Sudowrite alternative for writing character scenes
Let your characters play the scene before you write it, then turn it into prose in one click.
Time loop
A train station on the same Friday afternoon — for the fourth time. Only one of them remembers the loop.
In shortCastfic is a Sudowrite alternative for character scenes: your characters act it out, each played separately with its own secret, then one click rewrites it as prose or a screenplay and saves a memory to each card. It is not a novel editor. 1 free scene without an account, then 1 a day with Google sign-in.
How to draft a scene in Castfic instead of writing it blind
- Describe two or three characters: voice, motive and one secret each.
- Choose a scene, such as a time loop, and add a note about where it should end.
- Watch the scene play, then redo any round that goes the wrong way.
- Rewrite as prose in a style you like, then edit it in your own tool.
How they differ
| Castfic | Sudowrite | |
|---|---|---|
| Starting point | A scene with characters | A blank page or a story bible |
| Who does the first draft | The characters, line by line | The AI continues your text |
| Best for | Dialogue-heavy scenes and trope fic | Novel-length drafting and editing |
| Free use | 1 free scene without an account, then 1 a day with Google sign-in | Free trial, no card |
| Entry price | $4.99 for 15 scenes, or $7.99/mo | $10/mo |
Sudowrite is the better pick for a full manuscript with chapters and a story bible. Castfic is for finding out what your characters would do.
A scene from a time loop
Dr. Hollis Vane has relived the same lab accident eleven times. Juno is the intern who only remembers it once. Hollis's secret is that he caused the accident.
| Character | Line |
|---|---|
| Hollis | "Don't touch the blue valve. I can't tell you why. I can tell you it's blue." |
| Juno | "You've said that to me before. Haven't you?" |
| Hollis | "Eleven times. The valve gets less interesting each time." |
Juno cannot know about the loop; she is just sharp. In a real scene, Hollis would only admit the cause once the director pushes toward the ending beat. (Illustrative lines.)
What a rewrite looks like
The prose rewrite is about 1,500 words, written in third person, in sweet, angst, comedy or AO3 style, and avoids a list of clichés. You can redo a rewrite, then edit it wherever you like.
How Castfic compares
| Castfic | Sudowrite | NovelAI | Type.ai | ChatGPT | |
|---|---|---|---|---|---|
| Free tier | 1 free scene without an account, then 1 a day with Google sign-in, plus a free Daily Scene | Free trial, no card; no ongoing free plan | Free trial: 50 text generations | Free plan with limited credits | Free plan with usage limits |
| Cheapest paid plan | $4.99 for 15 scenes, or $7.99/mo | $10/mo | $10/mo, unlimited text | $8/mo billed yearly | $20/mo (Plus) |
| Characters keep separate secrets | Yes, each is played separately | — | — | — | — |
| Scene to prose or screenplay | One click: prose or Fountain, 4 styles | Prose | Prose | Prose | Prose if you ask |
| OC memory across sessions | Written back to each character card | Story Bible | Lorebook | — | — |
| All-ages by design | Yes, 13+ with filters on | — | — | — | — |
Competitor details are from each product's public pages in October 2026 and may change. Product names are trademarks of their owners; Castfic is not affiliated with them.
Frequently asked questions
Is Castfic cheaper than Sudowrite?
It is cheaper to start: $4.99 for 15 scenes with no subscription, or $7.99/month, against Sudowrite's $10/month entry plan. They do different jobs, so compare what you need.
Can Castfic write a whole novel?
No. It makes one scene at a time. Use it for the scenes where dialogue and character conflict matter.
Does it have a story bible?
Character cards with a memory written back after every scene, and a relationship map. It is lighter than a full story bible.
Can I export to Word?
Yes. Word, Markdown and Fountain.
Is the output all-ages?
Yes. Castfic filters input and output and stops at a confession or a kiss between adults.
Try it with your own characters
1 free scene without an account, then 1 free scene a day after signing in with Google, plus the free Daily Scene.
Try a scene free