Spirit AI Character Engine alternatives

Defunct: Spirit AI Limited entered members' voluntary liquidation (liquidators appointed 2023-09-18). Authoring toolkit + SDK for narrative designers. Full Spirit AI Character Engine record →

  1. 1 BenevolentAI Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same conflict handling (overwrite) · same memory unit (fact)

    OSS ? Self-host — Managed ✓ MCP ? Compare with Spirit AI Character Engine →

  2. 2 Causaly Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same conflict handling (overwrite) · same memory unit (fact)

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Spirit AI Character Engine →

  3. 3 Charisma.ai Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same conflict handling (overwrite) · same memory unit (fact)

    OSS ? Self-host — Managed ✓ MCP ? Compare with Spirit AI Character Engine →

  4. 4 Eve — Shared Firm Knowledge + Auditor Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same memory unit (fact)

    OSS ? Self-host ? Managed ? MCP ? Compare with Spirit AI Character Engine →

  5. 5 FutureHouse Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same memory unit (fact)

    OSS ? Self-host — Managed ✓ MCP ? Compare with Spirit AI Character Engine →

  6. 6 Harvey Memory Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same memory unit (fact)

    OSS ? Self-host ✓ Managed ✓ MCP ✓ Compare with Spirit AI Character Engine →

  7. 7 Inworld AI Vertical / domain-specific AI memory

    also in Vertical / domain-specific AI memory · same storage (graph) · same retrieval (graph-traversal) · same memory unit (fact)

    OSS ? Self-host ✓ Managed ✓ MCP ? Compare with Spirit AI Character Engine →

  8. 8 RemNote AI Personal AI / PKM / lifelogging memory

    same storage (graph) · same retrieval (graph-traversal) · same conflict handling (overwrite) · same memory unit (fact)

    OSS ? Self-host — Managed ✓ MCP ? Compare with Spirit AI Character Engine →

Ranked by shared memory design (storage, retrieval, conflict handling, memory unit), same section and shared must-haves (open source, self-hosting, MCP), with adoption as a tie-breaker. ✓ confirmed · — no · ? not in the catalog yet. Want picks for your own requirements? Use the chooser. Checking a whole project? Check your stack.