Bunsho
Novel-writing software that detects continuity errors, plot holes, and story inconsistencies.
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Bunsho is novel-writing software for macOS and Windows that combines a manuscript editor with a continuity engine. It tracks characters, timelines, locations, objects, events, and world rules from the writer's prose, then identifies continuity errors, contradictions, timeline problems, and potential plot holes. Bunsho also includes World, Planner, Continuity, and Director Mode features to help writers organize stories, plan chapters, check character knowledge, and draft directed scenes while preserving author control.
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- Integrated manuscript editor with binder, page, and story views
- Continuity checker for characters, timelines, world rules, scenes, and objects
- Plot-hole and contradiction detection with both source passages shown
- Connected story model built automatically from the writer's prose
- World view for characters, places, objects, and story rules
- Planner for organizing chapter cards and scene goals
- Director Mode for planning and drafting character-directed scenes
- Preflight checks against character knowledge and established story facts
- Impact mapping that shows which scenes and callbacks are affected by a change
- Desktop apps for macOS and Windows
- Local-first manuscript workflow with import and export support
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Download Bunsho for macOS or Windows and begin writing in the integrated editor without creating an account. As you write, Bunsho builds a connected model of your characters, locations, events, objects, timelines, and world rules. Open World to review story elements, Planner to organize chapter goals, or Continuity to run checks and compare conflicting passages. Sign in when you want to use AI features such as continuity checking and Director Mode. In Director Mode, tag characters, describe the next scene, review the preflight warnings and beat sheet, then accept, re-render, or discard generated prose.
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- Check a novel for inconsistent character ages, timelines, or backstory details before publication
- Track world-building rules, locations, objects, and character knowledge in a fantasy or science-fiction series
- Plan chapters and directed scenes while ensuring characters act consistently with what they already know
- Identify which scenes and callbacks need review after changing an established story fact
- Draft long-form fiction without manually maintaining spreadsheets or separate story-bible documents
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