CSP Mux

Clip Studio Paint allows one Companion Mode connection. CSP Mux holds that one connection and re-shares it, so several tools can use CSP at the same time. Pair once instead of re-pairing every time you switch tools.

Use it

1. In CSP: File > Connect to smartphone (Datei > Mit Smartphone verbinden). Keep the real QR on screen.
2. Open the Mux. Under Settings > Connection scope pick This computer only or a private IPv4 address.
3. Select Scan CSP QR, wait for the proxy QR.
4. Point every Companion app at the proxy QR, never at CSP's.

Connect to smartphone is a toggle with a checkmark, not a dialog. Selecting it while it is on turns Companion Mode off.

The client pill counts attached apps. Hide QR blanks the code without dropping CSP or any connected app.

Pages

• Installation — downloads, .NET 8 runtime, antivirus
• How It Works — one upstream, many downstream sessions
• Connection Scope — loopback vs LAN, security posture
• Palette Companion Integration — auto-connect handoff
• Build from source — SDK, publish flags, CI

Window 460 x 620. Lives in the tray; the close button hides it, Exit is in the tray menu. Settings live in %LOCALAPPDATA%\CSP App Multiplexer\settings.json.

Proof of concept: no upstream reconnection, no rate limits, no permission model for dangerous commands. GPL-3.0.