Stable Diffusion 3.5 vs Leonardo AI

Detailed side-by-side comparison to help you choose the right tool

Stable Diffusion 3.5

AI Image

Open-source image generation model that runs locally or via cloud APIs. Free to use, customize, and deploy commercially. Stable Diffusion 3.5 requires 11-24GB VRAM but costs $0.04-$0.08 per API image—50% cheaper than Midjourney.

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Starting Price

Free
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Leonardo AI

🟡Low Code

AI Image

Advanced AI image generator with diverse models for artistic creation, photorealism, and character design

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Starting Price

Freemium
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Feature Comparison

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FeatureStable Diffusion 3.5Leonardo AI
CategoryAI ImageAI Image
Pricing Plans41 tiers8 tiers
Starting PriceFreeFreemium
Key Features
  • • Open Source SD 3.5 Model
  • • Local + API Deployment
  • • ControlNet Precision Control
  • • Image generation
  • • Style customization
  • • Prompt understanding

Stable Diffusion 3.5 - Pros & Cons

Pros

  • ✓Completely free model downloads with commercial usage rights—no ongoing licensing fees
  • ✓Local hosting provides unlimited generation and complete data privacy for sensitive projects
  • ✓Civitai's 50,000+ custom models offer specialized styles unavailable on closed platforms like Midjourney
  • ✓ControlNet and LoRA training enable precision control impossible with prompt-only generation
  • ✓API costs ($0.04-$0.08/image) run 50% cheaper than Midjourney for moderate usage
  • ✓Open architecture allows custom integrations and modifications for specific business needs

Cons

  • ✗SD 3.5 Large requires 24GB VRAM ($2000+ GPU) for optimal local performance
  • ✗Installation and setup demands technical expertise—expect 2-4 hours troubleshooting on first attempt
  • ✗Image quality varies dramatically based on model choice, prompts, and parameter tuning
  • ✗Community models may have inconsistent licensing terms despite base model being open-source
  • ✗Text rendering in images lags behind DALL-E 3 and Midjourney for typography-heavy designs

Leonardo AI - Pros & Cons

Pros

  • ✓Creates unique artwork
  • ✓Fast generation speed
  • ✓Multiple style options
  • ✓Good for prototyping

Cons

  • ✗May struggle with text in images
  • ✗Requires clear prompting
  • ✗Limited photo realism

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🔒 Security & Compliance Comparison

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Security FeatureStable Diffusion 3.5Leonardo AI
SOC2——
GDPR——
HIPAA——
SSO——
Self-Hosted——
On-Prem——
RBAC——
Audit Log——
Open Source——
API Key Auth——
Encryption at Rest——
Encryption in Transit——
Data Residency——
Data Retention——
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Read the full reviews to make an informed decision

Review Stable Diffusion 3.5Review Leonardo AI