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PhysBox Pro — One Account, Every Surface

The simulators stay free.
Pro levels up your workflow.

A single PhysBox account gives you cloud saves across Volt, Mesh, Etch and Flux, cross-device monitoring of fabrication jobs while they run, and PhysBox Native — the GPU-accelerated C++20 desktop build of Mesh for Linux and Windows.

Get the Native App What's Included
Linux · Windows · Sign in to download
What Pro Adds

Three things a browser tab cannot do on its own

Everything PhysBox simulates stays open-source and free in the browser. Pro is the account layer around it: your scenes follow you, your machines report back, and your workstation's GPU gets used properly.

01

Cloud Saves

Scenes, netlists, toolpaths and parameter sets are stored against your account rather than the browser profile that happened to make them. Sign in on another machine and the same presets are already in the list — no export step, no ~/Downloads full of near-identical JSON, no losing a lab's worth of tuning to a cleared site-data prompt.

  • Presets and parameters sync across Volt, Mesh, Etch and Flux under one account.
  • Saves are keyed per app, so a Mesh scene and an Etch job never collide.
  • Local work keeps working offline — the cloud copy reconciles when you sign back in.
  • The same library is visible to the native desktop app.
Your preset library
double_pendulum_chaos.scene
Mesh · synced from workstation
Synced
buck_converter_rev4.netlist
Volt · synced from laptop
Synced
enclosure_fingerjoint.svg
Etch · synced from shop tablet
Synced
Live machine telemetry
Laser — enclosure_panels
line 4,118 / 9,204 · F1200
Running
CNC router — jig_plate
X 182.40   Y 96.15   Z -2.00
Running
Printer — pendulum_bob
completed 11 min ago
Idle
02

Cross-Device Job Monitoring

The machine in the workshop is driven over WebSerial by whatever browser or desktop app is plugged into it — but with Pro that session also posts telemetry to your account. Progress, position, feed rate, spindle speed and errors are readable from any other device you are signed in on, so you can leave a four-hour engrave running and check it from your phone rather than the stool next to it.

  • Live status, line progress and XYZ position from laser, CNC and 3D print jobs.
  • Several machines at once, each reporting under its own device and app id.
  • Faults surface as the machine reports them, not when you next walk past.
  • Read-only by design — monitoring never takes control of a running job.
03

PhysBox Native

The desktop build of Mesh: a C++20 application running MuJoCo natively against a Dear ImGui interface, with a GPU-accelerated 3D viewport. It is a reimplementation rather than a wrapper — no browser, no WebAssembly, no 4GB heap ceiling — and it shares its data with the web app, so a scene compiled here is byte-for-byte the scene the web app compiles.

  • Native GPU-accelerated viewport — the renderer talks to the driver directly, not through a browser's compositor.
  • 4x multisampled anti-aliasing — the 3D view resolves out of an MSAA buffer, so edges stay clean in both light and dark themes.
  • Everything the Mesh web app does — the CSG/OpenSCAD geometry pipeline, the MJCF compiler, node scripts, aerodynamics, print volumetrics and STL export are all ported term-for-term.
  • The AI copilot in Explain, Generate and Mutate modes, running on the same system prompt as the web app.
  • Native file access and undo — open and save straight from disk; a generated scene rolls back in one Ctrl+Z.
PhysBox Native desktop app showing a double pendulum scene in the 3D viewport with the tool palette and inspector panels
PhysBox Native on the desktop: tool palette, GPU-accelerated 3D viewport and the inspector's print volumetrics, all in one C++20 process.
Free vs Pro

What changes when you sign in

The simulation engines are identical. Pro adds persistence, telemetry and the native desktop build.

Capability Free (browser) PhysBox Pro
Volt, Mesh, Etch & Flux simulators Full engines Full engines
MCP tooling & AI copilot Included Included
Saving scenes & presets Local browser storage only Cloud saves, synced across devices
Monitoring a running machine Only on the device that is driving it From any signed-in device
PhysBox Native desktop app Not available Linux & Windows download
Rendering WebGL in a browser tab Native GPU viewport with 4x MSAA
Model size ceiling Capped by the 4GB WASM heap Bounded by your machine's RAM
Download PhysBox Native Sign In

PhysBox Pro is in Early Access. Signing in with Google registers your account — the download page lists the builds available to you.