Persistent AI Characters with Memory and Continuity

Persistent AI Characters with Memory and Continuity

Live: Public Testing

Build persistent AI characters with memory, beliefs, relationships, and visible growth over time.

LivingNPC Engine helps writers, world builders, and tabletop creators create characters once, run structured simulations, review what changed, and return later to see continuity.

Launch offer: Creator tier is 50% off for the first 3 months after launch.

Regular price: $9.99/month
Launch price: $4.99/month for 3 months
Free start: 1 week before billing begins

Live: Public Testing

LivingNPC Engine is live for open public testing.

Start with a free week, create your first project, build test characters, and run simulations before billing begins.

During the free week, you can:

• Build up to 3 characters
• Maintain 1 project
• Run 25 simulations

After the free week, the Creator tier begins unless cancelled.

Creator tier launch offer: $4.99/month for the first 3 months, then $9.99/month.

LivingNPC Engine is currently live in public testing. Bugs, rough edges, and occasional issues are expected while the app is being tested and improved.

If you run into a problem, please email admin@livingnpc-engine.com with a short description of what happened, what page you were on, and any error message you saw. We will update this notice once a Reporting Mechanism is in place within the app.

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Most AI Characters Don’t Actually Grow

Most AI characters are forgetful, inconsistent, and static. They may generate dialogue, but they do not preserve meaningful memory, relationship history, or stable personality over time. LivingNPC Engine is built to solve that problem.

Instead of acting like disposable prompt outputs, characters in LivingNPC Engine are designed to persist. They can carry forward memories, beliefs, and relationship changes across repeated interactions so creators can come back later and still feel continuity. 

LivingNPC Engine is now live for public testing, letting creators try the core loop directly: create a character, run a simulation, review the result, and return later to see whether that character feels meaningfully changed.

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How It Works

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Creator Tier Launch Offer

Open public testing is Live.

The Creator tier is built for writers, world builders, and tabletop creators who want to test persistent character continuity across multiple projects and scenarios.

Creator Tier

Regular price: $9.99/month
Launch price: $4.99/month for the first 3 months
Free start: 1 week before billing begins

Included in Creator Tier

• 50 characters
• 10 projects
• 250 simulations per month

Free Week Access

Before billing starts, you can try the core product loop with:

• 3 characters
• 1 project
• 25 simulations

Use the free week to create a project, build characters, run simulations, and decide whether LivingNPC Engine fits your workflow.

The 50% launch offer is available for early public testing signups.

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Core Features

Why Persistent AI Characters Feel Different

Persistent Memory

Characters remember past events and carry that context forward into future simulations. 

Relationship Evolution

Trust, fear, respect, and other social dynamics can shift over time through simulation and writeback flow.   

Belief-Driven Behavior

Characters are designed around stable internal state, including beliefs, values, and personality, not just raw prompt improvisation.   

Structured Simulations

Run structured single-character and two-character scenes with transcript, summary, and tracked state changes.   

Creator Control

Review, approve, reject, and apply writebacks so canon changes stay visible and intentional.   

Growth Over Time

The goal is simple: create characters once, simulate them repeatedly, and come back later to find they have evolved. 

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Persistent AI Characters for Creators

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What LivingNPC Makes Possible

• A guild captain whose trust in a reckless rogue changes after one bad decision too many
• A scholar who remembers a prior warning and reacts differently the next time danger appears
• A two-character scene where dialogue, beliefs, and relationships evolve together
• A persistent cast you can return to across multiple scenarios without starting from scratch
• A creator workflow where character growth becomes visible, reviewable, and reusable over time

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What Comes Next

Open public testing focuses on the core creator loop: persistent characters, structured simulations, reviewable changes, and visible continuity.

After launch, planned improvements include:

Single Character Chat

A dedicated chat mode for interacting with one character directly outside the formal simulation flow.

Expanded Character Personality, History, and Emotional Intelligence

Deeper character state so responses can better reflect personality, prior history, emotional context, and relationship patterns.

Enhanced Memory

Improved memory handling so characters can carry more useful context across repeated interactions and longer creative workflows.

LivingNPC Engine will continue expanding over time, but the first priority is making persistent character creation and simulation clear, useful, and reliable for creators.

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Join Open Public Testing

Public testing is now live.

Try LivingNPC Engine with a 1-week free start. Build characters, run simulations, review changes, and test whether persistent AI characters fit your creative workflow.

Launch Offer

Creator tier is 50% off for the first 3 months after launch.

• Regular price: $9.99/month
• Launch price: $4.99/month for 3 months
• Free week before billing begins

Free Week Includes

• 3 characters
• 1 project
• 25 simulations

Creator Tier Includes

• 50 characters
• 10 projects
• 250 simulations per month