Prompt Tester Node for ComfyUI

The Prompt Tester is a custom ComfyUI node that helps analyze the influence of individual phrases in a prompt. It splits a prompt into components and generates variations with each phrase removed, allowing easy comparison of their impact on generated outputs.

Features

• Automatically splits prompts based on a customizable delimiter.
• Optionally includes a full-prompt baseline for comparison.
• Labels each prompt variation clearly for easy tracking.
• Output is structured for batch generation and side-by-side evaluation.

Installation

1. Locate your ComfyUI custom nodes folder

2. Clone or download this node into its own subfolder inside the custom_nodes folder. For example:

   cd ComfyUI/custom_nodes
   git clone https://github.com/drphero/comfyui_prompttester.git

3. Restart ComfyUI to load the new node.

Usage

• Node Name in UI: Prompt Tester (found under utils/prompting)

• Inputs:

  • prompt (string, multiline): The full text prompt you want to test.
  • delimiter (string): The character or word used to split the prompt into parts (default is comma ,).
  • include_baseline (boolean): Whether to include the original full prompt as the first item in the output list.

• Outputs:

  • prompts (list of strings): Each string is a prompt variation with one phrase removed.
  • labels (list of strings): Each label corresponds to the phrase omitted in that variation (or "Baseline Full Prompt").

Example

Input Prompt:

blurry, low quality, jpeg artifacts, ugly, text, watermark, signature

Delimiter: ,

Output Prompts:

1. blurry, low quality, jpeg artifacts, ugly, text, watermark, signature (baseline)
2. low quality,jpeg artifacts,ugly,text,watermark,signature
3. blurry,jpeg artifacts,ugly,text,watermark,signature
4. blurry,low quality,ugly,text,watermark,signature
5. blurry,low quality,jpeg artifacts,text,watermark,signature
6. blurry,low quality,jpeg artifacts,ugly,watermark,signature
7. blurry,low quality,jpeg artifacts,ugly,text,signature
8. blurry,low quality,jpeg artifacts,ugly,text,watermark

Output Labels:

1. Baseline Full Prompt
2. blurry
3. low quality
4. jpeg artifacts
5. ugly
6. text
7. watermark
8. signature

Use Cases

• Prompt debugging and optimization.
• Finding which part of a prompt contributes most to visual output.