AI · alternatives · 2026

24 alternatives to Mnemosyne

An open-source memory engine born from Hermes. Sub-ms recall

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Mnemosyne▲2

   Local-first AI memory layer. Plain markdown.

   Jun 2026 · github.com · its alternatives →

2. 2
   Mnemosyne Local hierarchical memory engine for AI agents (MCP Native)▲10

   Gomaa — Autonomous Agent Memory OS. Persistent memory system for AI agents with Obsidian vault integration, hybrid RRF search, knowledge graphs, security gates, and MCP server. - M4F-S/gomaa

   Aug 2026 · github.com · its alternatives →

3. 3
   Mnemo – local-first AI memory layer for any LLM (Rust, SQLite,petgraph)▲60

   Local-first AI memory layer for any LLM. Persistent knowledge graph, entity extraction, semantic retrieval. Works with Ollama, OpenAI, Anthropic, or any OpenAI-compatible backend. - zaydmulani09/mnemo

   Jun 2026 · github.com · its alternatives →

4. 4
   Mnemosyne – Cognitive memory OS for AI agents (zero LLM calls)▲5

   Cognitive Memory OS for AI Agents — persistent, self-improving, multi-agent memory - 28naem-del/mnemosyne

   Feb 2026 · github.com · its alternatives →

5. 5
   Agentmemory▲310

   Persistent memory for Claude Code, Codex & coding agents

   May 2026 · agent-memory.dev · its alternatives →

6. 6
   Hermes Desktop▲215

   An open source terminal agent that builds its own skills

   Jun 2026 · hermes-agent.nousresearch.com · its alternatives →

7. 7
   MemoryCustodian▲145

   Repo-native memory for coding agents

   Jul 2026 · github.com · its alternatives →

8. 8
   DeltaMemory▲104

   Most AI agents forget everything between sessions. We built DeltaMemory to fix that. It's a cognitive memory layer that gives agents persistent recall, automatic fact extraction, and temporal reasoning — via a single SDK call. Key numbers: - 89% accuracy on LoCoMo long-term conversation benchmark - 50ms p50 retrieval latency - 97% cost reduction vs raw token re-processing Open source SDKs, works with any LLM stack. Currently in early access. Happy to answer questions about the architecture, benchmark methodology, or how we handle knowledge graphs.

   Feb 2026 · deltamemory.com · its alternatives →

9. 9
   A local-first memory store for LLM agents (SQLite)▲48

   Local persistent memory store for LLM applications including claude desktop, github copilot, codex, antigravity, etc. - CaviraOSS/LongMemory

   Dec 2025 · github.com · its alternatives →

10. 10
    Claude-Mem▲115

    AI agent memory, everywhere. claude-mem is open-source memory for Claude Code; cmem links it to any MCP client — Cursor, Codex, more — via one private link.

    Dec 2025 · cmem.ai · its alternatives →

11. 11
    Engrim – A universal, local-first SQLite memory engine for AI CLIs▲93

    The Universal Cross-Model Episodic Memory Standard. Local-first, project-scoped SQLite memory engine for Google Antigravity, Claude Code, Cursor, and Windsurf. Zero cloud lock-in. - timgordontg/engrim

    Sep 2026 · github.com · its alternatives →

12. 12
    MCP Memory – Fast Agent Memory Using Google's OKF and SQLite FTS5▲70

    An OKF-backed Model Context Protocol (MCP) server delivering persistent long-term memory and SQLite FTS5 search for AI agents. - fellowgeek/mcp-memory

    Aug 2026 · github.com · its alternatives →

13. 13
    Mnexium AI▲83

    Persistent, structured memory for AI Agents

    Jan 2026 · mnexium.com · its alternatives →

14. 14
    Memno▲104

    We built Memno. We like to think of Memno as an AI chief of staff. Every photo, document, and voice note you share becomes searchable memory. Ask "What did we decide about Q4?" and it pulls from all your sources. Can also make calls and send texts on your behalf (with approval!) Each user gets their own isolated environment with dedicated vector database, metadata storage, and object storage instances. Some highlights: - Complete data isolation per user (no shared databases), encrypted at rest - Sub-50ms vector search - Document processing pipeline for OCR/transcription/object…

