ZyperOS vs ROCKNIX on the GKD Pixel 2
ROCKNIX is a Linux distribution for many retro handhelds, and it has run on the GKD Pixel 2 since its August 2026 release. ZyperOS is made for the Pixel 2 and builds on ROCKNIX's work: its kernel uses ROCKNIX's RK3326 patches and the Pixel 2's device tree. This is the two side by side, from each project's own code, docs and releases as of 7 November 2026.
On this page
The short answer
- Pick ROCKNIX if you want the most systems, DraStic and PortMaster ready on the card, or a USB Wi-Fi adapter with a newer chip.
- Pick ZyperOS if you want games that start the moment you press A, box art and video previews fetched on the handheld with no account, games sent from a phone's browser or over the USB cable, a card a Mac or PC can read, and battery care such as a charge limit.
Side by side
| ZyperOS | ROCKNIX | |
|---|---|---|
| License | GPL-3.0, free | GPL-2.0 for its own code |
| Latest for the Pixel 2 | v1.0.1 (November 2026) | 20261101 (November 2026) |
| Systems | 40, and Ports | 120 in its RK3326 list |
| Card a Mac or PC reads | exFAT | ext4 |
| Games over the network | Web page, Wi-Fi or USB cable | Web server, Samba, SFTP, USB |
| Box art on the device | libretro, ScreenScraper, SteamGridDB | ScreenScraper |
| Video previews | Yes | – |
| RetroAchievements | Yes | Yes |
| Nintendo DS | DSperate built in, DraStic if you add it | DraStic built in, melonDS and others |
| PortMaster | On the shelf | Included |
| System updates | Over Wi-Fi or the USB cable, with roll back | Over the air, or a file |
| Charge limit | 80, 85 or 90% | – |
| Charging screen when off | Yes | – |
| Side lights | Battery, volume, brightness, transfers, achievements | Battery level and charging |
| Rumble | Yes | Yes |
Installing
ROCKNIX publishes one image for a group of RK3326 handhelds; the Pixel 2's is the "b" image, ROCKNIX-RK3326.aarch64-20261101-b.img.gz. You decompress it and write it to a card, or on Windows use the ROCKNIX Image Burner, which lists the GKD Pixel 2. On the first boot it runs its install process and reboots.
ZyperOS's release has a card image you write with any image writer, and ZyperOS Installer, which downloads and writes it for you. The install guide covers both.
Adding games
This is the biggest practical difference. ROCKNIX expands the whole card as ext4, a Linux file system, and its docs say Windows cannot reach it; only Linux reads the card in a computer. Instead it offers many ways over the network: a simple web server, Samba, SFTP and scp, and over the Pixel 2's USB-C port a network mode or a file-transfer mode. Its FAQ notes that SSH and Samba are off by default in release builds.
ZyperOS formats its games space as exFAT, so the card opens on a Mac or PC. Over Wi-Fi or the USB cable it opens one web page in any browser, behind a PIN, with no app; with no network around, the handheld makes its own for your phone. The adding games guide shows it.
Box art and achievements
ROCKNIX's scraper is built in and uses ScreenScraper, which needs an account. ZyperOS asks libretro's collection with no account, ScreenScraper with one, and SteamGridDB with your key for homebrew and hacks, and it can turn a cover into a few seconds of video. Both sign in to RetroAchievements on the handheld. ZyperOS keeps a game's achievements on the card after its first start, so it works offline and sends unlocks later.
Nintendo DS and PortMaster
ROCKNIX's RK3326 builds include DraStic, the default for the DS in its RK3326 list, along with melonDS and others, and they include PortMaster. ZyperOS ships DSperate with three screen layouts and a d-pad stylus, and runs DraStic if you add it. ZyperOS installs PortMaster from its Ports shelf with one press, over Wi-Fi, from PortMaster's own releases, and PortMaster updates itself after that. See the DS guide and the PortMaster guide.
Wi-Fi adapters
The Pixel 2 has no Wi-Fi, so both need a USB adapter. ROCKNIX's RK3326 kernel builds many USB Wi-Fi drivers, Realtek's newer rtw88 and rtw89 among them, though it publishes no list of adapters tested on the Pixel 2. ZyperOS's kernel has fewer: the RTL8188EU family, tested with the TP-Link TL-WN725N, and the other chips the kernel's rtl8xxxu drives. The Wi-Fi guide has the details.
Battery
ROCKNIX's Pixel 2 settings turn on a battery script for its side lights: a red light at 10% or less, one to four green lights for the level, and a blinking light while charging. It powers the handheld off when the measured voltage stays at or under 3.4 V. ZyperOS's side lights show the battery too, plus volume, brightness, finished transfers and achievements, each on or off. It adds a charge limit, a charging screen while off, and a warning before heat slows a game. The battery guide shows them.
Updates
ROCKNIX updates over the air from its menu, or from a .tar file you copy over. ZyperOS's System Update downloads only what changed, into a second system slot, and goes back by itself if the new version fails to start. Without Wi-Fi, the File Transfer page brings it over the USB cable.
Which one to pick
ROCKNIX is the broader system: more systems, more handhelds and more ways to connect. ZyperOS is narrower and made for this one handheld, with the polish that allows: a first-start tutorial, a card your computer reads, transfers from a phone, covers and previews on the device, and care for the battery. If you can, try both: each one is a card, and the Pixel 2 starts whichever is in it.
Sources
- ROCKNIX distribution at 13d241a: README, RK3326 systems and cores, the Pixel 2 device tree, its Pixel 2 settings and battery script, the emulators package (DraStic, PortMaster), the RK3326 kernel config.
- ROCKNIX releases 20261101, 20261001 and 20260801.
- rocknix.org at 18a3599: Install, Adding games, FAQ, Scraper, RetroAchievements, Updates.
- ZyperOS: the README and the user guide.