Spirit AI Character Engine
https://www.spiritai.com/character-engine/
Defunct: Spirit AI Limited entered members' voluntary liquidation (liquidators appointed 2023-09-18). Authoring toolkit + SDK for narrative designers. Tracks what each character knows, doesn't know, has witnessed; explicit handling of NPC knowledge inconsistency across sessions. Used in AR/VR and Alexa-style voice game contexts.
Archived · Verified 2026-10-29 · fresh as of 2026-10-29 · 26 cited facts, 6 with a third-party source · 2 recorded changes · Suggest a correction
At a glance
- Type
- Author-defined character knowledge graph vendor fix
- Tier
- T2
- Created
- 2015 (founded 2015 by Steve Andre; London UK) third-party fix
- Latest release
- not applicable — not OSS fix
- License
- not applicable — not OSS fix
- GitHub
- not applicable — no GitHub repo fix
- Pricing
- searched not found fix
- Funding
- searched not found; company in members' voluntary liquidation (liquidators appointed 2023-09-18) third-party fix
- Freshness
- 2026-10-29 fix
- Layer
- agent-infra repo fix
- Licensing
- commercial vendor fix
Memory taxonomy
- storage
- graph
- retrieval
- graph-traversal
- persistence
- cross-session
- update
- overwrite
- unit
- fact
- governance
- user-controllable
- conflict
- overwrite
When to use
Optimised for: character consistency + narrative continuity + low-latency
Anti-fit: not for non-character / non-narrative use cases
Pros & cons
Pros
Game-character AI focused on emotional state memory + narrative context.
Cons
Niche to interactive narrative; smaller mind-share than Inworld.
Claims & capabilities
Notable for narrative designer Emily Short's involvement.
Technical surface
- API surface
- searched not found
- Backend storage
- searched not found
- Deployment
- searched not found
- Embedding model
- searched not found
- Multi-tenancy
- searched not found
- MCP
- no MCP support advertised — vertical product, no MCP server / client integration documented
- A2A
- no A2A protocol support advertised — vertical product, no A2A integration documented
- OpenTelemetry
- no OpenTelemetry integration advertised — vendor logs/observability not publicly documented
Alternatives to Spirit AI Character Engine → live options ranked by shared design, licence, hosting and MCP support
Similar systems
Other vertical / domain-specific ai memory in the catalog, ranked by inbound references.
- Inworld AI T1
Formerly an NPC character engine with named Long-Term Memory; now sells realtime voice models (TTS-2, STT-1, speech-to-speech) and OpenAI-compatible open-model inference. Character/NPC memory is no longer the headline product.
- NVIDIA ReMEmbR T3
Builds long-horizon memory by captioning video segments with VILA, storing captions with timestamps + 3D position coordinates in MilvusDB. At query time, LLM iterates retrieval across text, time, and position modalities. Deployed on Nova Carter robot (Jetson Orin).
- Abridge T1
Clinician-assist ambient documentation. Source mapping: every AI-generated summary element traced back to the source utterance. Audit-and-trust layer over episodic memory. Built on proprietary 1.5M+ medical-encounter dataset.
- ASAPP GenerativeAgent T1
Treats memory as first-class architecture. Captures the digital footprint of every interaction; retrieves preference and history at engagement time. Public example: airline knowing a frequent flyer wants aisle seats with her son — preference-aware, not just history-lookup.
- BenevolentAI T1
Taken private: merged into Osaka Holdings (renamed BenevolentAI S.A.) and delisted from Euronext Amsterdam 2025-03-13. Target identification / drug repurposing / mechanism tracing. 85+ data sources, petabyte-scale, rebuilt every few weeks. Wet-lab results re-enter the graph and shift downstream predictions — institutional experimental memory closing a feedback loop. As of Oct 2026 benevolent.com leads with Qor, powered by BenevolentAI, a life-science intelligence service for biopharma decision makers and consultancies. Qor (qor.one) is a continuously updated decision-intelligence service built on BenevolentAI's knowledge graph and reasoning methods: it tracks evidence on an asset or indication (competitive position, rival readouts, comparable deals), source-verifies each claim and flags when an earlier conclusion stops holding. It targets biotech teams and life-science consultancies.
- Causaly T1
Agentic AI platform for life sciences: orchestrated scientific agents over a curated biomedical knowledge graph (plus Bio Graph and Pipeline Graph), an evidence-retrieval system and an enterprise data fabric over literature, trials and patents.
Sources (25 cited facts, 6 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is Author-defined character knowledge graph vendor
- What it does & what's distinct Defunct: Spirit AI Limited entered members' voluntary liquidation (liquidators appointed… third-party
- Claims / benefits Notable for narrative designer Emily Short's involvement. vendor
- Modalities text vendor
- Created 2015 (founded 2015 by Steve Andre; London UK) third-party
- Funding searched not found; company in members' voluntary liquidation (liquidators appointed 202… third-party
- Customers / scale Game studios, interactive fiction authors third-party
- HQ UK third-party
- Founders / pedigree Steve Andre (CEO) third-party
- Memory volume / scale no scale claim vendor
- Tombstoning hard-delete supported vendor
- Schema evolution schema with migration vendor
- Namespace primitives per-tenant vendor
- Contradiction handling always overwrite (last-write-wins) vendor
- Forgetting policy user-controlled forget vendor
- Validated verticals gaming (AAA + indie), interactive narrative, AI companions vendor
- Time to running <10min (SDK download / hosted API) vendor
- Anti-fit not for non-character / non-narrative use cases vendor
- Optimised for character consistency + narrative continuity + low-latency vendor
- Adjacent infrastructure requires game engine integration (Unity / Unreal); BYO LLM vendor
- Pros Game-character AI focused on emotional state memory + narrative context. vendor
- Cons Niche to interactive narrative; smaller mind-share than Inworld. vendor
- Project & sources Character Engine vendor
- licensing-bucket commercial vendor
- taxonomy-three-layer-rollup agent-infra repo
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)