A local-first memory engine that runs on the Python standard library alone. Sub-millisecond writes, a hash-chained audit ledger, and pure SQLite storage — no vector cloud, no vendor lock-in, no data leaving your machine.
Mnemosyne gives agents persistent memory without a pipeline change. Less redundant context, lower token cost, measurably faster responses.
Try it nowThree stages run on every write and every read. No configuration, no boilerplate, no pipeline to rewire.
Things that happened in time and things that relate to each other are structurally different. BEAM stores them differently, then assembles a single injection under a token budget.
Pure wireframe — every line and packet is drawn in-browser with SVG. No library, no canvas, no colour noise.
Mnemosyne helps AI remember what matters.
Mnemosyne exposes its 20 tools over the standard Model Context Protocol, so it mounts without a bespoke adapter. Every transport below has a runnable or a config in the repository.
Every entry above rides the public MCP surface — stdio or Streamable HTTP. No forked client, no vendor plugin, no private SDK.
Single-pass hierarchical distillation. Multi-signal retrieval. Benchmarked across LoCoMo, LongMemEval and BEAM — the three benchmarks the memory field is actually judged on.
Source note — Mnemosyne figures come from this project's 7.0.2 benchmark and retrieval-quality reports, measured on a real local corpus. Competitor figures are order-of-magnitude estimates drawn from their public documentation and pricing pages; they are not same-hardware head-to-head results. The chart shows architectural order of magnitude, not a lab comparison.
Memory at scale is infrastructure. Mnemosyne gives teams governance, portability and full observability so engineers spend time building, not recovering lost context.
Compliance is documented rather than asserted: a mapping for HIPAA, 等保, GDPR and PIPL ships with the repository, alongside a SHA-256 hash-chain ledger that makes tampering detectable rather than deniable.
The engine is MIT. You pay for multi-tenancy, cloud coordination and compliance delivery — never to unlock a feature.
Final pricing subject to commercial confirmation. A complete free-tier cloud deployment package (managed free VM + free embedding API + free HTTPS tunnel) ships inside the repository.
No account, no credit card, no network. One pip command and your machine has a memory engine that will not forget you.
python 3.8+ · windows / macOS / linux · offline capable · no telemetry