Stable Diffusion & Flux in-depth review: the freedom and threshold of open source image generation

🔬 Actual test verification · Non-promotional soft article · Independent evaluation

Overall rating: 8.3/10

Stable Diffusion It is synonymous with open source AI image generation. Midjourney and the most important pole outside of DALL-E.

📊 Five-dimensional scorecard

维度ScoreBrief comment
functional completeness8.5 / 10Image + video + editing + ControlNet, the most complete open source ecological function
易用性7.0 / 10There are barriers to local deployment, but online services reduce the difficulty of getting started.
Cost-effectiveness9.0 / 10It’s open source and free, and it’s also cheap to use in the cloud.
中文支持7.0 / 10The prompt words are mainly in English, and Chinese is not as well understood. Midjourney
输出质量8.5 / 10Flux image quality is close to Midjourney, but the style consistency is slightly weaker

✅ Core advantages

  • Completely open source and free:Download models to run locally without any company API restrictions or content moderation.
  • LoRA has a rich ecosystem:The community has contributed a large number of LoRA models, which can quickly and accurately generate specific styles, characters, and scenes.
  • Flux image quality leap:Black Forest Labs’ Flux series dramatically shrinks the Midjourney The picture quality gap has improved significantly, especially in text rendering and realism.
  • ControlNet precise control:With precise control over composition, pose, depth, edges and more, it's a tool for designers and professionals, not a toy.
  • ComfyUI Workflow:The node-based visual workflow system makes the complex image generation process as flexible as building blocks.

❌Main shortcomings

  • High barrier to entry:Local deployment requires a better graphics card (8GB+ video memory recommended),ComfyUI The learning curve is steep.
  • Not as good as out-of-the-box Midjourney:Midjourney Simply inputting a few words can produce stunning results, but Flux needs more sophisticated prompt word engineering.
  • Version fragmentation:SD1.5, SDXL, SD3, Flux... there are too many different versions and derivative models, and novices can easily get lost.
  • Chinese prompt word experience is average:The understanding of Chinese prompt words is not as accurate as that of English.

💰 How to use

WaycostApplicable scenarios
Local deployment (SD/Flux)Free (graphics card required)Privacy sensitive, requires in-depth customization
Replicate/Fal Cloud APIAbout $0.002-0.05/pieceBatch generation, application integration
ComfyUI OnlineFree/PaidVisual workflow without local hardware

🎯 Who is it suitable for?

  • AI image creator:Professionals who want to deeply customize their style and finely control their output
  • Developer:Need to integrate image generation into a product or workflow
  • Businesses and Studios:Business scenarios with requirements for data privacy and content compliance
  • Not suitable for:Ordinary users who just want to produce beautiful pictures quickly and don’t want to bother with technology (choose Midjourney)

📝 Summary

Stable Diffusion / Flux is an image generation tool for people who "want to control everything". Midjourney Freedom you'll never get - local deployment, LoRA fine-tuning, ControlNet precision. Midjourney More peace of mind.

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