SimpliGen: ComfyUI Outcomes with Normal SaaS UX

What's a LoRA?

A LoRA is a small style or character add-on that you stack on top of an image model. They add a particular look, character, or effect without having to retrain the whole model. They're tiny compared to a full checkpoint, usually 50 to 300 MB.

1. Open the LoRA library

In the left sidebar, click Models. Inside the Model Manager, switch to the LoRAs tab.

Model Manager with the LoRAs tab selected

2. Add a LoRA

Click Add LoRA. You'll see two tabs:

From URL: paste a direct link to a .safetensors file from HuggingFace or CivitAI. SimpliGen downloads it for you.
Upload File: pick a .safetensors file you already have on your computer.

Add LoRA modal, From URL tab

Add LoRA modal, Upload File tab

3. Fill in the details

You'll be asked for a few things:

Display Name: what you'll see in the picker later. Pick something you'll recognize, like Cinematic Realism v2.
Base Model: the model architecture this LoRA was trained for (SDXL, FLUX, Wan 2.2, etc.). This matters. A LoRA trained for SDXL won't work on FLUX, and SimpliGen will warn you if you try to use a mismatched LoRA.
Trigger Words (optional): comma-separated words that activate the LoRA's effect. They get added to your prompt automatically. Check the LoRA's page on HuggingFace/CivitAI for these.
Default Strength: how strongly the LoRA influences the result. 1.0 is the standard starting point; 0.7 is gentler.

Hit Save (or Download & Add if you used the URL tab) and SimpliGen adds it to your library.

4. Use it in a generation

Open the prompt builder and pick a preset that matches the LoRA's base model. Scroll down to LoRAs (optional). Click + Add LoRA, pick your LoRA from the list, and tweak the strength if you want. You can stack several LoRAs together.

LoRA stack selector in the prompt builder with a LoRA active

Generate as normal. The LoRA's trigger words (if you set any) get mixed into the prompt automatically.

Tips that save pain

Match base models

A LoRA's Base Model has to match the preset's model. SimpliGen shows a yellow "Built for X" warning when the LoRA and preset don't line up. You can override it ("Use anyway"), but the result will usually be poor.

Where to put trigger words

Trigger words go in your prompt, not in the Display Name field. If you set them when adding the LoRA, SimpliGen handles this for you automatically.

Strength sweet spot

Most LoRAs land between 0.7 and 1.0. Push higher for a stronger effect, lower if the LoRA is overpowering your prompt.

Troubleshooting

"My LoRA doesn't show up in the picker." Check the Base Model filter at the top of the LoRA tab; it might be filtering yours out. Also try searching by name in the search box.

"The result looks the same as without the LoRA." Two usual causes: strength is too low (try 1.0), or the trigger words aren't in your prompt. Open the LoRA's page on HuggingFace or CivitAI and check what trigger words it expects.

"Generation fails right after I add a LoRA." The file is probably corrupted, or it's for a different model architecture than what you set. Try re-downloading, or try a different LoRA to confirm.

Still stuck? Hop into our Discord. We help out there daily.

Using LoRAs