A work-in-progress homebrew YouTube client for the 3DS
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As this app is still in the alpha stage, you may and will encounter crashes and other bugs.
If you find one of those, it would be helpful to open an issue on this GitHub repository.

It utilizes some undocumented YouTube APIs to get the raw video url and plays the stream using the decoder taken from Video player for 3DS by Core-2-Extreme.
It does not run any javascripts or render html/css, so it's significantly faster than YouTube on the browser.
The name is derived from the fact that it is the third YouTube client on 3DS, following the official YouTube app (discontinued) and the new 3DS browser.

You can use the qr code below to download & install .cia from 3ds(Thanks @Minionguyjpro)

• Video Playback up to 360p
  480p might be possible and could be considered in the future development
• Livestreams and premiere videos support
• Searching
• Video suggestion
• Comments
• Captions
• Local watch history and channel subscription
• No ads
  It's more like "Ads are not implemented" rather than "We have ad-blocking functionality".
  Of course, I will never "implement" it :)

• B button : go back to the previous scene
• C-pad up/down : scroll
• L/R : switch between tabs
• Select + Start : blackout the bottom screen
• In video player
  • Arrow left/right : 10 s seek

Below are for debug purposes

• Select + X : toggle debug log
• Select + Y : toggle memory usage monitor
• Select + R + A : toggle FPS monitor

A 3DS (including 2DS) with Luma3DS installed and DSP1 run.
I haven't tested the minimum system version, but at least 8.1.0-0 is needed.

• Does it make sense?
  The worst question in the console homebrew scene. Isn't it just exciting to see your favorite videos playing on a 3DS?

You need:

• devkitPro with devkitARM r58
• 3ds-zlib and 3ds-mbedtls installed in portlibs of devkitPro
  You can install it by opening devkitPro msys2 and typing pacman -S [package name].

Type make (if you are on Linux) or make all_win (if you are on Windows) to build it.

• Building of dependency libraries(optional)
  For ffmpeg, libbrotli, and libcurl, follow built.txt in each directory
  For libctru, just type make in library\libctru\source\libctru

You can use the code under the terms of the GNU General Public License GPL v3 or under the terms of any later revisions of the GPL. Refer to the provided LICENSE file for further information.

by the FFmpeg developers under GNU Lesser General Public License (LGPL) version 2.1
The modified source code can be found in https://github.com/windows-server-2003/FFmpeg/tree/3ds.

by Tencent and Milo Yip under MIT License

by devkitPro under zlib License

by Daniel Stenberg and many contributors under the curl License

by the Brotli Authors under MIT license

by Sean Barrett under MIT License and Public Domain

• Core 2 Extreme
  For Video player for 3DS which this app is based on.
  Needless to say, the video playback functionality is essential for this app, and it would not have been possible to develop this software without him spending his time optimizing the code sometimes even with assembly and looking into HW decoding on the new 3DS.
• dixy52-beep
  For in-app textures
• PokéTube
  For the icon and the banner
• The contributors of youtube-dl
  As a reference about YouTube webpage parsing. It was especially helpful for the deobfuscation of ciphered signatures.
• The contributors of pytube
  As a reference about YouTube webpage parsing. Thanks to its strict dependency-free policy, I was able to port some of the code without difficulty.