    2025 · memno.ai · its alternatives →

15. 15
    Mnemosyne

    Semantic AI with Zero-Knowledge Encryption Absolute Privacy

    Jan 2026 · mnemosyne-one.web.app · its alternatives →

16. 16
    MemSQL▲114

    World's fastest in-memory database

    2015 · singlestore.com · its alternatives →

17. 17
    Mnemo▲2

    Auditable, citation-backed memory for production AI agents

    Jul 2026 · mnemohq.com · its alternatives →

18. 18
    A memory database that forgets, consolidates, and detects contradiction▲48

    Vector databases store memories. They don't manage them. After 10k memories, recall quality degrades because there's no consolidation, no forgetting, no conflict resolution. Your AI agent just gets noisier. YantrikDB is a cognitive memory engine — embed it, run it as a server, or connect via MCP. It thinks about what it stores: consolidation collapses duplicate memories, contradiction detection flags incompatible facts, temporal decay with configurable half-life lets unimportant memories fade like human memory does. Single Rust binary. HTTP + binary wire protocol. 2-voter + 1-witness HA…

    Apr 2026 · github.com · its alternatives →

19. 19
    Built a memory layer that stops AI agents from forgetting everything▲13

    Tired of AI coding tools that forget everything between sessions? Every time I open a new chat with Claude or fire up Copilot, I'm back to square one explaining my codebase structure. So I built something to fix this. It's called In Memoria. Its an MCP server that gives AI tools persistent memory. Instead of starting fresh every conversation, the AI remembers your coding patterns, architectural decisions, and all the context you've built up. The setup is dead simple: `npx in-memoria server` then connect your AI tool. No accounts, no data leaves your machine. Under the hood it's TypeScript +…

    2025 · github.com · its alternatives →

20. 20
    MemoryOS▲3

    Hybrid AI Memory: Vector RAG meets Knowledge Graphs

    Apr 2026 · github.com · its alternatives →

21. 21
    Memori – Open-Source Memory Engine for AI Agents▲17

    Hey HN! I'm Arindam, part of the team behind Memori (https://memori.gibsonai.com/). Memori adds a stateful memory engine to AI agents, enabling them to stay consistent, recall past work, and improve over time. With Memori, agents don’t lose track of multi-step workflows, repeat tool calls, or forget user preferences. Instead, they build up human-like memory that makes them more reliable and efficient across sessions. We’ve also put together demo apps (a personal diary assistant, a research agent, and a travel planner) so you can see memory in action. Current LLMs are stateless…

    2025 · github.com · its alternatives →

22. 22
    MemorySync – Memory for AI Agents▲22

    Tell MemorySync a fact, reload the page, then ask for it back in your own words. No signup. Every API call shown in cURL, Python and Node.js.

    10d ago · memorysync.io · its alternatives →

23. 23
    Mnemo▲9

    Easily save, find, & share all discoveries. AI-powered.

    2025 · mymnemo.com · its alternatives →

24. 24
    Oodle.ai – $10 per million agent traces▲31

    Hi HN, we're Kiran and Vijay! Over the past two years, we have built a columnar storage engine for observability: logs, metrics, and traces. Today, it's exciting for us to show what we've built on top of that foundation: LLM Agent Observability. Given how non-deterministic agents are, storing all traces without sampling was critical for us. But these traces tend to be in the MBs, sometimes GBs - we needed to store them inexpensively. We also needed the queries and analyses to be fast. To meet both these goals, we store them in S3 in our own parquet-like file format, and query them using AWS…

    Jul 2026 · oodle.ai · its alternatives →

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