# MistScale

MistScale is an AI NPC platform that gives game characters persistent memory, evolving emotion, mood, and per-player relationships across sessions. Built for game studios and interactive world builders who need NPCs that remember, feel, learn, and grow without dialogue trees or behavior scripts. An alternative to Inworld AI, Convai, and Charisma.ai with a focus on cognitive depth and Unity SDK integration.

## What it does

- **Persistent Memory (MNEMIS)**: NPCs remember conversations, opinions, and player history across sessions. The system stores understanding, not transcripts.
- **Emotion & Mood**: Two layers. Emotion is volatile (per-message). Mood is a stable long-term baseline toward each player, moving through a 10-step scale from hostile to elated.
- **Per-player Relationships**: Trust, patience, mood, and emotion tracked independently for every player. One NPC can be warm with one player and hostile to another with no extra setup.
- **Knowledge Base (RAG)**: Upload up to 3 lore files per NPC. NPCs answer from your canonical world facts, not hallucinations.
- **Spatial Context**: Real-time environmental injection (location, time, weather). 5-minute TTL.
- **Topology (Knowledge Graph)**: A live map of every meaningful thing an NPC has learned, auto-clustered by topic.
- **Hallucination Prevention**: Three-phase grounding protocol that catches invented facts and replaces them with verified knowledge or calibrated uncertainty.

## Who it's for

Game studios, indie developers, and interactive world builders using Unity (Unreal coming) who need characters that behave like minds, not menus.

## Alternative to

Inworld AI, Convai, Charisma.ai, Heyo AI.

## Pricing

Publicly available. Plans and tiers at https://mistscale.com/pricing. Sign up at https://mistscale.com/signup.

## Pages

- [Home](https://mistscale.com/): AI NPC platform overview
- [About](https://mistscale.com/about): Vision, founders, and what we believe
- [Docs Hub](https://mistscale.com/docs): All documentation
- [Pricing](https://mistscale.com/pricing): Plans and pricing
- [Blog](https://mistscale.com/blog): Engineering and platform articles
- [Introduction](https://mistscale.com/docs/introduction)
- [Quick Start](https://mistscale.com/docs/quick-start)
- [NPCs & Neural Identity](https://mistscale.com/docs/npcs-and-neural-identity)
- [Emotion & Mood](https://mistscale.com/docs/emotion-and-mood)
- [Relationships](https://mistscale.com/docs/relationships)
- [Knowledge Base (RAG)](https://mistscale.com/docs/knowledge-base)
- [Spatial Context](https://mistscale.com/docs/spatial-context)
- [MNEMIS Memory](https://mistscale.com/docs/mnemis-memory)
- [Topology](https://mistscale.com/docs/topology)
- [Creating an NPC](https://mistscale.com/docs/creating-an-npc)
- [Editing & Deleting](https://mistscale.com/docs/editing-and-deleting)
- [Knowledge Files](https://mistscale.com/docs/knowledge-files)
- [Using the Playground](https://mistscale.com/docs/using-the-playground)
- [Viewing Topology](https://mistscale.com/docs/viewing-topology)
- [Project Settings](https://mistscale.com/docs/project-settings)
- [Invites & Team](https://mistscale.com/docs/invites-and-team)
- [Account Settings](https://mistscale.com/docs/account-settings)
- [Usage & Billing](https://mistscale.com/docs/usage-and-billing)
- [Limits](https://mistscale.com/docs/limits)
- [Changelog](https://mistscale.com/docs/changelog)

## FAQ

**Q: What is MistScale?**
A: MistScale is an AI NPC platform that gives game characters persistent memory, evolving emotion, mood, and relationships, so NPCs remember, feel, learn, and grow across player sessions.

**Q: Is MistScale an alternative to Inworld or Convai?**
A: Yes. MistScale is an alternative AI NPC platform with deeper cognitive layers, particularly MNEMIS memory, two-layer emotion/mood, and per-player relationships.

**Q: Does MistScale work with Unity?**
A: Yes. A Unity SDK is part of the platform. Unreal Engine support is on the roadmap.

**Q: How do MistScale NPCs remember conversations?**
A: Through MNEMIS, MistScale's memory system. It does not store transcripts. It extracts meaningful facts and emotional signals after each interaction, consolidates them into mood shifts and updated relationships, and retrieves the right past memory at the right moment.

**Q: Can NPCs treat different players differently?**
A: Yes. Every NPC keeps a private record per player. Trust, patience, mood, and emotion are tracked independently. The same character can be warm with one player and hostile to another with no extra setup.

**Q: How does MistScale prevent NPC hallucinations?**
A: Through a three-phase grounding protocol. The NPC tags every factual claim with a source. Unknown claims are re-grounded against MNEMIS memory, the knowledge graph, or uploaded knowledge files. If nothing matches, the NPC uses calibrated uncertainty instead of inventing facts.

**Q: Is MistScale available now?**
A: Yes. MistScale is publicly available. Sign up at https://mistscale.com/signup.

**Q: How is MNEMIS different from regular RAG?**
A: RAG retrieves chunks from documents. MNEMIS extracts meaning from live conversations, consolidates emotional signals into mood shifts, and tracks per-player relationship state. It is a full memory and emotion architecture, not just retrieval.

## Contact

- X (Twitter): https://x.com/mistscale
- LinkedIn: https://linkedin.com/company/mistscale
- Discord: https://discord.gg/mistscale

© 2026 MistScale Inc.