CarbonStarfish

Carbon Starfish®

AI that assists.
People who decide.

We build focused, AI-assisted software for people who create and ship. Our products handle the remembering, organizing and checking. The imagination, the judgment and the final word stay with you.

Explore our products Our story

The makers of Carbon~Quill and RenderSift.

2AI-assisted products, each on its own domain
35+Years of combined software experience behind them
0Manuscripts used to train AI models
1Rule: people make the final call

Our products

Two tools. One conviction.

One helps novelists write. The other helps product teams catch visual defects. Both use AI to take on the work that wears people down, and both leave the decisions to you.

Carbon~Quill

Author Powered ● AI-Assisted
Writing platform for novelists

Where your story meets clarity.

Carbon~Quill is a complete writing studio for novelists. Organize your world, write without distraction, and let an AI that knows your story bible take care of the details, so you can focus on the story.

  • An AI writing partner that knows your characters, plot threads and voice
  • Story bible, timelines and relationship webs, all connected
  • Continuity tracking that catches inconsistencies before your readers do
  • AI cover studio and export to PDF, DOCX, EPUB and more
Explore Carbon~Quill Visit carbon-quill.com
carbon-quill.com
The Carbon~Quill editor, with a manuscript on the left and the AI assistant panel offering suggestions on the right.

RenderSift

AI visual QA
Private beta

Catch visual defects before your customers do.

Upload a collection of screenshots. RenderSift uses AI to rank layout, accessibility, copy and consistency issues by priority, and attaches reviewable evidence to each one. You don't need a visual-regression suite.

  • Findings ranked by severity and confidence, so you don't have to open every image
  • Each finding keeps its source image, affected region, explanation and suggested fix
  • Your team confirms, dismisses or annotates every finding. The AI never makes the final call
  • Portable Markdown, JSON and SARIF exports
Explore RenderSift Visit rendersift.com
rendersift.com · Checkout · 12 screenshots

What connects them

The AI assists. You make the call.

Every Carbon Starfish product starts from the same idea. AI is at its best on analytical work: remembering, organizing, checking and pointing things out. Decisions belong to the people who own the work.

Carbon~Quill

“AI is here to assist your vision, not replace it.”

RenderSift

“Findings are evidence for human review.”

Five arms, one center

The principles behind everything we ship.

I

People decide

AI suggests, highlights and organizes. Authors keep the final word, and reviewers record the final decision on every finding.

II

Your work stays yours

You own what you create. Export it anytime in portable formats, and leave whenever you like.

III

Private by design

Isolated workspaces and sandboxed AI context mean no one else's AI ever sees your work.

IV

Evidence, not a black box

Every suggestion comes with context you can inspect, so you can see why it was made, not just what it says.

V

Honest by default

No dark patterns, no hidden fees, and no data held hostage. We tell you what we do with your information, and we mean it.

Transparency

Everything public, one click away.

Each product publishes its own policies, security practices and help resources on its own domain. Here they are in one place.

All legal & policy documents

Carbon~Quill

RenderSift

Find the right tool for your work.

Writing a novel? Shipping an interface? There's a Carbon Starfish product built for it.

Carbon~Quill for writers RenderSift for product teams