# ssitu/ComfyUI_UltimateSDUpscale

ComfyUI nodes for the Ultimate Stable Diffusion Upscale script by Coyote-A.

Repository: https://github.com/ssitu/ComfyUI_UltimateSDUpscale
Canonical: https://ross.abutalabs.com/products/comfyui_ultimatesdupscale
Language: Python
License: GPL-3.0
License Family: copyleft
Topics: comfyui, stable-diffusion
Last push: 2026-06-22T04:09:55+00:00

## Health v2 (maintenance only)
Score: 69/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 88, release rhythm 35, longevity 86
- inputs: {"age_days": 1205, "days_push": 72, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1547, forks 120 (observed 2026-08-28T04:05:01.735384+00:00)

## What it is
A ComfyUI custom node pack implementing the Ultimate Stable Diffusion Upscale script, which runs image-to-image diffusion on large images in tiles. It improves detail on upscaled images while keeping memory requirements low and image sizes within the model's training range.

## Use cases
- upscale a stable diffusion image to large sizes without running out of VRAM
- add fine detail to low-resolution AI-generated images
- run tiled img2img diffusion on a big picture in ComfyUI
- enlarge AI art for printing while preserving sharpness
- replace plain upscaling with diffusion-based detail enhancement
- build an upscaling workflow template in ComfyUI

## When to choose
- you already use ComfyUI and want tiled diffusion upscaling nodes
- your GPU cannot process full-size large images in one pass
- you want the A1111 Ultimate Upscale behavior inside ComfyUI workflows

## When to avoid
- you use Automatic1111 Web UI instead of ComfyUI (use the original extension)
- you only need simple interpolation upscaling without diffusion
- you do not run ComfyUI at all

## Facets
- artifact type: plugin
- maturity: active
- function: image-processing, stable-diffusion, plugin-system
- domain: image-processing, artificial-intelligence, graphics
- platform: python, cross-platform
- tags: comfyui, comfyui-custom-nodes, upscaling, tiled-diffusion, stable-diffusion, image-upscale, gpu

## Member repositories
- ssitu/ComfyUI_UltimateSDUpscale (main) score 69

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:01.735384+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:30:30.598692+00:00, confidence not recorded.
  - readme: https://github.com/ssitu/ComfyUI_UltimateSDUpscale (fetched 2026-08-28T04:05:01.735384+00:00, sha badfa2c5d956)
- Data as of 2026-08-30T08:39:29.467469+00:00.