Kohya_ss
The standard SDXL/Flux LoRA training UI.
Open Source 12–24 GB VRAM
- Min VRAM
- 12 GB
- GPU class
- High-end GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free
OneTrainer
Modern alternative trainer for SD/SDXL/Flux.
Open Source 12–24 GB VRAMRuns locally
Actually FreeNo SignupOpen SourceWatermark-FreeHobbyist-Friendly
Visit OneTrainerUpdated 2026-04-20 · Direct link
Hardware requirements
Runs locally · High-end GPU (16–24 GB)
Min VRAM
12 GB
Rec. VRAM
24 GB
Min RAM
32 GB
Rec. RAM
64 GB
Disk
80 GB
GPU class
High-end GPU
CUDA 12.xNo Apple SiliconGPU RequiredQuant: FP16, BF16
SDXL LoRA fits 12 GB. Flux LoRA wants 24 GB.
Screenshot placeholder · OneTrainer
What is OneTrainer?
OneTrainer is a cleaner, more modern training UI than Kohya for many use cases. Strong concept training, masked training, and presets for SDXL & Flux.
Pros & cons
Pros
- Cleaner UI than Kohya
- Masked training is excellent
- Good docs
Cons
- Smaller community
- Fewer ready-made configs floating around
What's actually free?
Free / OSS.
✓ Actually FreeNo SignupOpen SourceWatermark-Free