iDeck: bringing real Steam Big Picture to an iPhone, one compatibility bug at a time

Description and use

iDeck enables running the Windows Steam client with Big Picture on an iPhone, yet game compatibility remains limited.

Problem

Running Valve’s Windows Steam client, including Big Picture, on an iPhone without a streaming PC.

Outcome

iDeck demonstrates that the Windows Steam client can run on an iPhone, enabling Big Picture UI and local game launch, but game compatibility and stability remain limited.

Workflow

• 1. Build iDeck using Madeira’s Wine/FEX/Metal runtime. 2. Install the Windows Steam client within the iDeck environment. 3. Sign in with Steam Guard and reuse saved login. 4. Browse the Big Picture library and launch a compatible PC game. 5. Observe gameplay on the iPhone screen.

Evidence

iDeck runs Valve's actual Windows Steam client, including Big Picture, through Madeira's Wine/FEX/Metal runtime.

Source

On an iPhone 15 Pro Max, genuine sign‑in/Steam Guard, saved‑login reuse, Big Picture library browsing and PC game startup have been observed; gameplay has also been reported by the tester.

Source

The public release is source‑only: no ready IPA, Valve client, games, credentials or signing profiles.

Source