multi-lora-stack

Multi LoRA Stack for ComfyUI

Powerful standalone ComfyUI custom nodes for managing multiple LoRAs in a single, dynamic interface

A complete replacement for rgthree's Power Lora Loader with zero dependencies and two specialized versions to fit any workflow.

✨ Features

🎛️ Dynamic Interface - Add unlimited LoRA slots with a single click
🔄 Easy Management - Toggle, reorder, and remove LoRAs with intuitive controls
💪 Dual Versions - Choose between full functionality or model-only optimization
📊 Visual Feedback - Clean, wide interface with clear status indicators
⚡ Performance - Efficient loading and processing of multiple LoRAs
🔧 No Dependencies - Standalone implementation, works with any ComfyUI installation

🚀 Quick Start

Installation

1. Clone or download this repository to your ComfyUI custom nodes directory:

   cd ComfyUI/custom_nodes/
   git clone https://github.com/ShmuelRonen/multi-lora-stack.git
   

2. Restart ComfyUI

3. Find the nodes in the loaders category:

   • Multi LoRA Stack - Full version with MODEL + CLIP
   • Multi LoRA Stack (Model Only) - Streamlined model-only version

Basic Usage

1. Add either node to your workflow
2. Connect your base MODEL (and CLIP for full version)
3. Click "➕ Add LoRA" to add LoRA slots
4. Select LoRAs from the dropdown menus
5. Adjust strength values as needed
6. Toggle individual LoRAs on/off or use "Toggle All"

📊 Node Versions

| Feature | Multi LoRA Stack | Multi LoRA Stack (Model Only) | |---------|---------------------|----------------------------------| | Inputs | MODEL + CLIP | MODEL only | | Outputs | MODEL + CLIP | MODEL only | | Best For | Style LoRAs, Character LoRAs, Complex workflows | Flux LoRAs, Performance-focused workflows | | Interface | 4 connection points | 2 connection points | | Performance | Standard | Optimized |

When to Use Which?

Choose Multi LoRA Stack (Full):

• Working with style or character LoRAs
• Need CLIP text encoding modifications
• Maximum compatibility with existing workflows
• Professional/production work

Choose Multi LoRA Stack (Model Only):

• Using modern LoRAs (especially Flux)
• Performance-critical workflows
• Prefer cleaner, simpler interface
• Experimental/testing workflows

🎛️ Controls

Main Controls

• ➕ Add LoRA - Adds a new LoRA slot
• Toggle All LoRAs - Enables/disables all LoRAs at once

Per-LoRA Controls

• Enable Toggle - Turn individual LoRAs on/off
• LoRA Dropdown - Select from available LoRAs
• Strength Slider - Adjust influence (-2.0 to +2.0)
• Remove Button - Delete the LoRA slot

📝 Technical Details

File Structure

multi-lora-stack/
├── __init__.py                          # Node registration
├── multi_lora_stack.py                  # Full version backend
├── multi_lora_stack_model_only.py       # Model-only backend
└── web/
    ├── multi_lora_stack.js              # Full version UI
    └── multi_lora_stack_model_only.js   # Model-only UI

Data Format

LoRA configurations are stored as JSON:

[
  {
    "on": true,
    "lora": "flux/style_lora.safetensors",
    "strength": 1.0
  },
  {
    "on": false,
    "lora": "character_lora.safetensors", 
    "strength": 0.8
  }
]

Backend Processing

• Full Version: Uses ComfyUI's LoraLoader() for MODEL + CLIP processing
• Model Only: Uses ComfyUI's LoraLoaderModelOnly() for optimized model-only processing

🔧 Installation Details

Method 1: Git Clone (Recommended)

cd ComfyUI/custom_nodes/
git clone https://github.com/yourusername/multi-lora-stack.git

Method 2: Manual Download

1. Download the repository as ZIP
2. Extract to ComfyUI/custom_nodes/multi-lora-stack/
3. Ensure the file structure matches the layout above

Method 3: Individual Files

Create the directory structure and copy files:

mkdir -p ComfyUI/custom_nodes/multi-lora-stack/web/
# Copy each file to its respective location

🐛 Troubleshooting

Nodes Don't Appear

• ✅ Verify file structure matches exactly
• ✅ Check ComfyUI console for error messages
• ✅ Restart ComfyUI completely
• ✅ Ensure all Python files are in the root directory

LoRA Dropdown Empty

• ✅ Verify LoRAs exist in models/loras/ directory
• ✅ Test with ComfyUI's standard LoRA Loader first
• ✅ Check file permissions

JavaScript Errors

• ✅ Ensure JS files are in the web/ subdirectory
• ✅ Check browser console (F12) for specific errors
• ✅ Clear browser cache and reload

LoRAs Not Loading

• ✅ Check ComfyUI console for debug output
• ✅ Verify LoRA names match exactly with files
• ✅ Ensure LoRAs are enabled (toggle on)
• ✅ Test strength values (non-zero)

🆚 Comparison with rgthree Power Lora Loader

| Feature | Multi LoRA Stack | rgthree Power Lora Loader | |---------|---------------------|-------------------------------| | Dependencies | ✅ None (standalone) | ❌ Requires rgthree framework | | Installation | ✅ Simple (drop-in) | ❌ Complex (dependencies) | | Versions | ✅ Two optimized versions | ⚪ Single version | | Compatibility | ✅ Any ComfyUI installation | ❌ Requires rgthree ecosystem | | Updates | ✅ Independent updates | ❌ Dependent on rgthree updates | | Interface | ✅ Wide, clean design | ⚪ Compact design |

🤝 Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

Development Setup

# Clone the repo
git clone https://github.com/ShmuelRonen/multi-lora-stack.git
cd multi-lora-stack

# Make changes and test in ComfyUI
# Follow the installation instructions above for testing

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Inspired by rgthree's Power Lora Loader
• Built for the ComfyUI community
• Thanks to all contributors and testers

📞 Support

• Issues: GitHub Issues
• Discussions: GitHub Discussions
• ComfyUI: ComfyUI Repository

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⭐ If this project helps your workflow, please give it a star!

Made with ❤️ for the ComfyUI community