Maro Writer: write long-form fiction with AI, on your terms
A macOS writing app for long-form and serialized fiction. The AI answers from your story's own record, and nothing joins the manuscript until you adopt it.
What is inside
Story memory
Chapter-by-chapter memory of what happened, so the AI answers from the story's own record instead of guessing.
Three co-writing modes
AI-led, writer-led, or writing together, chosen per work.
You adopt, then it joins
AI drafts become part of the manuscript only when you adopt them. The original is kept separately.
Genre tools
A built-in glossary of several hundred martial-arts terms, a name finder, and genre-specific themes.
A bookshelf for many works
Keep several works on one shelf, each with its own genre and theme.
Answers that show their sources
Ask about the manuscript through the Claude connection, and the answer comes back with the passages it relied on.
Three ways to write together
Pick a mode per work. Whatever the mode, AI drafts join the manuscript only when you adopt them.
AI-led
The AI drafts and you choose what to adopt.
Writer-led
You write, and the AI helps when you ask.
Together
You and the AI write the chapter side by side.
Start a work and write together
- Open the bookshelf, enter a title and genre for a new work, then create and open it.
- Pick a co-writing mode for the work: AI-led, writer-led, or writing together.
- Write chapter by chapter. Select a passage to ask for changes right there, compare, and apply.
- Adopt only what you like. Drafts join the manuscript when you adopt them; the original is kept separately.
- Use the genre tools. The glossary and name finder sit beside the manuscript.
Screens from the app
Real screenshots of Maro Writer on the Mac. The interface is in Korean.
What's on screen
On screen: the 무협 사전 (martial-arts dictionary) for 《이도》, showing 475개 용어 (475 terms) with tabs 모두 (All), 이도 사전 (Ido dictionary) and 무협 일반 (General). Entries include 강호(江湖), 무림(武林), 정파(正派), 사파(邪派), 협(俠) and 은원(恩怨), each with a 대화에 넣기 (Add to conversation) button. Above them is 초식 이름 짓기 (a technique-name finder), and the 《이도》 co-writing panel is on the right.
What's on screen
On screen: 《별의 서고》 1화 · 떨어지지 않는 별의 책 (Episode 1, “The Book of the Star That Did Not Fall”) on a night-sky theme, with 2,994 characters · 758 words · 59 paragraphs. Side tabs read 원고 (Manuscript), 대화 (Chat), 목차 (Contents), 설계 (Design), 세계 (World), 사전 (Dictionary) and 검토 (Review). The 《별의 서고》 공동 집필 (co-writing) panel shows the modes AI주도 (AI-led), 사용자주도 (writer-led) and 같이 (together).
What's on screen
On screen: the 작품 서가 (Bookshelf) with 내 작품 · 2작품 (My works, 2): 이도 (martial arts, last opened 2026-09-29 at 11:42 PM) and 별의 서고 (fantasy, last opened 2026-10-08 at 10:21 AM). On the right is a 새 작품 (New work) form with 제목 (Title), 장르 (Genre) and a 만들고 열기 (Create and open) button.
What's on screen
On screen: the Maro Writer window (maro-writer-v1) with the manuscript of 《이도》 1화 · 채우지 않는 자 (Episode 1, “The One Who Does Not Fill”), a count of 12,254 characters · 2,916 words · 397 paragraphs, and the note 원본은 별도로 보존됨 (Original kept separately). Mode buttons 설계 모드 (Design mode) and 집필 모드 (Writing mode) sit at the top. The right panel, 《이도》 공동 집필 (co-writing), answers a question about Episode 2 and shows 확인한 원고 근거 5곳 (5 manuscript passages checked).
On the shelf today
《이도》 · martial arts
A martial-arts novel, written with the genre glossary and name finder at hand.
《별의 서고》 · fantasy
A fantasy work co-written chapter by chapter at a night-sky desk.
System requirements
| Operating system | macOS |
|---|---|
| How it runs | Native macOS app |
| AI | Claude connection for co-writing |
| Interface language | Korean |
How it was made
- May 2026A question about starting a martial-arts novel grows into Maro Portal's writing extension.
- September 27, 2026Specified in a Claude Code session; all 309 regression checks pass.
- September 29, 2026Installed as its own macOS app.
Want to use Maro Portal or Maro Writer?
Tell us which app and what for. We reply by email.