| 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) | 8.0 (#34) |
| Assessment tools | No | No |
| Authoring tools | Yes | No |
| Data export | Yes | No |
| Delivery mode | desktop | hybrid |
| Free plan | Yes | Yes |
| Installation | The maker provides a pip installation command and an editable installation path for development. | The library can be installed with pip or conda. |
| Intended users | The project describes FDTDX as freely usable for research, development, and commercial work involving photonic nanostructures. | Documented use cases include reactor reconfiguration, fuel shuffling, model parameter studies, and updating models with results from other codes. |
| Lesson library | No | No |
| Purpose | FDTDX is an open-source Python package for simulating and designing three-dimensional photonic nanostructures with the Finite-Difference Time-Domain method. | MontePy is a Python library for reading, editing, and writing MCNP input files. |
| 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 project directs users to open GitHub issues for feature requests and lists an email address for questions. |
| 3D visuals | Yes | No |