Fluent Theme [Andromeda and later]

A new version of the Fluent Theme, compatible with the latest MustardOS Andromeda!

This is for Andromeda (and up) version only!
For pre-Andromeda version, see previous Release here on GitHub, which contains up-to-date version for Jacaranda

Changes

• Added Blue variant
• Added support for 1920x1080 resolution
• Added new glyphs for menus
• Changed bootlogo to a monochrome one
• Replaced old system logos with new, high resolution ones for better visuals on bigger screens
• Added new application icons
• Added proper support for Activity Tracker
• Improved spacing and paddings on different resolutions
• Added support for custom fonts (except for the main menu)

Screenshots

TODO: will be added later

Fluent [GOOSE/JACARANDA]

Fluent Theme for muOS Goose/Jacaranda

A brand new theme made with Microsoft's Fluent Design principles in mind, but with some tweaks to make sure it fits the capabilities of handhelds and muOS. This slick, simple and modern theme comes with support for every resolution handled by muOS, new icons from Fluent Icons set, content and application grid mode support and, as always, Polish version built-in.

Variants: Light, Dark, Purple.

Note

This version uses the new way of including grid icons that came with the Canada Goose version (more info here: https://community.muos.dev/t/including-grid-and-box-art-images-for-your-theme-in-canada-goose/825).

Therefore, this theme is incompatible with prior versions of muOS!

License

You're free to use this theme and its assets as a base for your theme. I'll be happy if you mention this theme if you publish it. Thanks!

Updates

Update 2025-09-26

• Added Korean translation (thanks @pipi0935)

Update 2025-09-27

• Minor tweaks to counter and notification styling

Update 2025-09-28

• Changed glyphs for power settings
• Added missing glyphs for web services

Update 2025-10-02

• Updated bar's border to be more visible

Update 2025-10-04

• Added support for a simple, imageless grid in collections (can be disabled by putting a .nogrid file in /MUOS/collection folder)
• Removed unnecessary header from muxlaunch images

Update 2025-10-05

• Added missing icons from Silly Goose update

Update 2025-10-06

• Added more new icons from Silly Goose

Update 2025-10-07

• Fixed sizing of Scrappy icon

Update 2025-10-09

• Added redundant system icons for compatibility

Update 2025-10-11

• Added remaining icons for upcoming Silly Goose

Update 2025-10-12

• Added default app icon

Update 2025-10-17

• Added bigger fonts for bigger resolutions
• Added bigger icons for bigger resolutions
• Added bigger grid icons for apps and systems for bigger resolutions

Update 2025-10-19

• Changed default font size on 480p devices from 20 to 19 to shave off a couple of pixels of width from header titles
• Added French translation (thanks @chronoss0109)

Update 2025-10-22

• Updated font size for main menu screens. It will be bigger for resolutions other than 720x720
• Made app and system grid icons bigger for most resolutions

Update 2025-10-23

• Minor tweaks to grid icon size

Update 2025-10-24

• Added purple variant

Update 2025-10-29

• Added Portuguese (BR) translation (thanks MelquiM)
• Added alternate JP icons for Nintendo and Sega systems

Update 2025-10-30

• Added Spanish translation (thanks @daas88)

Update 2025-11-17

• Added more icons for upcoming muOS release
• Increased size of main menu icons to better correspond to the ones in Apps menu

Update 2025-12-03

• Added missing icon

Update 2026-01-11

• Added new icons for Jacaranda

Update 2026-01-15

• Grid views now come with pre-colored images to allow usage of grid mode for games; recoloring of grid images was disabled

Update 2026-01-24

• Added new icons for muOS Jacaranda
• Added Italian language (thanks, ENiGMiST4)
• Switched the clock and the screen title alignments. Previously some menus had titles that were extremely long and would overlap with the clock when the clock was centered. When title is centered, this no longer happens. So, screenshots below are outdated. I'll update them later.

Update 2026-01-25

• Added overlays for Jacaranda (battery, volume, brightness)

Update 2026-02-05

• Added missing icons for Jacaranda

Update 2026-02-06

• Replaced overlay images with new ones that use theme variant's colors

Update 2026-02-07

• Updated the look of overlays and added images for other resolutions

Update 2026-02-08

• Added new glyphs for Jacaranda

Update 2026-02-15

• Added new glyph

Update 2026-03-09

• Added icons for Super Game Boy, Atari 800, and fixed Intellivision icon name

Screenshots

Minimal Round Grid [Pixie/Goose]

This is an updated version of the original Minimal Round Grid (https://github.com/TheWalruzz/muos-react-theme-toolkit/releases/tag/theme-minimal-round-grid-pixie), made to work fine with both muOS Pixie and Goose.

