SteamOS became an Android app: DroidDeck hit 18k stars in 43 days, riding a piece Valve released and a ten-day head start

In 2026 September, Valve released an ARM64 Linux Steam client alongside the Steam Frame. A group of developers who were already running PC games on Android packed it into a root-free APK within about ten days and named it DroidDeck. 43 days later it had 18,059 stars and roughly 1.29M APK downloads, and dozens of gaming tech channels had made videos about it on their own. The story is easy to understand but hard to copy. Below: what they got right, where the stars came from, and which gaps are still open.

2,531 likes on a single video comment

On Oct 3, the handheld review channel Retro Game Corps posted a 21-minute video titled "SteamOS is Now an Android App". It shows a Retroid Pocket 6 and an AYN Odin 2 Portal opening Steam Big Picture, logging in, downloading, and launching games, exactly like a Steam Deck. As of 11-06 the video has 1.34M views and 1,531 comments (YouTube, 11-06).

The most-liked comment says: "Finally a way to play Hades on my 32 Android handhelds." It has 2,531 likes. Further down are other reactions: "Valve should just make an official one" (1,604 likes) and "The Android emulation scene is about to blow up again over Valve's FEX." One comment with 482 likes reads: "GameNative just announced less than a week ago on Discord that it will show ads when launching games." (GameNative is the most popular open-source option in this space, and r/GameNative has a thread complaining about loading-screen ads.)

A week later, on Oct 10, ETA PRIME posted "SteamOS on Your Phone Is Finally Here!", demonstrating a Red Magic 11 Pro running Cyberpunk 2077 through Proton at medium settings at 60 fps, with 1.48M views. The second comment came from the DroidDeck developers themselves: "Thanks for covering DroidDeck!"

What it actually is

An Android app. Once installed, it sets up a small Linux system inside the app's private storage (using proot, so no root and no flashing), and inside it runs Valve's own ARM64 Steam client and ARM64 Proton. The x86 game code is handed to FEX for translation, and the picture is sent to the phone screen by a compositor the team wrote. It opens into SteamOS Game Mode: Big Picture, the quick menu, cloud saves, achievements, and friends, all running on Valve's own code. You can also switch to a full Linux desktop, connect GOG, Epic, and Xbox, and install Decky plugins.

The requirements are also in the README: Android 9 or later with a Snapdragon GPU using Adreno 730 or later (MediaTek Mali and Samsung Xclipse are not supported), and about 4 GB of free space to start. On Android 14 and later, you need to enable "disable child process restrictions" in Developer Options. Licensed GPL-3.0, and the first line of the README in bold reads: "100% open source. No ads. No telemetry."

Others got there first

Playing PC games on Android isn't new, and several major projects already cover the space:

The difference fits in one sentence: the others "simulate a Windows and then imitate Steam", while DroidDeck "runs Valve's actual Steam and lets Valve's own Proton do the work". One of the team members, The412Banner, put it plainly in an explainer in late September: the old path means you fix every Windows-side issue yourself; the new path means Valve ships a better ARM Proton and Steam downloads updates itself, "just like on the Deck".

Why now

Valve supplied the key piece. Steam Frame shipped in Sep 14, running on Snapdragon chips, and along with it came a usable ARM64 Linux Steam client and a Proton build with Arm64 support. Back in late August, someone had already blogged that running the full Steam client on an Android tablet without root was possible but fragile. DroidDeck was the first to turn that into an app an ordinary person could use with one tap, and it created its repo in Sep 24.

They could move this fast because they weren't starting from scratch. The three main contributors, xXJSONDeruloXx (878 commits, with nearly all public repos about SteamOS and Proton), The412Banner (429 commits), and maxjivi05 (331 commits), had already been building Bannerlator and WinNative, so controller input, drivers, and runtimes were ready to use (GitHub, 11-06). The only thing they lacked was Valve's client.

Two more pushes. One is that Valve said in Oct 5 that ARM Linux Steam is "not officially supported," and the media ran with it again (TechPowerUp, 10-06). The other is what the comment above mentioned: GameNative just announced ads, so some users are looking to switch (inference: comments back this up, but it can't be quantified).

Where the stars came from

Almost all of it came from YouTube gaming-tech and handheld channels that covered it on their own. Hacker News has nothing on it, and X barely mentioned it in 45 days.

