Atkinson Hyperlegible is the font I use for almost everything when I get a choice. In addition to features that make it suitable for those with visual impairments, it has features that are supposed to accommodate dyslexics. There isn’t much in the way of subtlety, but it is exactly as they claim: Hyperlegible.

Although it’s available on Google Fonts, getting it directly from the Braille Institute gets you all variants for print and web.

There is a license agreement that looks scary because it’s available only as a PDF, but it’s only 2 pages telling you can do anything you want as long as you don’t sell it directly or use their registered name for anything other than a citation when making derivatives.