Mnemosyne
Cognitive memory OS for AI agents (zero LLM calls)
Details
- External ID
- 47143857
- Source
- HN
- Company
- —
- Product
- Mnemosyne
- Website domain
- github.com
- Launched
- Feb. 24, 2026
- Cohort
- —
- Upvotes
- 5
- Upvotes percentile
- 0.10512129380053908
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:25 p.m.
- Updated at
- Sept. 7, 2026, 9:25 p.m.
Enrichment
- Theme
- ai agent infrastructure and tooling
- Vertical
- Horizontal
- Function
- Agent / copilot
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- memory system for ai agents without llm calls
- Manually corrected
- False
Could you build this?
Partial While an agent memory API can be prototyped with standard embeddings, designing a full 'cognitive memory OS' with custom non-LLM memory retrieval algorithms and state management requires advanced graph and information retrieval engineering.
What it would actually take: Requires building an embedded high-performance vector/graph hybrid database in Rust or C++, implementing custom graph-based associative memory retrieval and cognitive decay algorithms without relying on LLM summarization. The hard part is achieving deterministic, high-precision retrieval across complex conversational history in single-digit milliseconds, requiring specialized knowledge in information retrieval and memory graph structures.
Discussion
1 comment analyzed.
Competitors mentioned: Mem0, Zep, Cognee, Letta/MemGPT
Concerns raised: LLM API costs at scale ($1,000-3,000/month for 100K memories), Stochastic variance in LLM-based extraction systems
Competitors
Other products that read as similar to this one — 2326 launches clear the similarity bar, closest 8 shown.
Attention rank: #2108 of 2327 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 118 days after the earliest competitor.
- Hebbs · hn · 2026-03-09 · 6 upvotes · similarity 0.76
- A memory learning layer for AI agents to learn on the job · hn · 2026-01-23 · 6 upvotes · similarity 0.73
- I open-sourced two AI agents with real memory (chat and voice, MIT) · hn · 2026-05-26 · 5 upvotes · similarity 0.72
- Hippo, biologically inspired memory for AI agents · hn · 2026-04-06 · 128 upvotes · similarity 0.71
- Friday · hn · 2026-09-16 · 9 upvotes · similarity 0.69
- dolphinbench · github · 2026-09-22 · 29 upvotes · similarity 0.69
- Memctl v0.1.0 Open source shared persistent memory for AI coding agents · hn · 2026-03-01 · 7 upvotes · similarity 0.68
- Lossless-memory · hn · 2026-09-21 · 67 upvotes · similarity 0.66
Other launches for this product
Same idea, different domain
Nobody's really built a agent / copilot tool for Agriculture yet.