ComfyUI Comparison Grid

A custom ComfyUI node that generates comparison grids in a single node. Compare any two parameters (LoRA, strength, seed, steps, CFG, sampler, scheduler, denoise) across rows and columns, with labeled cell images and an assembled grid output.

Installation

Clone this repo into your ComfyUI custom_nodes directory:

cd /path/to/ComfyUI/custom_nodes
git clone https://github.com/evandcoleman/comfyui-comparison-grid.git

Restart ComfyUI. The node will appear under image/comparison as Comparison Grid.

How It Works

The Comparison Grid node replaces what would normally be a large multi-node workflow (100+ nodes for a 4x4 grid) with a single node. Internally it:

1. Parses row and column axis values
2. Pre-loads all needed LoRA weights
3. Iterates over every row/col combination, running the full pipeline per cell:
   • Applies LoRA (if applicable)
   • Samples (KSampler equivalent)
   • Decodes via VAE
   • Overlays a text label ("row_label | col_label")
4. Assembles all cells into a labeled grid image with row/column headers

Node Inputs

Required

Input	Type	Description
model	MODEL	Base diffusion model
clip	CLIP	CLIP model
vae	VAE	VAE for decoding
positive	CONDITIONING	Positive prompt conditioning
negative	CONDITIONING	Negative prompt conditioning
latent_image	LATENT	Starting latent (e.g. from EmptyLatentImage)
row_axis	COMBO	Parameter to vary across rows
row_values	STRING	One value per line for the row axis
col_axis	COMBO	Parameter to vary across columns
col_values	STRING	One value per line for the column axis
default_lora	COMBO	Default LoRA file (used when lora is not an axis)
default_strength	FLOAT	Default LoRA strength
default_seed	INT	Default seed
default_steps	INT	Default sampling steps
default_cfg	FLOAT	Default CFG scale
default_sampler	COMBO	Default sampler algorithm
default_scheduler	COMBO	Default scheduler
default_denoise	FLOAT	Default denoise strength
font_size	INT	Label font size
font_color	STRING	Label text color (hex, e.g. #FFFFFF)
bg_color	STRING	Label background color (hex, e.g. #000000)

Optional

Input	Type	Description
font_path	STRING	Path to a .ttf font file
lora_name	*	LoRA filename from an upstream download node
lora_N	*	Additional LoRA filenames (dynamic inputs: lora_1, lora_2, ...)

Outputs

Output	Type	Description
cell_images	IMAGE	Batch of all labeled cell images (R*C images, row-major)
grid_image	IMAGE	Single assembled grid image with row/column headers
num_rows	INT	Number of rows in the grid
num_cols	INT	Number of columns in the grid

Axis Parameters

Any two of these can be used as row/column axes:

Parameter	Value Format	Example
lora	Filename (from loras/ folder)	my_lora.safetensors
strength	Float	0.5, 0.75, 1.0
seed	Integer	12345, 67890
steps	Integer	10, 20, 30
cfg	Float	1.5, 4.0, 7.0
sampler	Sampler name	euler, dpmpp_2m_sde
scheduler	Scheduler name	normal, karras
denoise	Float (0-1)	0.5, 0.75, 1.0

Values are entered one per line in the multiline text inputs.

LoRA Integration

LoRA files are loaded from ComfyUI's standard loras/ folder via folder_paths. There are two ways to provide LoRAs:

From the dropdown (non-axis default)

Select a LoRA from the default_lora dropdown. This is used when lora is not one of the axes.

From upstream download nodes (axis or default)

Connect one or more lora_name / lora_N inputs from upstream nodes that output filenames (e.g. comfyui-model-manager's ModelManagerLoRADownload node).

When lora is an axis, the linked LoRA inputs become the axis values automatically, replacing whatever is in the multiline text field. The label for each LoRA is derived from its filename (extracting "Epoch N" patterns when present).

Example Workflow

A minimal workflow with this node:

UNETLoader ─────────────┐
CLIPLoader ──┬──────────┤
             |          |
CLIPTextEncode(+) ──────┤
CLIPTextEncode(-) ──────┤
VAELoader ──────────────┤
EmptyLatentImage ───────┤
                        |
ModelManagerLoRADownload ──┐
ModelManagerLoRADownload ──┤
ModelManagerLoRADownload ──┤
ModelManagerLoRADownload ──┤
                           ▼
                   ComparisonGrid
                           |
                           ▼
                     SaveImage

A companion workflow generator script (generate_workflow.py) is available in the LoRA-Testing project that builds this workflow from a simple config.

License

MIT