| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | — | Yes |
| Linux | Yes | Yes |
| API | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Physics Simulation Software | 8.6 (#12) | 7.7 (#45) |
| Delivery mode | desktop | desktop |
| Free plan | Yes | Yes |
| Intended users | The project describes FDTDX as freely usable for research, development, and commercial work involving photonic nanostructures. | ECSIM describes its software as open-source simulation tools for applied electrochemistry researchers, including people working with fuel cells. |
| Purpose | FDTDX is an open-source Python package for simulating and designing three-dimensional photonic nanostructures with the Finite-Difference Time-Domain method. | OPEM models and evaluates proton-exchange membrane fuel-cell performance using static and dynamic models. |
| 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 README directs users to file an issue or email [email protected] for bug reports, and mentions a Discord server. |