Is text to speech or speech to text better for dyslexia?

The answer depends on the task. Text to speech reads words aloud, which helps with reading and checking. Speech to text turns your voice into words, which helps with writing. Dyslexia affects both, so the right tool depends on whether you are taking in text or producing it. A practical routine uses both: speech to text to write, and text to speech to check. For the wider picture, see our guide to speech to text for dyslexia and dysgraphia, part of our accessibility and health guides.

Text to speech helps with reading, and it has the stronger research base

Text to speech is the better-supported tool for reading. A 2018 meta-analysis of text-to-speech and related read-aloud tools, for students with reading difficulties, found an average weighted effect size of 0.35 on reading comprehension ¹. An effect of 0.35 is modest, and the result is about comprehension, not about writing or proofreading. It is still the most consistent controlled evidence for either tool in this topic.

Use text to speech when the task is to take in text: a textbook, a worksheet, an email, or a web page you need to understand. Reading aloud lets you hear the sentence and the meaning together, which can help when decoding a word slows you down.

Speech to text helps with writing, but the evidence is small

Speech to text has been studied for writing, mostly with small samples and older software. In a 1995 study, 29 university students with learning disabilities wrote essays with a speech recognition system, and the essays received significantly higher holistic scores than essays written without assistance ². A 2024 single-case study of eight middle school students found that seven of the eight increased their text productivity when they wrote with speech to text, compared with keyboarding ³.

Not every study finds a gain in length. In a 2002 study, essay length did not differ significantly between speech recognition, human transcription and keyboarding ⁴. So speech to text is best understood as a way to get ideas onto the page with less spelling and motor work, not a guaranteed way to write more.

Speech to text makes errors that you must hear and catch

Dictation has its own kind of mistake. In a 2026 qualitative study of four students with dyslexia, the most frequent technology-based errors were misrecognized single words and omitted words or parts of sentences ⁵. These errors are hard to catch on a screen, because the text looks correct while its meaning has shifted.

This is where text to speech earns its place. Listening to the draft catches what the eye misses. Mac Dictation also helps by marking uncertain words. Apple says ambiguous text is underlined in blue, for example when it writes "flour" but you meant "flower" ⁶.

It depends on the task, so match the tool to the job

The research does not test the two tools against each other for the same person, so the table reflects the evidence for each task rather than a direct comparison.

Use both: dictate in short pieces and read each piece back

The routine that combines the two tools is simple. Dictate one paragraph at a time, then have it read back before you move on. On a Mac, turn on Speak selection in the Read & Speak settings, and use its keyboard shortcut to hear the selected text. The default shortcut is Option-Esc ⁷. In Dragon, the Read That feature reads editable text aloud in a computer voice ⁸.

1. Dictate one paragraph with the cursor in the document.
2. Select the paragraph and have it read aloud.
3. Listen for words that sound wrong, and look for blue underlines on Mac.
4. Correct the misheard words, then move on.

The steps are the same whichever app you use. If you are unsure which tool suits your situation, our question on what speech to text is explains the difference between the two functions, and our question on how to proofread dictated text covers the checking step in more detail. If you want to know whether the software needs training to recognize your voice, see whether you need to train dictation to your voice.

For the school and work side of these tools, the guide to speech to text for students with disabilities and our guide to dictation as a workplace accommodation explain how to ask for them. This page explains the tools and the evidence, and it does not replace advice from a qualified professional about your own needs.