KNULLI

Linux · Self-hosted

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Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

KNULLI is ranked #10 of 25 in emulation frontends on Freedom251. It runs on Linux, Self-hosted. There is a free plan.

KNULLI plans and pricing

All plans

KNULLI Free Custom firmware for supported retro-gaming devices knulli.org · 30 Sept 2026

Compared on emulation frontends

Supported platforms: Anbernic RG series, GoRetroid Pocket 5/Mini, Miyoo Flip, Powkiddy RGB30/X55, Orange Pi Zero 2w, TrimUI Brick/Smart Pro
Emulators included: Yes
Library import: Yes
Metadata scraping: Yes
Controller navigation: Yes
Portable mode: Yes
Cloud sync: No

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The record

Purpose: KNULLI is custom firmware for retro-gaming devices such as handhelds and bartops, developed as a fork of Batocera.
Audience: The project focuses on devices with unavailable or outdated kernel sources, limited GPU support, or devices its team chooses to support.
Emulation: KNULLI includes EmulationStation or Simplemenu/Simplermenu+ frontends, RetroArch, and multiple libretro cores.
Wireless: It supports wireless and Bluetooth, including audio, when the device supports them, and can use external USB wireless adapters.
Gaming features: Features include RetroAchievements, netplay, and cover art and thumbnail scraping.
Metadata sources: The built-in scraper can fetch metadata and media from ScreenScraper, TheGamesDB, and ArcadeDB.
Save synchronization: Syncthing is pre-installed and can synchronize savegames across KNULLI devices or back them up to a NAS; it does not use a cloud.
File sharing: KNULLI makes userdata available over SMB for wireless file transfers on a local network.
Installation: Installation requires downloading a device-specific image and flashing it to an SD card or the device's internal storage.
Device support limit: If a device is not listed among the installation package downloads, the site says there is no public release for it and warns against using another device's package.
Library requirement: Games, BIOS files, saves, and themes must follow KNULLI's strict, case-sensitive folder structure.
Security: The site warns that KNULLI devices have no root password by default, making device data accessible on the local network, and recommends enabling additional security.
Licensing: KNULLI combines open-source components under their respective licenses and includes some components licensed for non-commercial use only.
Support: The project uses Discord for discussions and provides a wiki with setup and troubleshooting guides.
Price from: Free

Where it ranks on Freedom251

Best Emulation Frontends in 2026#10 of 25

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Sources

knulli.org· checked 30 Sept 2026
knulli.org/about-knulli/· checked 30 Sept 2026
knulli.org/configure/syncthing/· checked 30 Sept 2026
knulli.org/play/install/· checked 30 Sept 2026
knulli.org/configure/networking/· checked 30 Sept 2026