Changelog

• Added additional NES grid icon after changes in muOS Goose (old one is still available, so this theme is backwards compatible with Pixie)
• Added support for up/down, left/right glyphs in footer
• Optimized all images for a massive reduction in size (it's still a chonky theme, but now it's a little bit lighter)

Update (2025-09-17)

• Added additional SNES grid icon for compatibility with upcoming CANADA GOOSE

Update (2025-09-29)

• Added some newly named icons for systems that had their names changed in Goose.
• Still retaining compatibility with Pixie and Goose, since the assets.muxzip file is included. This might become a deprecated way to include grid icons in the future.

Update (2025-12-03)

• Fixed schemes to work with Loose Goose

Update (2026-03-11)

• Added optional TurbGrafx-16 and TurboGrafx CD icons

Minimal Round Large Grid [PIXIE]

Minimal Round Large Grid

This is an alternative version of Minimal Round Grid theme, with bigger icons for grid mode views in Explore and Applications. This comes at a cost of smaller grid size (3x3 for 720x720 displays and 2x3 for others).

As with previous themes, it comes included with Polish version and files for every supported resolution in every variant.

NOTE: This theme was updated to work with muOS Pixie Patch-1 (7c4e6a8), which means you don't have to install icons separately if you're on that version!

Installation

• Download .muxthm file with selected color variant and put it either in ARCHIVE or /MUOS/theme directory (you'd have to install the theme using Archive Manager if you put it in the ARCHIVE directory)
  Steps below only apply if you're NOT running muOS Pixie Patch-1 or above:
  • Download matching icon pack (with .muxzip extension) and put it in the ARCHIVE directory. NOTE: Dark Cherry variant uses icons for Night variant, so download those if you want to use Dark Cherry.
  • Install icon package using the archive manager.
• Enable it in Customisation -> muOS Themes
• Enjoy!

Screenshots

Minimal Round Grid [PIXIE]

Minimal Round Grid

This is the updated and revamped version of the popular Minimal Round Grid theme for muOS Pixie. It won't work with older versions of muOS!
It comes with grid mode support (now also for apps!) by default, so you'll have to install icon package alongside the color variant of your choice.

As with previous themes, it comes included with Polish version and files for every supported resolution in every variant.

NOTE: This theme was updated to work with muOS Pixie Patch-1 (7c4e6a8), which means you don't have to install icons separately if you're on that version!

Installation

• Download .muxthm file with selected color variant and put it either in ARCHIVE or /MUOS/theme directory (you'd have to install the theme using Archive Manager if you put it in the ARCHIVE directory)
  Steps below only apply if you're NOT running muOS Pixie Patch-1 or above:
  • Download matching icon pack (with .muxzip extension) and put it in the ARCHIVE directory. NOTE: Dark Cherry variant uses icons for Night variant, so download those if you want to use Dark Cherry.
  • Install icon package using the archive manager.
• Enable it in Customisation -> muOS Themes
• Enjoy!

Changelog

• changed font to DM Sans and included a converted version to use in the system alongside this theme
• added custom navigation glyphs to match the general feel of the theme more closely
• main menu now includes navigation glyphs to make it consistent with the rest of the screens
• added support for grid mode in Applications menu
• grid mode icons now use the same reversed gradient effect as main menu items when focused
• fixed an issue where selected item border would cause minor artifacts
• added more color variants!

Variants

• Minimal Round Grid
  
  
  
• Minimal Round Grid Amethyst
  
  
  
• Minimal Round Grid Cherry
  
  
  
• Minimal Round Grid Dark Cherry
  
  
  
• Minimal Round Grid Emerald
  
  
  
• Minimal Round Grid Lime
  
  
  
• Minimal Round Grid Metal
  
  
  
• Minimal Round Grid Night
  
  
  
• Minimal Round Grid Ocean
  
  
  
• Minimal Round Grid Summer
  
  
  

Minimal Round Grid Dark Cherry

This is another variant of Minimal Round Grid - it's the Cherry version with buttons from Night - perfect match for the red RG35XXSP!

Also includes the alternative version that supports grid mode.

To make the alternative version work correctly, install an icon pack from the Night version via the Archive Manager: https://github.com/TheWalruzz/muos-react-theme-toolkit/releases/download/theme-1.2a/MinimalRoundGridNight-icons.zip

Hexaneon Glitch - Slow Edition

Since some people might find the original Hexaneon Glitch a little bit too much when it comes to the frequency of glitches in the background, here is the slower version.

However, you have to pick appropriate version for your device this time, since animation frames are big and there's a lot of them!

Hexaneon Glitch

Hexaneon Glitch

A new variant of the Hexaneon theme, this time with a cyberpunk-themed background that uses animated glitches.

WARNING: Since it supports all the resolutions and there's a lot of animation frames, this theme is HUGE in file size (170 MB).

Minimal Round Grid Cherry

Minimal Round Grid Cherry

Added a new variant of Minimal Round Grid - the red Cherry version!
As previously, it's available in the basic version and an alternative one with grid mode support

If you want to install the alternative version, download the icons zip below and install it using the Archive Manager. Then install the theme as usual.

Hexaneon theme

A hexagon-based theme with a cyberpunk aesthetic.