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PaintTool SAI vs Spline

PaintTool SAI logo

PaintTool SAI

Software

Lightweight digital painting and illustration software for Windows

From
5500/month
Rated
-
Full reviewWebsite
Spline logo

Spline

Software

3D design tool for the web

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Spline 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.; Spline aI generation features produce inconsistent and often distorted results, failing at basic depth perception tasks
  • They diverge on capability: PaintTool SAI covers Pressure-Sensitive Tablet Support, Spline covers 3D modeling.

Where they differ

Only the attributes on which PaintTool SAI and Spline actually diverge.

Attributes where PaintTool SAI and Spline differ
AttributePaintTool SAISpline
Starting price5500/monthFree
Pricing modelone-timefreemium
Free tierNoYes
PlatformswindowsWeb, iOS, Android, visionOS
FoundedUnknown2020

Identical on both: user rating (Not yet rated), category (Unknown).

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 Spline

  • 3D modeling
  • Real-time collaboration
  • Animations
  • Interactions
  • Code export
  • React
  • Next.js
  • Webflow

What people use each for

The jobs each tool is most often brought in to do.

PaintTool SAI

  • Digital illustration and manga artnot Spline
  • Line art and inking with pressure-sensitive pensnot Spline
  • Lightweight painting on lower-spec computersnot Spline
  • Character and concept art sketchingnot Spline

Spline

  • Web 3D experiencesnot PaintTool SAI
  • Interactive prototypesnot PaintTool SAI
  • Product visualizationnot 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.

Spline

  • AI generation features produce inconsistent and often distorted results, failing at basic depth perception tasks
  • Limited to simpler designs - not suitable for high-poly, detailed production models
  • Performance degrades with complex scenes containing many objects and materials
  • Limited non-Apple platform coverage compared to cross-platform design tools
  • Tutorials are either too fast for beginners or too basic for advanced users

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

Spline

Free
  • FreeFree
    • Unlimited projects
    • Basic exports
    • Community support
  • Pro$9/month
    • Advanced exports
    • Custom domains
    • Password protection
  • Team$19/month
    • Team collaboration
    • Version control
    • Admin controls

Which should you pick?

Choose PaintTool SAI if

  • You need pressure-sensitive tablet support.
  • You work on windows.
  • You also want anti-aliased brushes.
PaintTool SAI review

Choose Spline if

  • You need 3d modeling.
  • You want to start without paying.
  • You work on Web, iOS, Android, visionOS.
  • You also want real-time collaboration.
Spline review

Questions people ask

Is PaintTool SAI or Spline better?
Neither clearly leads. PaintTool SAI starts at 5500/month and Spline at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PaintTool SAI or Spline?
Spline has a free tier; the other does not. Paid plans start at 5500/month for PaintTool SAI and Free for Spline.
Does PaintTool SAI or Spline run on more platforms?
PaintTool SAI runs on windows. Spline runs on Web, iOS, Android, visionOS.
Can I use Spline for free?
Yes. Spline 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 Spline is typically brought in for.
What can PaintTool SAI do that Spline cannot?
PaintTool SAI covers Pressure-Sensitive Tablet Support, Anti-Aliased Brushes, 16-bit ARGB Color Channels, Lightweight Performance. Spline covers 3D modeling, Real-time collaboration, Animations, Interactions.

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.

Source
Spline: What is Spline's pricing?

Spline offers a Free plan with watermarked web exports, Starter at $12/month (billed annually) removing watermarks, Professional at $20/month with unlimited projects, and Enterprise with custom pricing. Viewers are unlimited on all plans.

Source
PaintTool 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.

Source
Spline: Can Spline export 3D models to other tools?

Spline's export/import format support is more limited compared to traditional 3D tools like Blender. It focuses on web-first exports and native app code generation.

Source
PaintTool 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.

Source
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