Design Tools · head to head
PaintTool SAI vs Stable Diffusion

PaintTool SAI
Design Tools
Lightweight digital painting and illustration software for Windows
- From
- 5500/month
- Rated
- -
The short version
- Only Stable Diffusion has a free tier, so it costs nothing to try first.
- Each has a real cost: PaintTool SAI windows-only software with no native Mac or Linux version.; Stable Diffusion generated images have lower resolution and quality at non-standard dimensions
- They diverge on capability: PaintTool SAI covers Pressure-Sensitive Tablet Support, Stable Diffusion covers Text-to-image.
Where they differ
Only the attributes on which PaintTool SAI and Stable Diffusion actually diverge.
| Attribute | PaintTool SAI | Stable Diffusion |
|---|---|---|
| Starting price | 5500/month | Free |
| Pricing model | one-time | Unknown |
| Free tier | No | Yes |
| Platforms | windows | Web, Local (GPU-based), Cloud APIs |
| Category | Design Tools | AI Tools |
| Founded | Unknown | 2019 |
Identical on both: user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in PaintTool SAI
- Pressure-Sensitive Tablet Support
- Anti-Aliased Brushes
- 16-bit ARGB Color Channels
- Lightweight Performance
- Crash Data Protection
Only in Stable Diffusion
- Text-to-image
- Image-to-image
- Inpainting
- LoRA support
- ComfyUI
- Automatic1111
- Multiple UIs
- Local support
What people use each for
The jobs each tool is most often brought in to do.
PaintTool SAI
- Digital illustration and manga artnot Stable Diffusion
- Line art and inking with pressure-sensitive pensnot Stable Diffusion
- Lightweight painting on lower-spec computersnot Stable Diffusion
- Character and concept art sketchingnot Stable Diffusion
Stable Diffusion
- ai tools managementnot PaintTool SAI
- Workflow automationnot PaintTool SAI
- Reportingnot PaintTool SAI
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
PaintTool SAI
- Windows-only software with no native Mac or Linux version.
- Only supports 32-bit operation, lacking modern 64-bit performance benefits.
- Lacks the advanced brush engine customization and layer effects found in tools like Photoshop or Clip Studio Paint.
- No cloud sync or mobile app, unlike many modern illustration tools.
Stable Diffusion
- Generated images have lower resolution and quality at non-standard dimensions
- Struggles with complex multi-object prompts and text generation
- Poor rendering of human hands, limbs, and faces due to training data limitations
- Trained primarily on English-language descriptions, reinforcing Western cultural bias
- Requires significant GPU computational resources for local deployment
Pricing, plan by plan
PaintTool SAI
5500/month- Standard License$5500/month
- Perpetual license
- All 1.x.x minor updates
- Free upgrade path to version 2
Stable Diffusion
FreeNo published plan breakdown. See the Stable Diffusion review.
Which should you pick?
Choose PaintTool SAI if
- You need pressure-sensitive tablet support.
- You work on windows.
- You also want anti-aliased brushes.
Choose Stable Diffusion if
- You need text-to-image.
- You want to start without paying.
- You work on Web, Local (GPU-based), Cloud APIs.
- You also want image-to-image.
Questions people ask
- Is PaintTool SAI or Stable Diffusion better?
- Neither clearly leads. PaintTool SAI starts at 5500/month and Stable Diffusion at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, PaintTool SAI or Stable Diffusion?
- Stable Diffusion has a free tier; the other does not. Paid plans start at 5500/month for PaintTool SAI and Free for Stable Diffusion.
- Does PaintTool SAI or Stable Diffusion run on more platforms?
- PaintTool SAI runs on windows. Stable Diffusion runs on Web, Local (GPU-based), Cloud APIs.
- Can I use Stable Diffusion for free?
- Yes. Stable Diffusion has a free tier, so you can try it without paying. PaintTool SAI starts at 5500/month.
- What is PaintTool SAI best used for?
- PaintTool SAI is most often used for digital illustration and manga art, line art and inking with pressure-sensitive pens, lightweight painting on lower-spec computers, character and concept art sketching. Of those, digital illustration and manga art and line art and inking with pressure-sensitive pens are not what Stable Diffusion is typically brought in for.
- What can PaintTool SAI do that Stable Diffusion cannot?
- PaintTool SAI covers Pressure-Sensitive Tablet Support, Anti-Aliased Brushes, 16-bit ARGB Color Channels, Lightweight Performance. Stable Diffusion covers Text-to-image, Image-to-image, Inpainting, LoRA support.
Answered from the vendors’ own pages
PaintTool SAI: Is there a free trial for PaintTool SAI?
Yes, PaintTool SAI offers a 31-day free trial with full functionality before requiring purchase of a license.
SourceStable Diffusion: Is Stable Diffusion truly free and open-source?
Yes. Stable Diffusion is released under the CreativeML Open RAIL-M license, allowing free use for both commercial and non-commercial purposes, and the code is open-source on GitHub.
SourcePaintTool SAI: What does the license cover?
The one-time 5,500 JPY purchase provides a perpetual license covering all minor updates within version 1.x.x; a major version 2 upgrade is offered for free.
SourceStable Diffusion: Can I use Stable Diffusion commercially for free?
Yes, if your organization has less than $1M annual revenue. Organizations exceeding $1M annually must obtain an Enterprise License from Stability AI.
SourcePaintTool SAI: What operating systems are supported?
PaintTool SAI runs on Windows XP through Windows 11, but only in 32-bit mode, requiring at least a 450MHz Pentium processor and 256MB of RAM.
SourceStable Diffusion: What are Stable Diffusion's image resolution limitations?
The base model was trained on 512x512 pixel images, and image quality degrades noticeably when deviating from this resolution. Newer models like SDXL support higher resolutions.
SourceStable Diffusion: Can I run Stable Diffusion locally on my computer?
Yes. Stable Diffusion is open-source and can run locally on compatible hardware, though it requires a GPU for reasonable performance.
SourceRelated pages
More on PaintTool SAI
More on Stable Diffusion
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- Stable Diffusion vs D-ID
- Stable Diffusion vs Fathom
- Stable Diffusion vs Perplexity
- Stable Diffusion vs Arize AI
- Stable Diffusion vs Black Forest Labs
- Stable Diffusion vs Cartesia
- Stable Diffusion vs Deepgram
- Stable Diffusion vs Helicone
- Stable Diffusion vs Ideogram
- Stable Diffusion vs Jasper
- Stable Diffusion vs PromptLayer
- Stable Diffusion vs Resemble AI
- Stable Diffusion vs Together AI
- Stable Diffusion vs AI21 Labs
- Stable Diffusion vs Copy.ai
- Stable Diffusion vs HeyGen

