Mycelium against the memory-layer category, on the axes procurement scores against.

Eight axes (definitions)

• Plain-text customer-owned memory. Memory in readable, portable format (Markdown / JSON over Git), not a proprietary binary blob the vendor owns.
• Version-controlled (Git-style). Branching, merging, and time-travel against the customer's own Git remote.
• Multi-tenant safe. Per-tenant authentication and isolation suitable for a Fortune 100 procurement review.
• Audit-logged R/W. Timestamp + actor + source on every read and write, append-only retention.
• Model-portable. Same memory works under Claude, GPT, Gemini, Llama without re-migration.
• Open core (MIT / Apache). Substrate is publicly licensed open-source; runtime ships under commercial license.
• Ten or more enterprise connectors. Live, supported, customer-deployable connectors to enterprise systems (Salesforce, Slack, ServiceNow, etc.).
• Bi-temporal queries. Queries answer what was true at time T against memory itself, not just at the system's transaction time.

Scorecard

Hover any column header to see the axis definition.

Per-vendor notes

• Mycelium8/8

  Full coverage on all eight axes. Open core under MIT at github.com/adelaidasofia/ai-brain-starter; productized commercial runtime at myceliumai.co. Trust Center carries the live cert + audit cadence.

• Mem05/8

  Closest enterprise feature surface. SOC 2 + HIPAA + BYOK + Kubernetes / private cloud / air-gapped deployment + audit log + open core (Apache-2.0, ~48K stars). Lacks plain-text customer ownership, Git-style version control, and bi-temporal queries. Funded $24M total (Kindred Ventures + Basis Set Ventures), YC S24.

• Zep / Graphiti5/8

  Temporal knowledge graph with sub-200ms p99 published claim, SOC 2 Type II + HIPAA. Multi-tenant SDKs (Python, TS, Go). Bi-temporal queries via validity ranges. No plain-text customer-owned substrate, no Git-style versioning. YC W24.

• Cognee4/8

  World-model knowledge graph with ECL pipeline (Extract, Cognify, Load). Multi-tenant, on-prem, fine-grained permissions. Apache-2.0 core (~12K stars). $7.5M seed early 2026 (Pebblebed-led). No plain-text substrate, no Git-style versioning, no public bi-temporal API.

• Hyperspell3/8

  Closed-source SaaS, multi-SaaS connectors (Gmail, Slack, Notion, Drive). SOC 2 + GDPR claimed. Tom Blomfield batch partner. No open core, no on-prem, no Git versioning, no bi-temporal queries. ~$2M raised, YC F25.

• Letta (formerly MemGPT)2/8

  Full agent runtime inspired by OS memory hierarchies. Apache-2.0 core (~16K stars). Recently shipped Context Repositories (Git-based versioning + branching). Memory tightly coupled to the Letta runtime; not a neutral substrate other agents can read. ~$10M seed (Felicis-led).

• MemoryLake5/8

  Strong governance, traceability, conflict resolution, timeline backtracking (bi-temporal). Multi-model + portable. Closed-source. Generous free tier. Funding details thin in public sources. Often ranks 'best overall for AI memory infrastructure' in third-party comparisons.

Source notes

Scoring methodology, citation sources, and per-vendor research are in the Mycelium Competitive Landscape research file (private; available on request to F100 prospects under NDA via contact@myceliumai.co). The 8-axis scorecard re-runs quarterly; the next pass is scheduled for 2026-08. If a vendor's status has changed since this page was last updated and we have not caught it, write to contact@myceliumai.co with a public source link.

Where this page sits in the credibility chain

This page is Mycelium's reading of the category, sourced to public documents. It is not a third-party analyst report. Vendors listed have not reviewed or signed off on their entries. If a competitor disputes any row, contact@myceliumai.co; we will re-source against their public docs and update.