appear as the top header and is the largest, in terms of font size and hierarchy. The second largest tag would be H2, followed by H3, H4, etc.
Clickx does not detect H4, H5, and H6 tags. However, it can be done using DeepCrawl custom extraction. Here's an example report of identifying missing header tags would look like:
As you can see in the example, there are no missing H2 and H3 tags but there are missing H1 tags in the URL shown.