“Bionic” Font – usable in every program

From the explanation

> The basic idea is to substitut the first few letters with their bold variant.

> As a result, the reader is only focusing on the highlighted initial letters and lets the brain center complete the word. This allows you to read in supersonic speed.

And from their first reference [1]

> After analyzing data from 2,074 testers, we found no evidence that Bionic Reading has any positive effect on reading speed. In fact, participants read 2.6 words per minute slower on average with Bionic Reading than without. That said, the difference here is so small (less than 1%), that the real takeaway is Bionic Reading has no impact on reading speed.

[1] https://blog.readwise.io/bionic-reading-results/

The boundaries between bold and plain characters break words in half instead of facilitating reading in any way.