f.lux 22.0

f.lux Software LLC ❘ 0.6MB ❘ Freeware ❘
Android Windows
out of 6613 votes

Transform Your Screen Experience with f.lux

Boris Weber

06/11/2025

f.lux intelligently adjusts your computer display's color temperature to reduce eye strain by adapting to the time of day, making it a must-have for late-night work or gaming.

f.lux: Enhance Your Nighttime Screen Experience with Ease

f.lux is an innovative software application designed to optimize your screen lighting for healthier late-night usage. By reducing blue light exposure, f.lux helps you wind down more naturally, potentially improving sleep quality. As a versatile tool, it is compatible with a wide range of rooted Android devices, particularly those running Lollipop and Marshmallow (5.x and 6.x), making it an excellent choice for tech-savvy users seeking improved screen comfort.

Key Features of f.lux

Blue Light Filtering: Adjusts your screen’s color temperature based on the time of day, minimizing eye strain and promoting better sleep hygiene.
Customizable Settings: Fine-tune your preferred warmth levels and scheduling options to suit your lifestyle.
Automatic Adjustments: Seamlessly transitions between day and night modes without manual intervention.

Compatibility and Requirements

Designed primarily for rooted Android devices, with optimal performance on those running Android Lollipop and Marshmallow (5.x and 6.x).
Some testers have experienced compatibility with rooted KitKat (4.x) devices, although this may vary.
Note: Compatibility issues may occur with certain Samsung Galaxy models, so check your device specifics.

Known Limitations and Issues

The app may not function correctly on some Samsung Galaxy smartphones due to firmware restrictions.
Users might experience screen flashes during app updates via Google Play, which is a known bug.

How to Uninstall f.lux Safely

Disable f.lux within the app settings before proceeding with uninstallation.
If issues persist, perform a reboot after removing the app to ensure stability.

Share Your Feedback

We welcome user input in the form of bug reports and feature suggestions. Your valuable feedback helps us improve the application and enhance user experience. Feel free to contact us with any questions or comments—your contributions are greatly appreciated.

Overview

f.lux is a Freeware software in the category System Utilities developed by f.lux Software LLC.

The users of our client application UpdateStar have checked f.lux for updates 157 times during the last month.

The latest version of f.lux is 22.0, released on 02/22/2024. It was initially added to our database on 02/09/2021. The most prevalent version is 4.137, which is used by 100% of all installations.

f.lux runs on the following operating systems: Android/Windows. The download file has a size of 0.6MB.

Users of f.lux gave it a rating of 3 out of 5 stars.

Pros

Helps reduce eye strain by adjusting screen brightness and color temperature based on time of day
May improve sleep by reducing blue light exposure in the evening
Customizable settings allow users to adjust preferences for color temperature and transition speed

Cons

May not provide significant benefits for all users
May distort colors on the screen, affecting accuracy for tasks that require color precision
Requires users to share location data for precise time-based adjustments

FAQ

What is f.lux?

f.lux is a software that adjusts the color temperature of your display according to the time of day, aiming to reduce eye strain and improve sleep quality.

How does f.lux work?

f.lux works by shifting the color temperature of your display towards warmer, less blue light as the evening progresses, mimicking the natural light cycles.

Is f.lux available for all operating systems?

Yes, f.lux is available for Windows, Mac, Linux, and iOS devices, allowing users on different platforms to benefit from its features.

Can I customize the color settings in f.lux?

Yes, f.lux allows users to customize the color temperature and intensity settings to suit their preferences and specific needs.

Does f.lux have any impact on performance?

f.lux is designed to have minimal impact on system performance, running in the background without significantly affecting the computer's speed or responsiveness.

Is f.lux free to use?

Yes, f.lux is available for free with optional donations to support its development and maintenance.

Can f.lux be disabled temporarily if needed?

Yes, f.lux provides an option to disable its color adjustments temporarily for tasks that require accurate color representation.

Does f.lux have any scheduling options?

Yes, f.lux allows users to set a schedule for color temperature adjustments based on their typical waking and sleeping hours.

Is there a mobile version of f.lux?

Yes, f.lux has a mobile version available for iOS devices, enabling users to benefit from its screen-adjusting features on smartphones and tablets.

Does f.lux reduce blue light emission from screens?

Yes, one of the primary purposes of f.lux is to reduce the exposure to blue light from screens, especially during the evening and night times.

Boris Weber

I am an editor at UpdateStar. I started as a support engineer, and am now specialized in writing about general software topics from a usability and performance angle among others. I telecommute from UpdateStar’s Berlin office, when I am not working remote as a digital nomad for UpdateStar. When I'm not analyzing the latest software updates, you can find me exploring new cities, immersing myself in local cultures, and discovering innovative tech trends across the globe.

Latest Reviews by Boris Weber

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Installations

157 users of UpdateStar had f.lux installed last month.

Latest Version
22.0

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