The top 30 DroidDeck videos by views total about 10M views (YouTube, 11-06), and four of them hit the million mark: ETA PRIME 1.48M, Retro Game Corps 1.34M, Water CS2 1.21M, Cyber Dopamine 1.07M. The earliest big video was from the Spanish channel 3BTech, Sep 27,540k. Then came a Korean wave: SEOULiAN 900k, titled "Galaxy S26 Ultra users suddenly get a Steam Deck for free"; Tech-Pick 530k, "Fold8 is a Steam Deck." Brazilian, Russian, Indonesian, Hong Kong and Taiwanese tutorials followed. The highest TikTok video has 546k views. Android Authority ran a feature in Oct 6.

The star curve lines up with the videos:

No sign of paid promotion. The project charges nothing, so there's no reason to buy acquisition; the video titles all carry a "This is a HUGE deal" tone (inference: organic spread, not directly verified).

The other thing that kept it supplied with new material is cadence. 0.2.0 (9-28), 0.3.0 (10-02), 0.4.0 (10-12), 0.5.0 (10-18), 0.6.0 (10-22), 0.6.9 (10-31): roughly one major release a week, with 43 commits over 2,000 days. Every major release gives creators a reason to film another "It just got a BIG update" video.

Where it falls short

• Snapdragon only: Mali, Xclipse and PowerVR aren't supported. Lots of MediaTek and Exynos phones worldwide can't use it.
• Heavy: Android Authority measured one small game taking 12 GB; first-time setup means flipping switches in Developer Options, and plenty of people get stuck there.
• Compatibility and performance still trail GameNative, with 458 open issues.
• Growth is slowing: daily gains fell from a peak of 1,508 to about 200, a drop of roughly 85%.
• The foundation belongs to someone else: Valve has said "not officially supported." If Valve restricts logins on unofficial devices, or ships its own official Android version (the most-requested thing in the comments), the project's meaning changes. 11-04 It also put out a "for Google Play upload" build, but the team wrote in September that to run programs they had to pin targetSdk at 28, "so it can never be on Play." Whether it passes review is unknown.

People are already working the gaps: MaliBridge was created in Oct 13 to bring the same experience to Mali GPUs, reached 254 stars by 11-06, and gained 100 over the last 7 days. Others are riding the name: the README says "DroidDeck has no website," yet droiddeck.app runs an official-sounding landing page and comparison blog that ranks first in search.

If it were you

C. There's a lot to learn here, but building "SteamOS on Android" now isn't worth it. The first-mover advantage, the low-level know-how and the whole ring of YouTube channels already belong to this group.

Who it fits: developers already working on Wine / Box64 / FEX / Turnip and Android graphics drivers; people with a non-Snapdragon device who are willing to wrestle with GPU driver compatibility.

Who it doesn't fit: anyone who wants to build a similar app and win stars with it. The same video creators won't film a "second DroidDeck" again, especially when the original team ships a major release every week.

How to build: don't go head-to-head with it. Go after the parts it explicitly says it doesn't support. The clearest is non-Snapdragon GPUs (Mali / Xclipse). MaliBridge is already doing it and hit 254 stars in three weeks, which shows demand, but the difficulty is all in the drivers. The second is building add-ons for DroidDeck: a device compatibility database, one-click setup, storage slimming, game config sharing. These can ride its traffic. You won't get many stars, but its community will see you quickly. The more transferable lesson is the method itself: when a big company ships a new capability (a new ARM client, a new model runtime, a new system interface), package it into something an ordinary person can use with one tap within ten days, and position it with a line like "XX became an App."

How to get users: follow its playbook. YouTube handheld and gaming-tech channels (Retro Game Corps, ETA PRIME and the like) are the main front, followed by r/SBCGaming, r/Android and the Korean and Spanish channels. Make a demo GIF that's understandable in ten seconds, ship a visible new version every week, and open a Discord to collect device reports.

When to move: get the first batch of videos on the Mali gap in the next month or two, before DroidDeck adds Mali support itself or Valve ships an official solution.

What would show I'm wrong: ① DroidDeck's daily gains climb back above 500 in November with a new release, meaning the category is still expanding and there's more room to follow than I estimated; ② MaliBridge passes 2,000 stars within a month, showing that "filling in the devices it doesn't support" can stand on its own, and this one should be upgraded; ③ the reverse: Valve ships an official Android Steam, or blocks unofficial device logins, and this whole category cools off together.

A closing note for everyone building open source: DroidDeck's core technology belongs to others. Steam and Proton are Valve's, FEX and Turnip are community projects. This group did the last mile: the compositor, no-root setup, controller support, automatic driver selection. Stars often go not to whoever wrote the most code, but to whoever first got it into ordinary people's hands.