Three blocks that make a long page easier to read: a contents list, a reading time and a row of related posts.
The contents list is built from the headings on whatever page you put it on, in the reader's own browser, every time. Nothing to type and nothing to keep up to date. It handles a post written entirely in one heading level too.
It runs on Studio, the classic editor and Harmony.
Everything a reader sees is free, on every plan. The list follows the reader and marks where they are. The reading time is counted from the article itself, at your own words-a-minute figure and in your own wording, with a word count and a progress bar. Related posts come from your own list of your own pages, matched against the words on the page being read. Every arrangement and every design control is free, with no cap on placements, headings, words or posts.
There is no watermark and no badge on any plan, ever.
It never connects to your blog: no permission into your posts, no sync, no copy of your content, nothing stored about a reader.
Pro adds a set-up per page, hand-picked related posts and tag matching. Business adds CSV both ways, structured data and a link map that finds orphans.