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MustardOS

Free#22 of 25 in Emulation Frontends

MustardOS: A capable free frontend for supported Anbernic and TrimUI handhelds. Ranked #22 of 25 in Emulation Frontends by our editors (7.1/10); pricing: Free plan; best for supported Anbernic and TrimUI devices.

7.1/10Editor score

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At a glance

Editor score
7.1 / 10
Pricing
Free plan
Best for
Supported Anbernic and TrimUI devices
Free plan
Yes
Paid from
Free
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
Facts checked
22 Sep 2026

Where it wins
- Bundled RetroArch, PPSSPP, ScummVM, and emulator cores
- Browses SD1, SD2, and USB storage with collections and history
- Includes PortMaster, backups, hotkeys, themes, and device settings
Where it doesn't
- Support is limited to specified Anbernic and TrimUI models
- Does not include game-content scraping
- Requires SD-card image installation and updates

Our verdict on MustardOS

MustardOS, also called muOS, is open-source custom firmware with a configurable, themeable frontend for selected retro handhelds. It is aimed at owners of supported Anbernic and TrimUI devices who want game browsing, emulator launching, controller navigation, and device controls in one portable interface. The supported hardware includes specified RG28XX, RG34XX, RG35XX, RG40XX, RGCUBEXX, TrimUI Brick, and TrimUI Smart Pro models.

Its main strength is breadth within the handheld frontend category. MustardOS can browse game content across SD1, SD2, and USB storage, organize collections, show recently played history, and launch bundled emulator cores and applications including RetroArch, PPSSPP, and ScummVM. PortMaster support adds compatible ports, while device configuration covers connectivity, power, storage, overlays, and interface behavior. Controller hotkeys support navigation, save states, screenshots, and system actions, and backup and restore archives help manage device data.

Installation centers on SD-card images for supported hardware, followed by updates distributed for those devices. That approach suits owners comfortable managing handheld firmware and storage, but the product's value depends on matching the supported model list before installation. MustardOS is a strong pick for users who want a free, open-source frontend with bundled emulators, storage browsing, collections, backups, and device configuration. It is less suitable for owners of unsupported handhelds or anyone who specifically needs built-in scraping. Users seeking a narrow, model-agnostic frontend should consider an alternative with broader hardware coverage.

Your product? Our editors can test MustardOS in depth and publish a review, labelled as paid · from $149/mo →

MustardOS pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on muos.dev

MustardOS fact sheet

Free plan	Yes
Paid from	Free
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
Library import	Not verified
Metadata scraping	Not verified
Controller navigation	Yes
Portable mode	Yes
Cloud sync	Not verified
Deployment	Self-hosted
Support	Community, Docs
Built for	Solo, Small business (editorial estimate)
Pricing	Free plan
Website	muos.dev
Facts checked	22 Sep 2026

Alternatives to MustardOS

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Featured on iTechGuides

MustardOS is listed in our Emulation Frontends directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update