Red Moon: It Filters Your Screen and Protect Your Eyes Against Blue Light

in utopian-io •  6 days ago

With about 380-500nm wave length, blue light is considered as one of the most dangerous lights because waves with shorter wave length have higher strength.
Everyone knows that eyes must be protected from UV (Ultraviolet) light, but we are doing too little to protect our eyes from the second most harmful light.


Young millennials spend nothing less than 6 hours of day time in front of the screen, it is either our job demand that we spend time looking at the digital screen or we have formed a habit of using social media chat apps that ensure that we are exposed to this light, even in the dark.

About 74% of our teenagers use cell phones or tablets, especially in countries with good economy and reasonable disposable income.

Bad Sight -CCO-

This is not about creating fear, but blue light can lead to total blindness according to medical research. When you destroy the center of your retina, loss of vision is imminent. Adults are more exposed due to low melanin, this protective layer reduces with age. By 60 years, you have almost no melanin to shield you from the effect of blue light. It is almost as if we cannot help it, gadgets are here to stay, we interact with them for business and pleasure. Every digital screen that you are using is a source of blue light. There are solutions;

  • reduce exposure to screen or
  • use blue light protectors

These are the ways we can avoid this light, but the most simple and realistic option is to use application or software that reduces the light to the barest minimum.

Red Moon is an open source android application that let you;

  • dim your phone backlight beyond what phone manufacturer offers
  • control your intensity level
  • change color temperature at will
  • lower phone brightness
  • automate blue light control through the schedule
  • switch between themes

How Red Moon Helped Me To Reduce Blue Lights Effects


Till this very moment, I have not been diagnosed for cataract. I don't have a family history of such disease and I do not pray to have it. But I think my eyes are extremely sensitive to bright screen, especially at dusk.

In realization of this, I informed a friend about this eyes strain, she recommended the Red Moon app to me. Having installed the app on my phone with skepticism, it wowed me with its simple interface, features, and simplicity.

simplicity is the ultimate sophistication, said Leonardo da Vinci.

Almost everything users would expect is on a page of the app, you don't have to scroll down in order to use a feature.

Let's Explore Red Moon


Filter: at the top of the app is the filter that let me choose between custom, reading, default and dim only. Except for custom, all other options are pre-set with different configurations. For instance, I read ebooks a lot on my phone, instead of wasting time on tweaking it to see which setting is best for reading, the app developers have done a great job. So I only need to click on options under the filter and choose reading.
Custom allows me to play around with different color intensity and dim configurations. I can save it with any name, I have filters for watching films, it only makes sense to save it as 'film.'

NB: ensure that you don't filter in such a way that you will squeeze your eyes while you look at the screen.

Automatic Filter: this is really a part that I appreciate so much, it eliminates needs to launch Red Moon every day. I can automate screen filter in a way that it will come up at 6:30p.m. and go off at 6:00a.m. my screen is filtered from dusk to dawn. The 'schedule' is a cool feature, by clicking on it, I can choose between 'start and stop time' or 'times from Sun.'
Here is how the later work, it works by location, so users must give up permission to make use of their location. Except you don't want to allow Red Moon to have access to your location, it is a nice feature that filters your screen even when you travel to different time zone. It uses your location to know when to activate or deactivate filter on screen.

Other Cool Features

Dark Theme: it allows me to switch to a black screen. I am so comfortable with this.
Restore Default Filters: it will override all other filters and bring the first one to the forefront.

Replay Intro: I have used apps that only play intro for the first time that I launched it, going forward, it will not display intro again. The intro is a captivating way to let users know about the app using graphics, by clicking on replay intro, it can be displayed over and over again.

About: this gives more information about the app, this is open source and more translations are welcomed. I would like to work on the app logo and translation if the developer acknowledges my request.


  • I would appreciate if the developer can allow users to activate filter with voice command
  • aside dark theme, other themes should be integrated into Red Moon
  • it will be nice if users can choose background light color

To Wrap It Up

Another way to protect her eyes is through the use of blue light filter eyeglasses, this is an expensive option and it requires the attention of eye specialists. Red Moon provides an internal filter that can be used in electronic devices like phones, it is free and it gets the job done. How many eyes will this app save from getting damaged? This number can only be imagined. If you interact with phone screen a lot in the digital age, protect your vision!

Version Update


Available On



Source Codes
My Github Profile
Series: Nil
Download: Google Playstore, F-Droid, Direct Apk

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Thank you for providing information about the Red moon app. The post is comprehensive and precise. The project seems useful, considering its purpose and efficacy. I appreciate that you chose to write about it. Well done!

On the content side, I appreciate the few personal touches, but the majority hinges on the uses and functions. We value unique information. You could list a set of headlines that are related to the projects and develop them with your thought/experiences. It would make the post to be unique.

Furthermore, the post had style and proofreading issues. I'd urge you to work on improving your writing. Also, Tools like Grammarly and Hemingway may be helpful.

Your contribution has been evaluated according to Utopian policies and guidelines, as well as a predefined set of questions pertaining to the category.

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Thank you for your review, @tykee! Keep up the good work!

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