Combo Switch

Switching between two models or two settings with a boolean is straightforward - that's what input switches are for. But switching between two dropdown values - two sampler names, two CLIP types, two model filenames that then feed a loader's combo input - is awkward, because combo values come from lists, not wires. Combo Switch is the missing piece: a boolean picks which dropdown value comes out.

How it works

The boolean input (default true) is the selector. Then each side is a pair: a true_options / false_options string defining the choices, and an on_true / on_false combo that selects the current value from its list.

The options strings are pipe-separated - dpmpp_2m|euler|ddim - and whatever you type there becomes the dropdown for that side. So you can define one list for the true branch and a completely different list for the false branch, then flip between them with a single boolean.

Three outputs:

• COMBO - the selected value, as a combo (drops into a loader's combo input).
• STRING - the same value as a plain string (drops into anything string-taking).
• index - the position of the selected value within its option list (-1 if not found), handy for driving numeric logic off the selection.

Concretely: a boolean "use fast sampler" true → euler, false → dpmpp_2m_karras, and the chosen name flows into a KSampler's sampler input. Same trick works for CLIP types, model names, upscale methods - anywhere a combo input wants a choice.

Where it fits

It's marked experimental in the pack, which is honest: combo wiring is the fiddliest corner of ComfyUI's new API, and this node is where Nifty's author chose to expose it. It works, but it's a bit more manual than the plain switches - you define the option lists yourself rather than them being auto-populated. For the "two preset dropdowns, one boolean" case it's genuinely the right tool and simpler than hacking a string switch to feed a combo.

Install

Part of Nifty Nodes for ComfyUI. Manager: search "Nifty Nodes for ComfyUI" → Install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/Stibo/comfyui-nifty-nodes

Restart ComfyUI. Pure Python, no models, no special dependencies. MIT-licensed, v3-API native, young pack (v2.1.0, mid-2026) - update it if a workflow references these classes and ComfyUI doesn't recognize them.

Gotchas

The pipe syntax is the usual trip: option1|option2 - no spaces around the pipes, or the spaces become part of the option names. And the on_true / on_false selectors only make sense against their own option lists; if you type a value that's not in that side's list, index returns -1 and whatever loader you feed may choke. Also, because the values are strings, they'll happily feed a loader that then errors on a bad name - the switch won't validate that the name exists as a real model or sampler.