Dependencies

External Python packages ComfyUI relies on. The pinned list is in requirements.txt. Manager dependencies are in manager_requirements.txt. Test dependencies are in tests-unit/requirements.txt.

Runtime — required

Comfy Org packages

Package	Pin	What it provides
comfyui-frontend-package	==1.42.15	The Vue/TS frontend bundle served from web/
comfyui-workflow-templates	==0.9.63	Stock workflow templates
comfyui-embedded-docs	==0.4.4	In-app documentation
comfy-kitchen	>=0.2.8	Comfy Org helpers used in the engine
comfy-aimdo	==0.3.0	DynamicVRAM scheduler. Imported in main.py and comfy.model_patcher

PyTorch

Package	What it provides
torch	Tensors and autograd
torchsde	SDE samplers
torchvision	Image transforms
torchaudio	Audio I/O

The wheel selection (CUDA, ROCm, XPU, CPU, MPS) is the user's choice — the README documents per-vendor commands.

Numerical / ML

Package	Pin	What it provides
numpy	>=1.25.0	Array math
einops	-	Tensor shape ops in model code
transformers	>=4.50.3	Tokenizers, T5/Llama configs
tokenizers	>=0.13.3	BPE/Sentencepiece via Rust
sentencepiece	-	Sentencepiece tokenizer for T5/Gemma/Llama
safetensors	>=0.4.2	Safe serialization. The default checkpoint format
kornia	>=0.7.1	Image processing (canny, morphology, …)
spandrel	-	Architecture-detect upscalers and friends
scipy	-	Stats and linalg helpers
Pillow	-	Image I/O
tqdm	-	Progress bars (used internally by some loaders)
psutil	-	Free RAM probe (RAM-pressure cache, model_management)
blake3	-	Fast hashing for the assets system

Server / web

Package	Pin	What it provides
aiohttp	>=3.11.8	The HTTP/WebSocket server
yarl	>=1.18.0	URL parsing (peer of aiohttp)
pydantic	~=2.0	Schemas (used in comfy_api_nodes/ and asset routes)
pydantic-settings	~=2.0	Settings binding
requests	-	Synchronous HTTP (used by some legacy loaders)
simpleeval	>=1.0.0	Safe expression evaluator for prompt math nodes

Storage

Package	Pin	What it provides
SQLAlchemy	>=2.0.0	ORM for the assets system
alembic	-	Migrations
filelock	-	Cross-platform DB lockfile
pyyaml	-	extra_model_paths.yaml

Media

Package	What it provides
av	Video / audio container I/O (PyAV)
PyOpenGL	OpenGL bindings for GLSL preview/postprocess
glfw	Window/context creation for OpenGL

comfy_extras/nodes_glsl.py is the main consumer of PyOpenGL/glfw — the GLSL shader runner.

Optional / manager

manager_requirements.txt is just:

comfyui-manager

Installed only when the user wants the Manager.

Test-only

tests-unit/requirements.txt installs pytest + helpers. Tests don't pull GPU dependencies — most tests skip when no GPU is available rather than failing the build.

What ComfyUI does not depend on

A few things that are notably absent and are sometimes installed per-need by users or custom nodes:

• xformers — used if installed (auto-detected) but not required.
• flash-attn, sageattention — used with --use-flash-attention / --use-sage-attention only.
• torch_xpu, torch_directml, torch_npu, torch_mlu — Intel/Microsoft/Ascend/Cambricon-specific PyTorch extensions installed by users with that hardware.
• huggingface_hub — only needed for some custom nodes; core never auto-downloads from HF.
• diffusers — supported as an input format but not as a runtime dependency.

License

ComfyUI itself is GPL-3.0 (LICENSE). Most direct dependencies are MIT/BSD/Apache. Some optional vendored chaiNNer code under comfy_extras/chainner_models/ carries its own license — preserved in-tree.