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BunCho

Free AI tools

창작자를 위한 무료 AI 스토리 · 만화 기획 도구

회원가입 없이 바로 사용할 수 있는 무료 AI 제목·플롯·캐릭터 생성기와 장르별 스토리 템플릿입니다.

Generators that write in English

Foreshadowing Checker

Paste your manuscript and a list of setups (or mark them [setup: key] / [payoff: key]) to see where each one was planted, where it paid off, and which are still open. Free, no sign-up.

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Plot Hole & Continuity Checker

Paste your manuscript to find conflicting ages, hair and eye colors, characters who speak after they died, and misspelled names — each with a quote and line number. Free, no sign-up.

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Script Length Calculator

Paste a Fountain or “Name: line” script and get an estimated runtime per scene two ways: page count (1 page ≈ 1 minute) and reading speed. Free, no sign-up.

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Fountain Editor Online

Write in Fountain and see a formatted screenplay preview as you type. Autosaves in this browser; export .fountain or FDX, or print to PDF. Free, no sign-up.

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Story ideas by trope

Plot templates by trope

Original Japanese tools

Japanese originals: The two tools below the generators are BunCho's original Japanese pages. They write in Japanese and are handy for translators and learners.

AI title generator

Enter a genre and a few keywords, and the AI proposes title ideas for a novel, manga or video. It's tuned on Japanese web fiction, so it is especially good at the long, descriptive titles common in light novels and isekai.

How to use it

  1. Choose a genre.
  2. Type a few keywords in Japanese (for example 婚約破棄 for "broken engagement" or 辺境 for "frontier").
  3. Generate, then keep the titles you like and run again for more.

Tips

  • Mix one rising trope from our weekly trend report with one unexpected word.
  • Translators and learners can use it to see how Japanese titles are typically built.
  • Generate several rounds and combine halves of different titles.

Open the title generator (Japanese)

AI synopsis generator

Give it keywords or a title and the AI drafts a synopsis — the short pitch readers see before they click. You can then keep writing the story together with the AI in the relay novel tool.

How to use it

  1. Enter keywords or your working title in Japanese.
  2. Generate a synopsis.
  3. Edit it by hand, or continue the story in the AI relay novel.

Tips

  • Use the synopsis as a test: if it sounds generic, your premise may need a sharper hook.
  • Try the same keywords with a different genre to explore tones.

Open the synopsis generator (Japanese)

Questions

Are the tools really free?
Yes. All the generators on this page are free, with a daily limit so they stay free for everyone. The long-form BunCho Studio is a paid plan with a 7-day free trial.
Do they write in English?
Yes. The four generators at the top write in English. The two original Japanese tools further down write in Japanese, which is handy for translators and learners.
Who owns what I generate?
You are free to use what you generate in your own work. Please check the Terms of Use (in Japanese) for details.

See which words are trending in Japanese titles this week →