| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Linux | Yes | Yes |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 1 |
| Spec score · Physics Simulation Software | 8.6 (#12) | 8.4 (#16) |
| Free plan | Yes | Yes |
| Intended users | The project describes FDTDX as freely usable for research, development, and commercial work involving photonic nanostructures. | The library is designed for application developers whose codes have their own discretization infrastructure and need optimized discretization kernels. |
| Purpose | FDTDX is an open-source Python package for simulating and designing three-dimensional photonic nanostructures with the Finite-Difference Time-Domain method. | libCEED is a library for matrix-free operator representation focused on high-order finite elements and other discretizations in factored form. |
| Support | The FAQ invites users to open GitHub discussions for unanswered questions and issues for suspected bugs, and says the maintainers regularly check discussions. | The libCEED team can be reached by email at [email protected] or through comments in the issue tracker. |