rainbow-text

Name: rainbow-text
Rating: 5 (1 reviews)
Author: David Breneisen

Changes the color of each character (A-Z, 0-9) on a webpage.

As of June 2026, rainbow-text has 131 users and a 5.00/5 rating from 1 reviews in the Education category.

David Breneisen Education

Chrome Web Store ↗.crx

Users−3.0%

131

Rating0%

5.00

1 reviews

Reviews0%

Version

0.4

Manifest V3

90-day change · In the last 90 days this extension 1 version update.

History

4 snapshots

Tracking since Apr 29, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 29, 2026	135	5.00	1	0.3
May 26, 2026	130	5.00	1	0.3
Jun 2, 2026	126	5.00	1	0.4
Jun 8, 2026	128	5.00	1	0.4
Now	131	5.00	1	0.4

Changelog

May 26, 2026

description

Simulate and train grapheme synesthesia. With enough time and practice this may improve cognitive abilities such as color perception and visualization, reading comprehension and speed, memory, and verbal abilities.
(https://pmc.ncbi.nlm.nih.gov/articles/PMC4235407/).

Open source: https://github.com/davebren/rainbow-text

When enabled for a website this extension will modify all of the characters A through Z and numbers 0 through 9 to a unique color. You can use the default colors or you can pick your own. 

In order to provide a reliable experience the extension is currently enabled with an opt-in policy for each website. Not all websites will function correctly when it is enabled.

Enabling dynamic content will allow the extension to execute as text is added to the webpage.

The default colors will work best on dark themed websites. Other extensions can be used to apply a dark theme to all websites, but it may also slightly modify the text colors.

Play training games to improve faster and eventually learn to read text only by color. Then enable hardcore mode for some fun.
 
Feedback is welcome on the github page.

Simulate and train grapheme synesthesia. With enough time and practice this may improve cognitive abilities such as color perception and visualization, reading comprehension and speed, memory, and verbal abilities.
(https://pmc.ncbi.nlm.nih.gov/articles/PMC4235407/).

Open source: https://github.com/davebren/rainbow-text

When enabled for a website this extension will modify all of the characters A through Z and numbers 0 through 9 to a unique color. You can use the default colors or you can pick your own. 

In order to provide a reliable experience the extension is currently enabled with an opt-in policy for each website. Not all websites will function correctly when it is enabled.

Enabling dynamic content will allow the extension to execute as text is added to the webpage.

The default colors will work best on dark themed websites. Other extensions can be used to apply a dark theme to all websites, but it may also slightly modify the text colors.

Play training games to improve faster and eventually learn to read text only by color. Then enable hardcore mode for some fun.
 
Feedback is welcome on the github page.


Version log:
0.4:
- Added support for spanish characters like accents and umlauts. These use the same colors as the normal letters have their own block glyphs so they can be differentiated.
- Hardcore mode now uses circles for lowercase characters and squares for uppercase.
- Donation support button.

Permissions & access

Permissions: tabsactiveTabstorage
Host access: None declared

Screenshots

About

Simulate and train grapheme synesthesia. With enough time and practice this may improve cognitive abilities such as color perception and visualization, reading comprehension and speed, memory, and verbal abilities.
(https://pmc.ncbi.nlm.nih.gov/articles/PMC4235407/).

Open source: https://github.com/davebren/rainbow-text

When enabled for a website this extension will modify all of the characters A through Z and numbers 0 through 9 to a unique color. You can use the default colors or you can pick your own. 

In order to provide a reliable experience the extension is currently enabled with an opt-in policy for each website. Not all websites will function correctly when it is enabled.

Enabling dynamic content will allow the extension to execute as text is added to the webpage.

The default colors will work best on dark themed websites. Other extensions can be used to apply a dark theme to all websites, but it may also slightly modify the text colors.

Play training games to improve faster and eventually learn to read text only by color. Then enable hardcore mode for some fun.
 
Feedback is welcome on the github page.


Version log:
0.4:
- Added support for spanish characters like accents and umlauts. These use the same colors as the normal letters have their own block glyphs so they can be differentiated.
- Hardcore mode now uses circles for lowercase characters and squares for uppercase.
- Donation support button.