MultiPlaceholder Prompt List

This is the clearest example in the whole pack of the problem it was built to solve. People genuinely ask "how do I make a grid of the same prompt with one token changed" in the ComfyUI community, and the honest answer is always some version of "there's no built-in way - you'll be building it with loops." This node is DemonAlone's answer to exactly that question: instead of hand-typing every variant of a prompt, you write one template and let the node generate every combination for you.

What it does

You write a Template with placeholder tokens in it - the default is "a girl in a {color} dress with {hair} hair". Then, for each placeholder, you list its candidate values: placeholder1 set to {color}, values1 set to "blue, red, black"; placeholder2 set to {hair}, values2 set to "blonde, brown, black". A third, optional pair (placeholder3/values3) is there if you need a third axis. Leave it blank and it's simply not used.

The node then substitutes every possible combination of your value lists into the template and outputs the whole set as a LIST of finished prompt strings - with the defaults above, that's 3 colors × 3 hair values = 9 fully-formed prompts, generated automatically instead of typed out by hand. Fill in a third axis and the count multiplies again. values_separator (default a comma) controls how each values field gets split; switch it to \n if any of your actual values need a literal comma inside them, so the node doesn't split in the wrong place. And if you want a combination where a placeholder should resolve to nothing at all - the phrase just isn't inserted - use the special value _empty_ in that placeholder's value list.

Wire the resulting LIST into a loop, and you've got a working prompt-grid pipeline: one graph run per generated prompt, without ever duplicating the sampling nodes.

Installing it

ComfyUI Manager: search DemonAlone-nodes-ComfyUI, install, restart. Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/DemonAlone/SimpeStringGenerator_ComfyUI

No dependencies or downloads beyond core ComfyUI - this node is pure string logic, nothing heavier.

Where people get burned

The separator is the most common trip-up. If any value in your list genuinely needs a comma - a phrase like "red, slightly faded" as one single value - the default comma separator will chop it into two separate values instead of treating it as one. Switch values_separator to \n and put one value per line instead.

The other one: your placeholder text has to match the template exactly, braces included. {color} in the Template field but placeholder1 set to just color without the braces won't substitute anything - copy the format from the node's own defaults rather than guessing at it. And remember combinations multiply fast: three axes of even five values each is 125 prompts, which is 125 full generations downstream if you feed the whole list into your sampler loop - know your count before you queue it.