| OpenSim | Unity3D | High Fidelity | VFW Sandbox | Godot | |
|---|---|---|---|---|---|
| Website | http://opensimulator.org/ | http://unity3d.com/unity | https://highfidelity.io/ | https://www.adlnet.gov/adl-research/virtual-reality-games-simulations/virtual-world-sandbox/ | http://opensimulator.org/ |
| Free | Yes | Yes No pro needed | Yes $20/yr custom URL | Yes | Yes |
| Multiplatform | Yes | Yes | Yes | Yes Chrome browser | Yes |
| Physics engine | Yes | Yes | Yes | Yes | Yes |
| Sound and music | Yes | Yes | Yes | Yes | Yes |
| Persistent worlds | Yes | Yes Possible | Yes | Yes Edit-time | Yes Possible |
| Data logging | Yes | Yes Possible | Yes | Yes | Yes Possible |
| Object manipulation at runtime | Yes | Yes Possible | Yes | Yes | Yes |
| Animated gestures | Yes | Yes Possible | Yes | Yes Possible | Yes Possible |
| Collaborative Editing | Yes | Yes Possible | Yes | Yes Edit-time | Yes Possible |
| Chat and IM | Yes | Yes Possible | Yes | Yes | Yes ENET IPv4 |
| Server-client networking | Yes | Yes | Yes | Yes | Yes ENET IPv4 |
| Opt-out content rights | Yes | Yes Possible | Yes | Yes | Yes Possible |
| Friends lists | Yes | Yes Possible | Yes | - Possible | Yes Possible |
| Texture upload at runtime | Yes | Yes Possible | Yes | - Edit-time | - Possible |
| 3D model upload at runtime | Yes | Yes Possible | Yes | - Edit-time | - GDScript or ASSIMP |
| HTML4 on an object | Yes | Yes Possible | Yes | - GUI only | No C++ module |
| Voice Chat / VoIP | Yes | Yes Possible | Yes | No Broken | No C++ module |
| e-Commerce | Yes Setup challenges | Yes Possible | Yes | No | No |
| Appearance customization | Yes | Yes Possible | - Mixamo | - Upload mesh | - Upload mesh |
| Heightmap terrain | Yes | Yes | No | Yes | Yes |
| Runs on low spec devices | Yes Lag | Yes Possible | No Black screen | - Sluggish | Yes |
| Used by a large community | Yes Relatively | Yes | No Very Small | No Very Small | - Small |
| Imports OAR files | Yes | Yes With free plugin | No | No | No |
| Commercial use | Yes | - Pro (if >$100k) | Yes | Yes | Yes |
| Low Monthly costs | Yes Self-host | - Plugin determined | - Domain URLs | Yes Self-host | Yes Self-host |
| Complex 3D shape editing | Yes Hollow/taper/twist | - Plugins or code | - From code | Yes Extrude/taper/twist | No GDScript or C++ |
| Imports IAR files | Yes | - Via OAR no scripts | No | No | No |
| Open source | Yes | No Proprietary | Yes | Yes | Yes |
| Tutorials and documentation | 1.0 1 rating | 5.0 1 rating | 2.0 1 rating | 2.0 1 rating | 3.0 1 rating |
| Vehicles and alternate control | 2.0 1 rating | 5.0 1 rating | 3.0 1 rating | 3.0 1 rating | 3.0 1 rating |
| User Interface scripting | 1.0 1 rating | 5.0 1 rating | 3.0 1 rating | 3.0 1 rating | 5.0 1 rating |
| Backups | - Console/scripts | Yes Possible | Yes Built-in | Yes | Yes Possible |
| Scriptable characters | - MockingBOT | Yes | Yes | Yes | Yes |
| Combat and interaction | - Limited | Yes Possible | Yes Possible | Yes Possible | Yes Possible |
| Scalability | - Bloating | Yes Possible | Yes | - Asset server | - Possible |
| Scripting at runtime | - LSL | Yes Possible | Yes | - Edit-time | - C++ module |
| Existing VR support | - Experimental | Yes | Yes | - Rendering | - GDScript or C++ |
| Animated 3D models | - Avatar only | Yes | - Avatar only? | - WebGL format only | Yes |
| Command-line and APIs | - Console only | Yes Possible | - JavaScript only | - JavaScript only | Yes Possible |
| Shared content library | - Not by default | Yes Possible | No | - Possible | Yes Possible |
| Large region sizes | - Varregions | Yes Possible | No Not mentioned | - Performance | Yes Possible |
| Used by large companies | - Education | Yes All kinds | No Alpha | No Research Alpha | - Indie Devs |
| Content marketplace | - SecondLife | Yes Asset Store | No | No | No |
| HTTPS and Cookies | No | Yes | Yes | Yes | Yes |
| Stereoscopic 3D | No | Yes | Yes | Yes | Yes Possible |
| HTML5 on an object | No | Yes Possible | Yes | - GUI only | No C++ module |
| Skeletal tracking | No | Yes Possible | Yes | No | No C++ module |
| Hand tracking | No | Yes | Yes | No | No C++ module |
| Mobile support | No | Yes Native | No | Yes HTML5 | Yes Native |
| Pathfinding and AI | No Not implemented | Yes | - JavaScript | - JavaScript | Yes Possible |
| Augmented Reality (AR) | No | Yes ARToolkit SDK | - Potentially | - JavaScript | - C++ module |
| Peer-to-peer networking | No | Yes Possible | - Partial | No | No C++ module |
| Cameras | No | Yes | - Partial | Yes | Yes |
| Render-to-texture | No | Yes | No | Yes | Yes |
| HTML5 Client | No | Yes WebGL | No Unknown | Yes Chrome browser | No Broken |
| Garbage collection | No | Yes Possible | No Not mentioned | - VFW framework | Yes Possible |
| Opt-in content rights | No | Yes Possible | No | - Possible | Yes Possible |
| Future migration options | No | Yes | No | - HTML5 | Yes |
| Game console support | No | Yes | No | - HTML5 + WebGL | No Not public |
| Minimal network data | No Constant | Yes Possible | No Constant | No Constant | Yes Possible |
| Animate at runtime | No Upload BVG | Yes Possible | No Upload FBX | No Edit-time | - Possible |
| Soft body physics | No | Yes Possible | No | No | No |
| Physcally based rendering | No | - Needs pro | Yes | No | No Future version |