PM LoRA Power Stacker

This is the stacker you actually want when your LoRA folder has crossed into triple digits. Where the plain stacker gives you one connection point per LoRA, the Power Stacker gives you a widget with an "Add LoRA" button, a searchable dropdown that filters your collection as you type, and a checkbox to enable or disable each LoRA without removing it. If you've ever squinted at a 400-item LoRA dropdown, you know why that search bar is the headline feature.

It's the front door of the pack's merge workflow: collect LoRAs, set strengths, and hand the stack off to decompose and merge. The author built it for the real complaint in this space - that merging is a headache compared to just lowering strengths and stacking - and the pack's reputation among r/comfyui users who tried it is genuinely good.

How it works

Wire in a model and clip, then add LoRA slots from the widget. Click a LoRA name to open the searchable list; type to filter; pick one. Each slot gets its own strength. The node builds a LoRAStack (UNet + CLIP patches, filtered by the layer filter) and LoRAWeights (the strengths). Architecture detection runs automatically, so the same stacker works for SD1.5, SDXL, DiT, Flux, Wan 2.2, Qwen Image Edit, and zImage LoRAs.

The inputs that matter

• model and clip - the checkpoint's model and CLIP. The node uses them to resolve key mappings when loading each LoRA.
• Everything else lives in the widget: add slots, pick LoRAs, set per-slot strengths, toggle them on/off.

Two outputs, LoRAStack and LoRAWeights, which feed PM LoRA Stack Decompose. The CLIP weights are preserved in the outputs, so merged results can still touch the text encoder.

Installing

Part of the LoRA Power-Merger pack. ComfyUI Manager (search "LoRA Power-Merger") or:

cd ComfyUI/custom_nodes
git clone https://github.com/larsupb/LoRA-Merger-ComfyUI
cd LoRA-Merger-ComfyUI
pip install -r requirements.txt

Restart ComfyUI. Dependencies: PyTorch, lxml, mergekit. The search bar is a web component (the pack ships a js/ folder), so a browser cache-clear after updating is worth doing if the widget misbehaves.

Common issues

The classic complaint from the pack's early days was the dynamic connection points not appearing on the plain stacker - the Power Stacker sidesteps that entirely with its widget-based slots, so if you hit that on an old version, move here. If the search dropdown doesn't show your files, double-check the LoRA folder path ComfyUI is scanning (it reads the same models/loras directory the standard loader uses). And since each slot carries its own strength, remember a disabled slot (checkbox off) still exists - it just doesn't contribute, which is exactly the workflow you want when A/B-ing a merge.