Incrementing Int to String (Nukun)

Every batch workflow eventually needs a number that ticks up each run - a run counter in the filename, an index that feeds a folder cycler, a label that distinguishes frame 1 from frame 100. The classic ComfyUI way is two nodes: an Int primitive and an "Int to String" converter, wired together and converted to inputs so the value can flow as text. It works. It's also a small pile of graph spaghetti for something that should be one widget.

NukunIncrementingIntString collapses that into a single node from the Nukun pack. It takes one integer, wraps it inside a min/max range, and hands you the result as a plain string, ready for a filename builder or a text concat.

How it works

You get three integer widgets. value is the counter - and here's the useful part - it has ComfyUI's control_after_generate support built in, so right-click it and set increment, and the number advances by one after every generation. min_value and max_value define the cycle: when the value walks past max_value, it wraps back around to min_value. If you accidentally set max below min, the node just swaps them rather than erroring out - a small touch, but a friendly one.

It's a pure function under the hood: low + ((value - low) % cycle_size). No state, no hidden math, deterministic every time.

The outputs

Three, so you can use it in whatever form fits:

• STRING - the wrapped value as a plain string. No thousands-separator commas, which is the usual gotcha with stock converters when your count crosses 999 and suddenly filenames read "1,000".
• INT - the same wrapped number as an integer, for anything that wants the math type.
• raw_value - the unwrapped input, so you can see the "real" counter before cycling if you ever need to know how many total runs happened.

The typical wiring: STRING into a Save Image filename template or an Anywhere/reroute that feeds text nodes, control_after_generate = increment on the value widget, and you have per-run numbering with zero extra nodes.

Installing it

Part of the Nukun pack, so install once and you get all its nodes:

cd ComfyUI/custom_nodes
git clone https://github.com/OnekoSL/Nukun_ComfyUI_Nodes.git

Restart ComfyUI (or search "Nukun" in ComfyUI Manager). No model downloads, no heavy deps - numpy, Pillow, scipy, PyWavelets at most.

The one trap: "after generate" semantics

This is the same gotcha that bites everyone with seed nodes, worth repeating here: control_after_generate fires after the run, so the number shown in the widget is the one that will be used next, not the one that just produced the image you're looking at. If you want the printed filename to match the run that made it, flip ComfyUI's global "widget control mode" to Before in settings, once. Do that and this node becomes the quiet, dependable counter you forgot was even there.