Greg - SiteOrigin

Easy Reader adds a button to all your posts. When your users click this, they’ll see an easy-to-read version of content. Check out the <a href="http://siteorigin.com/2010/easy-reader-plugin/" rel="nofollow ugc">demo of Easy Reader</a> – your readers will appreciate this feature.
Easy Reader also lets you add and customize a selection of social media badges at the bottom of your post (everyone loves to share).

Easy Reader

Easy Reader is a WordPress plugin that lets your readers open an easy to read version of your blog posts.

techlogica

Adds an accessibility panel with controls for brightness, saturation, font size, spacing, and dark/light mode.

Adjust Accessibility

Adds an accessibility panel with controls for brightness, saturation, font size, spacing, and dark/light mode.

Easy Reader vs Adjust Accessibility