Well, you are right... but most laptops, phones, and tablets have settings that you can esily get to where you can quickly change the brightness of the screen. Then all of your websites you visit will have the problem solved :)

Good idea Justin! Voted up

I was about to post about this. I Push for a dark mode on anything I use frequently, and I use khan academy every day...please give us this.

Still waiting for this to happen! 

So. I figured it out for windows users.

Option A: Windows Key and the '+' key (next to backspace) opens windows Magnifier. Set zoom to 100% and click on the settings button and select invert colors.

Option B: Enable Chrome's high contrast settings. Choose one of the many free dark themes.

I have windows 7 so option B worked better for me. Happy Khanning

great idea i have duckduckgo search engine and you can set the background to black it is so much easier to read day or night.

#############################################################################
SOLUTION: DarkReader
The solution is as simple as a browser extension.
The extension called Darkreader. Darkreader converts ANY site into dark theme, it is free, open source, and is available for Firefox and Chrome.
From my experience, it does its job really well.

Chrome:
https://chrome.google.com/webstore/detail/dark-reader/eimadpbcbfnmbkopoojfekhnkhdbieeh?hl=en-US

Firefox:
https://addons.mozilla.org/en-US/firefox/addon/darkreader/

PRO TIP: open the extension menu, and click the link right below the button in the upper left corner and bind "toggle current site" to Alt+Shift+S.
This makes it easy to flip a site to light theme super easy just Incase something doesn't look right.
#############################################################################

Edit 4/8/2019: add links
Edit 1/7/2021: Add lines at top and bottom to make it stand out more because people are still complaining that they don't have dark theme and I get emails about it

Also, for those using Khan Academy in the Android or iOS app, you can set night/dark mode to come on automatically for the device. Note that this setting is done in the settings for both operating systems, not in the Khan Academy app itself, and it is then applied to all apps you run on this device, not just Khan Academy.

The next thing you're going to ask me is for step-by-step instructions on how to do this. Unfortunately, Android changes the names and hierarchies of a lot of settings options with each new release, and iOS does stuff like this, too. So if I do this for what my phone and iPad look like, it may not be what yours contains. Therefore, I suggest that you explore Settings on your device and find the place where you can set this.

i use this add on https://chrome.google.com/webstore/detail/midnight-lizard/pbnndmlekkboofhnbonilimejonapojg

is very personalisable but there are still some bugg. specialy in this https://www.khanacademy.org/computing/computer-programming king of course. som etime the letter turn black color. no wite. so i wish this get fix one way ou the other. this add on is the less bug i have tried at any web page.

Try this Chrome extension (Dark Reader): https://chrome.google.com/webstore/detail/dark-reader/eimadpbcbfnmbkopoojfekhnkhdbieeh?hl=en

Your eyes will thank you!

Come on. The website is super duper good looking and doesn't have a dark mode! Why think of extensions and settings? Such a high end page is expected to have this setting. But yeah, we are here to study. We can stop worrying about such fancy features.

Regards,

Aritro 

Screen is really bright! And because i am a night owl it really hurts my eyes!

Dark Reader is both a Chome and Firefox extension, and works really well with Khan Academy!
It would be better to just have native support though...

I wish the apps and the website had a dark mode. The website should use prefers-color-scheme, a css media query, to listen to the system/browser's theme. Oh and just while I'm here I want to complain about how the toolbar changes to white when you hover over it. So annoying. Wasn't the website recently redesigned? How come a dark mode wasn't part of that?

In addition to Dark Reader, there's also Stylus, another extension that lets you use styles from userstyles, and Chrome let you force websites to be dark. That option is always on though, regardless of whether Chrome is in light or dark mode.

I have a dark mode installed through my browser. However, it's not perfect at all. If i use the scratch pad thingy on the math tests, the default color will be nearly the same as the dark mode background. And there are a few other different issues...  

A supported dark mode would be a lot better.

Edit after 9 months: I use Opera GX, a version of Opera designed for gamers. This function is built-in, so no need for finding the right extension. It also has the option to be turned off, except for 1 or several specific websites. Adding [*.]khanacademy.org (asterisk for subdomains, like this support page) would mean every website is displayed normally, except for KA. I hope Opera will add a customisation feature to this dark mode, like to adjust the background color to a mid-dark gray instead of near black.

You can add this extension to chrome for dark mode.

It's awesome!

https://chrome.google.com/webstore/detail/night-eye-dark-mode-on-an/alncdjedloppbablonallfbkeiknmkdi?hl=en

With the global pandemic and having to look at a screen for hours a day, dark mode will help a lot. The chrome://flags force dark mode is useful for many websites but it makes khan academy unusable. 

I think being able to turn my background black would be cool, but what if we could use the backgrounds that we earn to along with the basic colors red, blue, pink, green, black, and wight. 

That would definitely be nice, but we do need some dark color to reduce eye strain when we are looking at our screens for 6-9 hours a day

I use f.lux.  It decreases the overall light, along with filtering out blues and greens.

Yes, please support a dark mode. Or, even better please support multiple themes, such at a black/dark background, a high contrast theme, and a colorblind theme.

The white background and blue buttons are hard on the eyes and bad for human health.

Love everything Khan Academy is doing!

I use Firefox with the Dark Reader extension and it causes issues thanks to lack of support.

More in the thread here: https://support.khanacademy.org/hc/en-us/community/posts/360078169912-Basic-logic

Dark mode needs to be supported.

Dark mode will help to bring in more people, and will also help those who study late nights, making it easier with less eye strain.

Can't wait for the dev team to get it ready!

Personally, I think it would be better for Khan Academy to integrate their own dark mode function for the site than for users to rely on extensions from third-parties. 

I agree with T4Theos! Dark mode is almost an essential feature in modern websites. I currently use Dark Reader extension but it would be very useful if we have native dark mode especially for the mobile app since we cannot use any extension in android :)

I think Khan Academy should add a dark mode for students studying for long hours. It will be quite good. I think they should because some students, like me, study until 11 pm, as white light might harm the naked eye. 

After this, it has been repeated many times that a dark mode should be added.

Lots of people study at night

Well, I sometimes do!