Maps, bibles, and canon

Plotting and worldbuilding

Outlines, codexes, lorebooks, and structure reports. Some of these write. Some only read the manuscript and hand back a map. Plottr itself is not here: that app deliberately ships without AI. Storysnap, from the same team, is.

11 tools

• A

  Editing

  AutoCrit

  Fiction editing reports for dialogue, pacing, repetition, and overused phrasing, plus a story analyzer and an AI reader you can steer with instructions. The reports compare your draft with genre tendencies, which is a clue, not a verdict. It will not write the book for you.

  Best for Novelists who want genre-aware notes on a complete draft, not a chatbot that continues the scene.

  SubscriptionFiction
• F

  Editing

  Fictionary

  Story-structure software that visualizes a story arc and includes Edwina, an AI instructor for scene-level feedback. The useful part is seeing whether the draft has a shape. The classes, if you buy them, are people. Do not confuse the two.

  Best for Novelists who want structure feedback while outlining and revising, with an optional human class on the side.

  SubscriptionFiction
• L

  Drafting

  LivingWriter

  A manuscript workspace for books and screenplays: boards for structure and elements, outlines, and export to DOCX, PDF, EPUB, and Kindle. Optional AI can chat with the draft, rewrite, analyze, outline, convert a chapter to a screenplay, or sketch a cover, and the vendor says your manuscript is not used to train models. Free and Pro cap those requests hard, and this is still a general writing desk rather than a fiction-tuned co-writer like Sudowrite.

  Best for Authors who want planning boards, a manuscript, and optional AI in one app, including screenwriters.

  FreemiumFiction and nonfiction
• L

  Drafting

  Loreon

  A novel continuity studio: a structured story bible, canon links as you type, and specialist checks for contradictions, voice, and dropped foreshadowing, including across volumes of a series. You can write every word and only run the checks. Agent work spends credits, and the product is new enough that you should test the depth on your own manuscript before you trust it.

  Best for Series and long-form fiction writers whose continuity problem is bigger than a chat window.

  Usage-basedFiction
• M

  Editing

  Marlowe

  Analytical feedback on plot, pacing, character, and how a draft compares with patterns in commercial fiction. Marlowe does not rewrite your sentences. That restraint is the product: a developmental read in minutes, with the usual risk that a statistical 'beat' is not what your book is doing.

  Best for Fiction writers who want a fast developmental read and do not want the tool to touch the prose.

  Usage-basedFiction
• N

  Drafting

  NovelAI

  A story model with a lorebook, memory, and author's notes, built for long fiction rather than office prose. It is less filtered than ChatGPT or Claude, which some genres need and some writers will not want. The interface feels closer to a text adventure console than a manuscript editor.

  Best for Fiction writers who care about a dedicated story model and persistent lore more than a guided editorial workflow.

  SubscriptionFiction
• N

  Drafting

  Novelcrafter

  A novel workspace with a codex for characters, places, and canon, plus chat and drafting that can call many outside models. You are in charge of how much AI shows up, including none. The tradeoff is setup: keys, prompts, and model choice are your problem.

  Best for Series authors who want a codex and the freedom to pick the model, including one running on their own machine.

  SubscriptionFiction
• P

  Drafting

  ProseEngine

  A fiction studio for drafting and revising a novel in one project: inline rewrites, a story codex, continuity checks, and scene scoring. You can bring an API key or use prepaid credits. The free plan is narrow, and a score is not the same thing as taste.

  Best for Fiction writers who want continuity checks and rewrite tools on their own manuscript, not a general-purpose chatbot.

  FreemiumFiction
• S

  Drafting

  Squibler

  An outlining and drafting app that will try to expand a premise into chapters or a screenplay. Speed is the point, and it shows: structure comes out fast, sentences come out generic, and you should expect to rewrite. Handy as a project container if you already know the story.

  Best for Writers who want a structured project and a fast first pass they are willing to throw away in revision.

  SubscriptionFiction and nonfiction
• S

  Plotting and worldbuilding

  Storysnap

  From the team behind Plottr, and deliberately separate from it. Plottr the outlining app has no AI. Storysnap uploads a Word or PDF manuscript and returns a visual outline, character and world notes, and a Plottr file. Expect missed details and the occasional invented emphasis. It reads; it does not write the next chapter.

  Best for Writers who already think in Plottr and want a first-pass story bible pulled out of a finished draft.

  Usage-basedFiction
• S

  Drafting

  Sudowrite

  A fiction workspace rather than a blank chat. Sudowrite keeps a story bible and offers brainstorming, description, continuation, and rewrite tools aimed at novels and screenplays. Credits run out, and the prose still needs a human pass for plot decisions and voice.

  Best for Novelists who want fiction-specific drafting tools inside the manuscript, with usage included in the subscription.

  SubscriptionFiction