MustardOS

Name: MustardOS
Price: 6 USD

Self-hosted · paid plans from $6/mo

Visit site Alternatives

Freedom report

No signalScore 5.1

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedThinly documented

MustardOS is ranked #18 of 25 in emulation frontends on Freedom251. It runs on Self-hosted. Paid plans start at $6/mo.

MustardOS plans and pricing

All plans

Artificer $6/mo $6 per month testing crew preview access · weekly testing updates · special Discord access muos.dev · 7 Oct 2026

Knight $9/mo $9 per month exclusive testing group · weekly testing updates · name on credits screen · special Discord access muos.dev · 7 Oct 2026

Hero $12/mo $12 per month nightly development exclusives · name on credits screen · special Discord access · behind the scenes muos.dev · 7 Oct 2026

Compared on emulation frontends

Free plan: Yes
Supported platforms: Anbernic RG28XX H, RG34XX H, RG34XX SP, RG35XX 2024, RG35XX H, RG35XX PLUS, RG35XX PRO, RG35XX SP, RG40XX H, RG40XX V, RGCUBEXX; TrimUI Brick and Smart Pro
Emulators included: Yes
Controller navigation: Yes
Portable mode: Yes

Best MustardOS alternatives

See all 20

Two bars RetroArch Free tier No. 1Free6.8 Two bars ES-DE Frontend Free tier No. 2Free6.6 Two bars Lakka Free tier No. 3Free6.6 Two bars Pegasus Frontend Free tier No. 4Free6.6 Two bars RetroHub Free tier No. 5Free6.6 Two bars Attract-Mode Free tier No. 6Free6.5

The record

Product: MustardOS (muOS) is custom firmware primarily for handheld devices.
Personalization: The firmware is configurable and themeable, with options to customize its look, style, and behavior.
Installation: Installation uses an image flashing tool to write MustardOS to an SD card, which is then inserted into the handheld.
Audience: MustardOS says it is designed for both people new to handhelds and experienced enthusiasts.
Device support: The supported-device page lists handhelds from Anbernic and TrimUI, including RG35XX and TrimUI Smart Pro models.
Emulation: The documentation lists supported systems and cores including RetroArch and ScummVM.
File access: The built-in Filebrowser can be accessed through a browser on the same local network after enabling SFTP + Filebrowser.
Default credentials: The Filebrowser guide gives the default username and password as muos and muos.
Sync and backup: The Syncthing guide describes syncing the MustardOS save folder to a PC as a backup method.
Storage caveat: The Syncthing guide says its Watch for Changes option works only on FAT32 partitions and should be disabled for exFAT.
Support: The site points users to its Discord and community forum for assistance.
Funding: The project accepts one-off donations and subscriptions to support software, hardware, and development accessories.
Project origin: The site describes MustardOS as having begun as a small personal hobby project that grew into a community project.
Project team: The crew page identifies XongleBongle as the lead developer behind MustardOS.
Price from: $6/mo

Where it ranks on Freedom251

Best Emulation Frontends in 2026#18 of 25

Is MustardOS yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote MustardOS

Sources

muos.dev· checked 7 Oct 2026
muos.dev/devices· checked 7 Oct 2026
muos.dev/web/sftpfilebrowser· checked 7 Oct 2026
muos.dev/web/syncthing· checked 7 Oct 2026
muos.dev/docs/support· checked 7 Oct 2026
muos.dev/crew· checked 7 Oct 2026