You read the same paragraph three times and still couldn't say what it was about. Your eyes slide to the next line, or keep moving while your mind is somewhere else entirely. For a lot of people with ADHD, that's what reading feels like, especially with long or dull text.
A voice changes that. It moves at a steady pace, so you don't have to keep pushing yourself forward. When you follow along with your eyes at the same time, your eyes and ears are busy with the same words, and there's less room for your mind to wander off. Many people with ADHD say it's the only way they get through textbooks, long emails and work documents.
There's some research behind it too. A 2026 study of school students in Taiwan, which tracked their eye movements, found that hearing the text read aloud improved understanding for students with ADHD who struggle with reading. It didn't help students who read easily. Read the study.
To be clear: text to speech is a reading tool, not a treatment. It doesn't change ADHD. It just makes reading less of a fight for a lot of people.