Side by side
oPhysics vs turtleFSI
Both stand on physics simulation software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
oPhysics offers a broad browser simulation library for physics learning and practice. Its adjustable models, questions and graph tools support exploration, while the site’s ongoing development means coverage continues to evolve.
Visit oPhysics Free plan LinuxMacSelf-hosted
turtleFSI provides configurable, restartable simulations for research-oriented fluid-structure work. Its dependencies and possible solver memory failures should be considered before larger runs.
Visit turtleFSIThe facts
| oPhysics | turtleFSI | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | Linux, Mac, Self-hosted |
| Lowest paid plan | Not published | Not published |
| Plans published | None | None |
| Maker | Not published | Not published |
| Website | ophysics.com | turtlefsi2.readthedocs.io |
| On physics simulation software | #73 of 89 | #69 of 89 |
oPhysics: what it does well
- Covers nine major physics topic areas
- Interactive controls change model variables
- Includes conceptual and practice activities
- Provides assessment tools and 3D visuals
- Permits non-profit educational use
What to know first
- No authoring tools
- Development remains a work in progress
- Content updates listed through March 2025
- No product plans or prices listed
turtleFSI: what it does well
- Fully monolithic arbitrary Lagrangian-Eulerian solver
- Supports Laplace and biharmonic mesh lifting
- Checkpointing enables restart from saved states
- Runs with MPI parallel tasks
- Writes XDMF files for ParaView
What to know first
- Large 3D cases may trigger MUMPS memory failures
- Biharmonic lifting uses more computation and memory
- Requires FEniCS, NumPy, and Python dependencies
- Installation is oriented to Linux, macOS, or source builds
Alternatives to oPhysics Alternatives to turtleFSI The whole list