Somebody told you to look for dyslexia-friendly books and then didn't explain what one is. So here it is, as a list of physical facts you can check with your own hands. Off-white or cream paper instead of bright white, because white paper glares. A typeface drawn so that b and d sit still instead of swapping places. Bigger gaps between the letters and between the words. Short lines, wide margins, plenty of white space, and no text laid over the top of a picture. A ragged right edge rather than a justified block, so every line ends where it ends. And a story aimed at your child's real age while the words stay easy, with both numbers printed on the book. Every book here does some of that on purpose, and this page says which does what. You pick by your child's age and what makes them laugh.
Three of these — Snug, Blamehounds and Mind the Gap — are Barrington Stoke books, and that is the most useful thing on this page. Barrington Stoke is an Edinburgh publisher whose entire list is built this way deliberately: cream tinted paper rather than white, a specially designed easy-read font, and every book edited and laid out so the page never crowds. They print the reading age on the book next to the age the story is written for, which almost nobody else does. So if one of these lands with your child, you haven't found a book. You've found a publisher with dozens more, and you can walk into a library, say the name, and be handed a pile. That's worth more than any single title here. Here's Hank is doing a different thing. It's an American series, and it was the first in the US printed in Dyslexie — a font drawn by a designer who has dyslexia himself. The b and the d are weighted along the bottom so they don't flip. The c and the e are cut wider open. The spaces between letters and words are bigger than normal, and every capital is bold so your child can see where a sentence starts. Henry Winkler wrote the books, and Winkler was in his thirties before anyone told him he was dyslexic and that his whole miserable school career had a reason. Hank is a boy who cannot make school work. So Barrington Stoke gives your child the format. Here's Hank gives them the format and a boy on the page who reads the way they do. If your child has decided they're the stupid one, that second thing is the one that matters. The ages here run from five to the mid-teens, and that spread is the point. A twelve-year-old who reads like an eight-year-old has almost nowhere to go: the books at their reading level are about losing a tooth, and the books about their life are four hundred pages of small print. Mind the Gap is the answer — a teenage novel at a reading age of eight or nine. Hand that same twelve-year-old Here's Hank and they will feel patronized, and they will be right about it. Go by your child's age first. The reading level here looks after itself.