Color individual characters, numbers, or words on pages you view to induce grapheme-color synesthesia as you surf the web.
Users
351
0 in 30 days
Rating
4.2 / 5
unchanged in 30 days
Ratings
30
0 in 30 days
Store rank
#50K
#42K among extensions
Version
1.18
updated 30 Jun 2026
Users
monthly, 3 years
Latest, 15 Oct 2026:351 usersMove the mouse over the chart for any month
Ratings count
monthly, 3 years
Latest, 15 Oct 2026:30 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Synesthetize - activate your synesthesia
A study by scientists in the Netherlands has shown that it may be possible to induce color-graphemic synesthesia (viewing letters as having an innate color) by reading text containing letters with a consistent color coding.
Replicate their experiment at home with the synesthesia-inducing Synesthetize Chrome extension. You can now develop your color-letter, color-number, or color-word synesthesia as you surf the web. Synesthetize can be configured to color as many or as few words, letters, or numbers as you want in the colors you prefer to customize the effect to your liking. If you have synesthesia, you can even color-code letters, words, or numbers to specific colors that match your existing synesthetic association.
You can also quickly disable the extension for certain websites if you'd prefer those specific sites to not be color-coded.
Now supports pages where content loads gradually, e.g. infinite scroll websites or comment sections.
Read the study that inspired the extension: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0039799
Support me https://tiptopjar.com/soggytiger
Source available at: https://github.com/gsavvas/Synesthete