THE CHARACTER
ENGINE
Persistent memory, evolving personality, and proactive behavior for any foundation model. Bring your own LLM — we make it remember, feel, and act.
Works with OpenAI · Anthropic · Google · Mistral · Any OpenAI-compatible API
EVERY AI CHARACTER
FEELS THE SAME
Amnesia
Characters reset every session. Users repeat themselves. No relationship can form when memory is wiped clean.
Flat personality
Same tone, same responses, same "I'm just an AI" deflections. Personality is a system prompt, not a living model.
Purely reactive
Characters only speak when spoken to. Real relationships require someone who reaches out, checks in, and initiates.
AN ENGINE THAT MAKES
ANY LLM BELIEVABLE
The Character Engine wraps any foundation model with 7 parallel context layers — persistent memory, evolving personality, emotional modeling, relationship tracking, and autonomous behavior. Your LLM handles language. We handle everything that makes a character feel alive.
BRING YOUR OWN MODEL
The Character Engine is model-agnostic. Swap providers without rewriting your character logic. Same personality, same memories, different brain.
OpenAI
GPT-4o, GPT-4.1
Anthropic
Claude 4.5 Sonnet, Haiku
Gemini 2.5 Pro, Flash
Mistral
Large, Medium
Open Source
Llama, Qwen, DeepSeek
Any OpenAI-compatible API works out of the box. Self-hosted models supported via vLLM, Ollama, or TGI.
PRODUCTION PERFORMANCE
Battle-tested in production powering Pocket Souls.
PLATFORM CAPABILITIES
Six production-grade capabilities engineered for scale. Each one is battle-tested across millions of conversations in Pocket Souls.
Persistent Memory
Characters remember every interaction across sessions, building genuine long-term relationships. No context window limits — memories persist indefinitely.
Emotional Modeling
Real-time emotional state tracking across 48 dimensions. Characters respond with contextually appropriate emotion — not canned sentiment labels.
Adaptive Personality
Each character has a unique personality defined by Big Five traits plus custom dimensions. Personality shapes every response, not just tone — it shapes decisions.
Proactive Behavior
Characters don't wait to be spoken to. They initiate conversations, check in, and take action based on context and relationship state.
Sub-200ms Retrieval
Reasoning-based memory retrieval returns full 7-layer context in under 200ms at the 95th percentile. No perceptible delay, even with years of conversation history.
7-Layer Context Engine
Identity, personality, emotional state, relationship history, conversation context, world knowledge, and active goals — processed in parallel for every response.
BUILT FOR
Gaming NPCs
Characters that remember every playthrough
NPCs with persistent memory and evolving relationships. They remember player choices across sessions, develop opinions, hold grudges, and form alliances. Every playthrough becomes unique because the characters actually learn.
Persistent state across sessions | Autonomous decision-making | Emotional reactions to player actions
AI Companions
Relationships that deepen over months
AI friends, coaches, and mentors that develop genuine long-term bonds. They check in proactively, remember what matters, adapt their personality to each user, and never reset.
Proactive outreach | Personality evolution | Relationship modeling up to 10,000 bond score
POCKET SOULS
Our flagship consumer product. AI companions that remember you, check in on you, and grow alongside your journey. Every Soul is powered by the Character Engine — proof that the technology creates characters people genuinely connect with.
Live on iOS & Android · Sub-200ms context retrieval · 7-layer memory per user
Visit Pocket Souls
DEPLOY ANYWHERE
Native platform adapters with unified state management. Characters maintain consistent personality and memory across every channel.
Mobile Apps
iOS and Android via REST API with SSE streaming for real-time character responses
Game Engines
Unity and Unreal integration for NPC dialogue, quest systems, and dynamic storytelling
Messaging
Telegram, WhatsApp, Discord bots with rich interactions and group support
REST API
Full programmatic access. OpenAI-compatible streaming format for easy integration
READY TO BUILD?
Tell us about your project and we'll help you find the right setup for your AI characters.