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Circadian

Circadian

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A browser extension that tints pages by time of day (daytime, sunset, bedtime).
Type
Extension
Users
39 users
12
Pas
View author page of Pas
Published
Published on November 4, 2025
Version 1.0.4
Manifest version
3
Updated
Updated on November 10, 2025
productivity/tools
Extension Category
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View Circadian Chrome Extension on Chrome Web Store
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Circadian Chrome Extension Image 1

Description

Circadian is really simple. It creates an invisible element over your whole web page, then applies a CSS filter to it! There's a bit of math involved to calculate the RGB values from the blackbody radiation scale, but that's essentially it!

Philosophy: Blue-light impacts our sleep and overall health by disrupting melanopsin receptor's normal function that calibrates our circadian rhythm. This extension's creation was inspired by f.lux's ability to adjust your device's color profile temperature based on the time of day to aid in preventing this. It's not perfect (this extension definitely isn't) but it's a simple tool many users use to help.

The idea: I was checking out some dark reader Firefox addons when I asked myself if any of these dark reader addons had temperature adjustments? I suspect not. And if I were to make an extension, I could use Orion on my iPhone to install my extension and essentially get f.lux on my iPhone! (Apple shut down f.lux's app) Obviously it's not system wide, but still kinda neat!

You can even pair Circadian with other dark reader extensions to get the best experience!

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