Text to Speech for Dyslexia: Does It Help, and How to Use It Well
Text-to-speech is the assistive technology with the strongest evidence for dyslexia. What the research shows, why reading along beats listening alone, and how to set it up on iPhone and iPad.
Of all the tools marketed to people with dyslexia, text-to-speech has the strongest research behind it. It's also the easiest to misuse. Here is what the evidence says and how to get the most from it.
What the research shows
A 2018 meta-analysis by Wood, Moxley, Tighe and Wagner in the Journal of Learning Disabilities combined 22 studies with 2,942 participants, from third grade to university. Text-to-speech and other read-aloud tools had an average effect size of about 0.35 on reading comprehension for students with reading disabilities. That's a moderate, statistically significant benefit.
The reason is straightforward. Dyslexia makes decoding (turning letters into words) slow and effortful. That effort uses up attention and working memory that would otherwise go to understanding. When text-to-speech takes over some of the decoding, more of your mind is free for meaning.
Reading along beats listening alone
There is a difference between listening to text and reading along with it. With read-along, each word is highlighted as it's spoken, so your eyes follow the text while you hear it.
Read-along keeps you engaged with the written words. Research on reading while listening has found benefits for comprehension, vocabulary and word recognition over reading or listening alone. We summarise it on our read + listen page. For children, the audio also models what fluent reading sounds like.
How to use text-to-speech well
- Turn on word highlighting. Without it, it's easy to drift into passive listening.
- Start at a comfortable speed, then nudge it up. Many people settle a little faster than their natural reading pace once they're used to it.
- Make the text itself easier to read. Increase the size, add letter and word spacing and choose a clear font. Try combinations in the dyslexia font tester.
- Use it for the reading that matters. Long documents, textbooks, work reports and articles are where it saves the most effort.
- Pick a voice you like. You'll listen for hours, so the voice matters. Natural AI voices are easier on long sessions.
Setting up text-to-speech on iPhone and iPad
Built-in (free): Settings, Accessibility, Spoken Content. Turn on Speak Selection and Speak Screen, and switch on Highlight Content. Select text and tap Speak, or swipe down with two fingers from the top of the screen to hear everything.
For books, PDFs and articles: a reading app remembers your place, gives you playback controls, and lets you change how the text looks. The ClearRead app reads ePubs, PDFs, web articles and pasted text aloud with word-by-word highlighting at 0.5x to 2.5x speed, and adds Lexend and OpenDyslexic fonts, spacing controls, focus mode and custom colours. Read-aloud with system voices is free and unlimited; natural AI voices come with ClearRead Premium.
For other options, including free tools, see the best apps for dyslexia and free text-to-speech apps.
Frequently asked questions
Does text-to-speech help with dyslexia?
Yes. A 2018 meta-analysis of 22 studies with nearly 3,000 participants (Wood and colleagues, Journal of Learning Disabilities) found that text-to-speech and read-aloud tools had a moderate, statistically significant positive effect on reading comprehension for students with reading disabilities.
Is using text-to-speech cheating?
No. Text-to-speech is a recognised accommodation for dyslexia in schools, universities and workplaces, in the same way glasses are for short sight. It gives you access to the content. Reading along with highlighted text also keeps you practising reading.
Will text-to-speech stop my child learning to read?
Used as read-along, where the child follows highlighted words while listening, it supports reading rather than replacing it. The audio models fluent reading. It works best alongside structured reading instruction, not instead of it.
What is the best text-to-speech app for dyslexia?
Look for word-by-word highlighting, adjustable speed, support for your own files, and control over font and spacing. On iPhone and iPad, ClearRead does all of these for free with system voices. Our comparison of the best apps for dyslexia covers other options, including free built-in tools.