Some speed‑reading apps make big claims. But how fast can humans actually read?

Speed-reading apps often assert that users can dramatically increase their reading speed, claiming to be able to read up to 1,000 words per minute or even more. However, scientific evidence suggests otherwise. A 2019 meta-analysis of 190 studies found that adults typically read silently at a rate of 175-300 words per minute when reading English nonfiction and 200-320 words per minute for fiction. The higher rates for fiction may be due to the content's greater engagement or readability.

The process of reading involves rapid eye movements called saccades, followed by brief pauses called fixations. Visual processing occurs during fixations, while language processing continues during saccades. Fixations typically last 200-300 milliseconds, varying depending on the word's familiarity. During reading, we usually perceive two to three letters to the left of fixation and seven to eight letters to the right.

Popular speed-reading books and apps claim that readers can process 10-14 words in a single fixation, contradicting the evidence. A study of readers who took speed-reading courses showed they were merely skimming through text, with comprehension declining as their skimming rate increased. Speed-reading technologies like Bionic Reading, BeeLine Reader, and Spritz also claim to boost reading speed but have been found to have negligible effects or even reduce comprehension.

A 2024 study found no significant difference in reading rate or comprehension between users of Bionic Reading and those reading in the conventional manner. Similarly, a 2022 study comparing children's reading of normal text with text displayed using BeeLine Reader found that while it helped second-grade readers progress through densely formatted text, it hindered comprehension for third-grade readers. Children also reported BeeLine Reader to be less convenient and less enjoyable than conventional reading.

A computer model called E-Z Reader was used to examine the theoretical upper limit of reading speed. When calibrated to university students' eye movements during reading of simple declarative sentences, E-Z Reader provided a baseline reading rate of 307 words per minute, near the upper limit of human capability. When eye movements were perfect, allowing accurate fixation on word centers and maximum speed identification, the reading rate increased to 318 words per minute—only a 3.6% improvement.

When both eye movements and eye shifts between words were eliminated, the reading rate increased to 429 words per minute, a 39.7% improvement. However, this speedup came at a cost, as it significantly reduced comprehension.