LCharacter draft
Luna
Thoughtful, observant, and quietly curious.
AI character development workspace
Build characters. Test how they behave.
CharFab gives character creators, writers, and AI developers one private BYOK workspace to define personalities, rehearse scenes, and refine character behavior through conversation.
Free during beta · Bring your own model API · Designed for character testing
Test run · private
“You remembered. I was hoping we could pick up where we left off.”
ATest persona
Alex
The version of you this story meets.
A focused creator workflow
Move from a character idea to a tested performance.
Keep the definition, test conditions, model setup, and resulting conversations together without adopting a heavyweight production system.
Define the character
Shape identity, motivation, personality, behavior, speaking style, voice, and visual direction in one compact profile.
Set the test context
Combine reusable Personas and scenes with any character to probe how it behaves with different people and situations.
Run independent rehearsals
Start multiple conversations with the same setup. Each run stays an independent story line, so experiments do not overwrite one another.
Bring your own models
Connect supported providers and choose separate language models for text chat, low-latency voice, and summaries.
Test text and voice
Review written responses, listen to individual replies, or rehearse with an automatic half-duplex voice call.
Keep work private
Each account receives an isolated workspace. Provider keys are encrypted by the server and are never returned to the browser.
How it works
From first draft to first test run.
A short guided setup gets the infrastructure out of the way so you can focus on defining, observing, and refining the character.
Connect a provider
Add your own provider key and model ID. CharFab validates the connection before enabling it for a test run.
Define the test
Describe the character, choose the Persona they will meet, and add a reusable scene when the situation matters.
Rehearse and refine
Run a private conversation, observe the character’s choices and voice, then revise the profile or start another independent run.
Free during beta
Bring a model. Build a character. Start testing.
CharFab does not charge during the beta and does not require a payment method. Future creator plans may offer expanded project storage, managed backups, and API access; features, prices, and currencies have not been announced.