FDTDX

8.0easy start · #8 of 91
in Physics Simulation Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on Linux, self-hosted.

FDTDX is ranked #8 of 91 in physics simulation software on The Geeks Club. It runs on Linux, Self-hosted. There is a free plan.

FDTDX plans and pricing

All plans

FDTDX Free Open source · freely available for research, development, and commercial use fdtdx.readthedocs.io · 4 Oct 2026

Compared on physics simulation software

Free plan: Yes
Delivery mode: desktop
Lesson library: No
Authoring tools: Yes
Assessment tools: No
3D visuals: Yes
Data export: Yes

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The record

Purpose: FDTDX is an open-source Python package for simulating and designing three-dimensional photonic nanostructures with the finite-difference time-domain method.
JAX: FDTDX is built on JAX and provides automatic differentiation for gradient-based optimization.
GPU support: The project describes GPU-accelerated simulations with multi-GPU scaling capabilities.
Memory: FDTDX uses time-reversibility in Maxwell’s equations for efficient gradient computation.
Scale: The documentation says FDTDX can handle simulations with billions of grid cells.
API: Its API supports positioning and sizing objects using absolute or relative coordinates.
License and cost: FDTDX is freely available for research, development, and commercial use under the MIT license.
Installation: The project documents installation with pip install fdtdx.
Accelerators: The project recommends JAX GPU acceleration packages for NVIDIA GPUs, AMD GPUs, and TPUs.
Integrations: The API includes functions for importing GDS polygons and working with GDS layer stacks and ports.
Documentation: The project provides an API reference, tutorial guides, and best-practice documentation.
Support: The repository provides community support through GitHub issues and discussions.
Security: The repository page lists a Security and quality section but does not state a security certification or compliance standard.
Audience: The project presents FDTDX for research, development, and commercial use in photonic nanostructure simulation and design.
Price from: Free

Where it ranks on The Geeks Club

Best Physics Simulation Software in 2026#8 of 91

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Sources

fdtdx.readthedocs.io/en/latest/· checked 3 Oct 2026
github.com/ymahlau/fdtdx· checked 3 Oct 2026
fdtdx.readthedocs.io/en/latest/01_quickstart.html· checked 4 Oct 2026
fdtdx.readthedocs.io/en/latest/06_faq.html· checked 4 Oct 2026