The Future of
Creation
Build anything at the speed of thought. 100% Rust.
Zero compromises.
Windows
macOS
Linux
iOS
Android
Web
Quest
OpenXR
PSVR2One Engine. Every Angle.
Games, simulation, data, and the internals: same engine, same cards, one panel.
Photoreal Rendering
Bevy's PBR pipeline. Real-time lighting, shadows, atmosphere, reflections. Worlds that look shipped, not prototyped.
Massive Open Worlds
Procedural terrain and seamless streaming. Walk for hours and never hit a loading screen.
Real-Time Multiplayer
QUIC networking, server-authoritative, low latency. Built in, not bolted on.
VR and XR Native
OpenXR out of the box. Quest, PSVR2, and desktop XR from one project.
Physics and Destruction
Avian physics with soft bodies, ragdolls, and things that break the way they should.
Ship Anywhere
One project, every screen. Windows, Mac, Linux, mobile, web, and headset.
Spatial Audio
Sound that lives in the world, not just the speakers. 3D positional audio, occlusion, and reverb that track the geometry.
Particles and VFX
Fire, smoke, sparks, and spells. GPU particle systems that hold their frame rate when the screen gets loud.
How We Compare
Honest, category by category. We do not win every row. We will show you the ones we lose.
Simulation Software Comparison
| Capability |  Eustress |  Omniverse |  AnyLogic |  MATLAB |
|---|---|---|---|---|
| Real-time 3D world | ✓ 60+ FPS | ✓ RTX | ~ Basic 3D | ✗ Plots only |
| Scale (entities) | ✓ 10M+ | ✓ Large (USD) | ~ 100Ks agents | ~ Matrix-bound |
| Time compression | ✓ ~1 yr/sec | ~ Limited | ✓ Discrete-event | ✓ Numerical |
| Agent-based modeling | ✓ ECS-native | ~ Via Kit | ✓ Specialty | ~ Toolbox |
| Numerical / control libs | ~ Growing | ~ Partial | ~ Partial | ✓ Gold standard |
| Photoreal rendering | ~ PBR | ✓ RTX path-traced | ✗ None | ✗ None |
| AI-native control | ✓ MCP bridge | ~ Kit/USD | ✗ None | ~ Scripted |
| Source open / forkable | ✓ PolyForm Shield | ✗ Proprietary | ✗ Commercial | ✗ Commercial |
| Pricing | ✓ Free, no royalty | ~ Free indie, paid ent. | ✗ $$$ license | ✗ $$$ per seat |
Game Engine Comparison
| Feature | Eustress |  Roblox |  Unity |  Unreal |
|---|---|---|---|---|
| Performance | ✓ Native Rust | ~ Lua VM | ~ C# + Mono | ✓ C++ |
| Memory Safety | ✓ Guaranteed | ✓ Sandboxed | ~ GC Pauses | ✗ Manual |
| Max Instances | ✓ 10M+ | ~ 100K | ~ 500K | ✓ 1M+ |
| Web Export | ✓ Native WASM | ✗ None | ~ WebGL | ✗ Limited |
| Source open / forkable | ✓ PolyForm Shield | ✗ Closed | ✗ Closed | ~ Source access |
| Pricing | ✓ Free, no royalty | ~ Revenue share | ✗ Per seat | ~ 5% royalty |
| Scripting | ✓ Soul + Rune + Luau | ✓ Luau | ✓ C# | ✓ Blueprint + C++ |
| Studio Editor | ~ Maturing | ✓ Polished | ✓ Polished | ✓ AAA |
Best for fidelity
Game-grade 3D meets real physics and real data. The simulation does not cheat, and it still runs at interactive FPS.
Best for ownership
PolyForm Shield means no platform tax, no royalty, and a roadmap you control. Fork it, ship it, keep the work. The one limit is reselling the engine itself.
Best for AI-native work
Drive the live engine over MCP. An agent can build a scene, run a year of consequences, and read back the result.
What Eustress Simulates
Real models running in the engine today
V-Cell Battery
Anode-free lithium-sulfur, 569 bipolar layers in one can: 1,223 V and 1,032 Wh/kg, aged 699 cycles in seconds
Fusion Exosuit
ENERGYClimate Model
DATASupply-Chain Twin
EPCIS / GS1Fission Reactor
PID CONTROLDon't Take Our Word For It
Read the code
Source-available, top to bottom. The clock, the physics, the data layer, all of it readable under PolyForm Shield. If a claim on this page matters to you, go read the source.
Built in Rust
Memory safety is structural, not aspirational. The bug that eats other teams' weeks does not compile here.
Runs today
Not a render. Thousands of entities, interactive frame rates, click-select and raycast. A real engine you can launch right now.
Build It With Us
The best simulation engine should not be a walled garden. It should be free.
Eustress ships under PolyForm Shield: free to clone, fork, and build on. The work you put in is the equity you keep.
Ready to Model the Real World?
Join the builders simulating reality, and owning every bit of it.
Start Free Today