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Software · head to head

AI21 Labs vs PaintTool SAI

AI21 Labs logo

AI21 Labs

Software

Enterprise language AI solutions

From
Free
Rated
-
Full reviewWebsite
PaintTool SAI logo

PaintTool SAI

Software

Lightweight digital painting and illustration software for Windows

From
5500/month
Rated
-
Full reviewWebsite

The short version

  • Only AI21 Labs has a free tier, so it costs nothing to try first.
  • Each has a real cost: AI21 Labs the free allowance is $10 of credit lasting 7 days rather than an ongoing free tier; PaintTool SAI windows-only software with no native Mac or Linux version.
  • They diverge on capability: AI21 Labs covers Jamba models, PaintTool SAI covers Pressure-Sensitive Tablet Support.

Where they differ

Only the attributes on which AI21 Labs and PaintTool SAI actually diverge.

Attributes where AI21 Labs and PaintTool SAI differ
AttributeAI21 LabsPaintTool SAI
Starting priceFree5500/month
Pricing modelusage-basedone-time
Free tierYesNo
PlatformsApi, Cloudwindows
Founded2017Unknown

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 AI21 Labs

  • Jamba models
  • Long context
  • RAG engine
  • Writing tools
  • REST API
  • Amazon Bedrock
  • Cloud platforms
  • Api support

Only in PaintTool SAI

  • Pressure-Sensitive Tablet Support
  • Anti-Aliased Brushes
  • 16-bit ARGB Color Channels
  • Lightweight Performance
  • Crash Data Protection

What people use each for

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

AI21 Labs

  • Running long-context tasks on the Jamba model familynot PaintTool SAI
  • Building and optimising production AI agents with Maestronot PaintTool SAI
  • Routing between models to control cost and accuracynot PaintTool SAI
  • Long-horizon agentic tasks needing stateful workspacesnot PaintTool SAI

PaintTool SAI

  • Digital illustration and manga artnot AI21 Labs
  • Line art and inking with pressure-sensitive pensnot AI21 Labs
  • Lightweight painting on lower-spec computersnot AI21 Labs
  • Character and concept art sketchingnot AI21 Labs

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

AI21 Labs

  • The free allowance is $10 of credit lasting 7 days rather than an ongoing free tier
  • Jamba Large is $2 per million input tokens and $8 per million output, so output-heavy work costs four times as much as input
  • Volume discounts, private cloud hosting and higher rate limits require a custom plan
  • Standard rate limits are not published

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.

Pricing, plan by plan

AI21 Labs

Free
  • Free TrialFree
    • Limited usage
    • API access
  • Jamba$0.2/per-million-input-tokens
    • 256K context
    • Hybrid architecture

PaintTool SAI

5500/month
  • Standard License$5500/month
    • Perpetual license
    • All 1.x.x minor updates
    • Free upgrade path to version 2

Which should you pick?

Choose AI21 Labs if

  • You need jamba models.
  • You want to start without paying.
  • You work on Api, Cloud.
  • You also want long context.
AI21 Labs review

Choose PaintTool SAI if

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

Questions people ask

Is AI21 Labs or PaintTool SAI better?
Neither clearly leads. AI21 Labs starts at Free and PaintTool SAI at 5500/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, AI21 Labs or PaintTool SAI?
AI21 Labs has a free tier; the other does not. Paid plans start at Free for AI21 Labs and 5500/month for PaintTool SAI.
Does AI21 Labs or PaintTool SAI run on more platforms?
AI21 Labs runs on Api, Cloud. PaintTool SAI runs on windows.
Can I use AI21 Labs for free?
Yes. AI21 Labs has a free tier, so you can try it without paying. PaintTool SAI starts at 5500/month.
What is AI21 Labs best used for?
AI21 Labs is most often used for running long-context tasks on the jamba model family, building and optimising production ai agents with maestro, routing between models to control cost and accuracy, long-horizon agentic tasks needing stateful workspaces. Of those, running long-context tasks on the jamba model family and building and optimising production ai agents with maestro are not what PaintTool SAI is typically brought in for.
What can AI21 Labs do that PaintTool SAI cannot?
AI21 Labs covers Jamba models, Long context, RAG engine, Writing tools. PaintTool SAI covers Pressure-Sensitive Tablet Support, Anti-Aliased Brushes, 16-bit ARGB Color Channels, Lightweight Performance.

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
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
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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