sepia
sepia is a skill that removes AI-sounding patterns from fiction and professional writing for writers and marketers who want text that reads as human.
What it is good for
- Repairing story structure that makes fiction read as AI-written
- Rewriting release notes, postmortems, and tickets so they sound human
- Reviewing a draft for AI tells without changing the text
- Matching writing style to the venue, such as a blog or a support reply
At a glance
- Who it is for
- Setup
- Adds to an AI app you already use
Level 2 of 5. Connects to Claude, ChatGPT, or a similar app you already have, usually through a settings screen.
- Cost
- Free and open source
- Type
- Skill or plugin
- Tasks
- Works with
- Claude Code, Codex, Grok Build, Antigravity, QwenPaw
Momentum
- Rank this week
- Not ranked yet
- Best rank
- None yet
- GitHub stars
- 3,579
GitHub numbers as of Nov 2, 2026. Updated weekly.
Official links
Setup steps are on the official pages. We do not repeat them here, since they change.
Questions
- Is sepia free?
- Yes. It is free and open source (MIT license).
- Do I need to know how to code to use sepia?
- No. Connects to Claude, ChatGPT, or a similar app you already have, usually through a settings screen.
- What does sepia work with?
- According to its own documentation, it works with Claude Code, Codex, Grok Build, Antigravity, and QwenPaw.
- What is sepia good for?
- Repairing story structure that makes fiction read as AI-written, rewriting release notes, postmortems, and tickets so they sound human, reviewing a draft for AI tells without changing the text, and matching writing style to the venue, such as a blog or a support reply.
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