Does Bionic Reading Work? What the Research Says for ADHD and Dyslexia
Bionic reading bolds the start of every word and claims to help you read faster. Here is what a 2024 eye-tracking study found, why some ADHD readers still like it, and what to try instead.
Bionic reading went viral in 2022 with a simple promise: bold the first half of every word and your brain will read faster, because your eyes only need the start of each word to recognise it. Millions of people tried it, and many, especially people with ADHD, said it felt easier.
So does it work? The short answer from the research is no, not in the way it is marketed. The longer answer is more interesting.
What bionic reading does
It bolds the beginning of every word:
Bionic reading bolds the start of every word.
The idea is that the bold letters act as "artificial fixation points", guiding your eyes along the line while your brain completes each word. Bionic Reading is a trademark of Bionic Reading AG, which sells apps and browser extensions, but the same formatting is now built into many readers.
What the research found
In 2024, Joshua Snell at Vrije Universiteit Amsterdam published a pre-registered eye-tracking study in Acta Psychologica, bluntly titled "No, Bionic Reading does not work".
Readers read many paragraphs in both normal and bionic formats. The bolding did change where their eyes first landed on long words. But it made no significant difference to reading time, word skipping or comprehension, and this held for both fast and slow readers.
In other words, the bold letters move your eyes around, but they do not help you read.
Why people still say it helps
If it doesn't work, why do so many people like it? A few likely reasons:
- Novelty and attention. A new format can make you pay closer attention for a while, especially with ADHD.
- A page that looks less dense. Bold anchors break up a wall of text, which can lower the effort of starting.
- Feeling faster. How fast reading feels and how fast it is can differ.
None of these are nothing. If bionic reading helps you start and keep reading, that is valuable. Just don't expect it to raise your speed or understanding, and don't use it for material where precision matters if it makes you skim.
What has better evidence
If you are trying to read more easily with dyslexia or ADHD, these have stronger support:
- Read along with audio. A 2018 meta-analysis of 22 studies found text-to-speech and read-aloud tools improved reading comprehension for students with reading disabilities. Hearing each word while it is highlighted also paces your reading, which helps attention.
- Add letter spacing. Extra letter spacing improved reading speed and accuracy for children with dyslexia.
- Keep your place. A focus line that dims the surrounding text helps readers who lose their place or get distracted by what's next.
- Choose a clear font and a comfortable size. See the best fonts for dyslexia.
Try it yourself
The honest answer is to test it on your own reading. Paste something into our free bionic reading converter and compare it with plain text at a larger size with extra spacing, set up in the dyslexia font tester. Or time yourself both ways with the reading speed test.
If you like it, the ClearRead app can apply bionic reading to your own books, PDFs and articles, and combine it with read-along text-to-speech and focus mode, which are the tools with better evidence behind them.
Frequently asked questions
Does bionic reading actually work?
Not for reading speed or comprehension, according to current research. A 2024 eye-tracking study by Joshua Snell in Acta Psychologica, titled 'No, Bionic Reading does not work', found the bolding shifted where readers' eyes landed but produced no difference in reading time, word skipping or comprehension.
Does bionic reading help with ADHD?
There is no published evidence that it helps ADHD readers specifically. Some people with ADHD say the bold letters make a page feel less daunting or help them stay on the line. If it helps you keep reading, that is a real benefit, even if it does not make you faster.
Is bionic reading good for dyslexia?
There is no evidence that it helps dyslexic readers, and some find the mix of bold and regular letters harder to decode. Reading along with text-to-speech and increasing letter spacing both have stronger evidence.
How can I try bionic reading for free?
Paste any text into the free ClearRead bionic reading converter to see it with the first letters of each word bolded. The ClearRead app for iPhone and iPad can apply bionic reading to whole books, PDFs and web articles.