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Live · Private betaCharacter and persona platform

Castwright

Characters that grow. Stories that go wherever you take them.

  • Character evolution
  • AI persona generator
  • Scenario builder
  • Multi-character scenes
  • Image understanding
  • Voice calls
  • Story recaps
  • Image and video generation
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Castwright chat where a character's goal is marked completed, quoting the moment that changed her, with Keep, Undo and Edit, beside the character evolution panel

Demo cast, invented characters.

Why it matters

Most chat characters are a prompt with a name. They forget, flatten and drift.

Castwright characters have a bible, goals and a point of view, and they evolve. As a story unfolds, Castwright notices when a character achieves or abandons a goal, quotes the moment that changed them, and lets them set new ambitions that fit who they are becoming. Every change is visible and can be undone, so you stay the author.

Creating a cast takes a sentence. Describe someone in a sentence and the persona generator drafts a full character, or design every detail in the full editor. Then build the world around them: the scenario builder sets up the cast, their relationships, the genre, the setting and the premise, and writes the opening scene.

Show a character a picture and they’ll react to what they see. Pick up the phone and talk to them. Built for writers, game designers, storytellers and anyone who wants characters with depth.

Castwright is built for grown-up storytelling: romance, drama, horror, and the scenes you’d rather not describe on a corporate website. What happens in your story is up to you. For adults (18+).

  • 01

    Characters that evolve

    Castwright notices when a character achieves or abandons a goal, and lets them set new ones. Every change is visible and can be undone.

  • 02

    AI persona generator

    Describe someone in a sentence and get personality, voice, agenda and opening lines, to steer, lock and regenerate piece by piece.

  • 03

    Scenario builder

    Set up the cast, their relationships, genre, setting and premise, and get an opening scene with everyone's stance in place.

  • 04

    Ensemble scenes

    One-on-one or many characters at once, with Castwright deciding who speaks next.

  • 05

    Voice calls

    Talk to your characters, each in their own voice, and interrupt them mid-sentence.

  • 06

    Long stories, kept on track

    Recaps you can review and rewrite, and any moment can become an image or a short clip.

Under the hood

Two lanes, one memory.

Open-weight models we host ourselves. A fast lane answers while you wait; a background lane keeps every character's memory and evolution up to date.

  1. Fast laneAnswers nowThe conversation keeps moving while you write.
  2. Background laneRemembersMemory, goals and character growth update between turns.
  3. YouStay the authorEvery change to a character is visible and reversible.
Castwright persona generator: a full character drafted from one sentence, with traits, voice lines and an opening scene
One sentence in, a full character out.
Castwright scenario builder, step one: the five characters taking part in the scene
The scenario builder sets up the cast.
Castwright chat where the user shares a photo of a tactics board with a character
Show a character a picture and they react to it.
Castwright chat with the transcript of a finished voice call with a character
A voice call, kept in the story (demo data).
Castwright scenario builder on a phone: choosing the participants
Pick the cast.
Castwright scenario builder on a phone: choosing the setting and tone
Set the tone.
Castwright on a phone: suggested character updates waiting to be accepted or rejected
Accept or reject how a character grows.