LogicUtil_Bitwise Xor

The one-line version

LogicUtil_Bitwise Xor returns an integer whose bits are 1 where the two inputs differ - one has a 1 and the other has a 0. XOR ("exclusive or") is the toggle operator: XOR the same value twice and you get back what you started with. In a diffusion graph that makes it great for flipping seeds or flags without tracking any state.

It's part of the LogicUtil family inside ComfyUI-JDCN, the pack people mostly know for its folder/file nodes (the JDCN_* tools that get recommended on r/comfyui for directory-based loading). LogicUtil is the pack's logic toolbox, credited in the source to aria1th's ComfyUI-LogicUtils.

How it works

Bit by bit: output bit is 1 only when the inputs disagree.

• 12 ^ 10 → 1100 ^ 1010 → 0110 → 6
• 5 ^ 3 → 101 ^ 011 → 110 → 6
• 255 ^ 255 → 0 (every bit agrees)

That last property - x ^ x == 0 and x ^ y ^ y == x - is the party trick. You can flip a value and flip it back with no memory node required.

The source is input1 ^ input2, Python's XOR operator. Nothing else to it.

Inputs and outputs

• input1 (INT) - first integer, default 0
• input2 (INT) - second integer, default 0
• Output: INT - the bitwise XOR

Two integer inputs, one integer output. Standard.

Installing it

Same install as the whole pack:

Easiest - ComfyUI Manager → Install Custom Node → search ComfyUI-JDCN → install → restart.

Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/daxcay/ComfyUI-JDCN.git
cd ComfyUI-JDCN
pip install -r requirements.txt

Restart ComfyUI. The only dependency in the pack is piexif; no models, no API keys.

Common issues

• INT only. Floats throw a TypeError. Integer sources.
• XOR is not OR. Or sets a bit if either input has it; Xor sets it only if exactly one does. 3 | 5 is 7, but 3 ^ 5 is 6. If your mask math suddenly looks off by one, check whether you grabbed Xor when you meant Or.
• It's the least "intuitive" of the bitwise gates. If a workflow shows XOR and you don't know why it's there, the author is probably using the toggle trick above - leave it alone unless you're modifying that logic deliberately.

When you'd actually reach for it

Toggle flags deterministically: seed ^ 0x1234 gives you a "second variant" seed you can flip back and forth between, which is handy for A/B comparisons in a loop. It's also the classic hash/checksum primitive. Niche, but when you need a reversible flip, nothing else in this family does it in one node.