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Show HN: Kai – a private, offline AI "second brain" that remembers you(no cloud)
3 no_internet 1 8/27/2025, 9:53:43 PM oneeko.ai ↗
I built Kai because I was tired of assistants that forget and cloud tools that mine my data. Persistent memory: what you teach Kai sticks. Local-first: data never leaves your device; no telemetry. Transparent: memory graph shows what it knows and why. I’m looking for early users who care about local, privacy, and explainability. The landing page has a simple waitlist; I’ll onboard in small waves and share progress.
Stack: Python 3.10, FastAPI (async), WebSockets UI.
Storage: SQLite for persistence + sqlite-vec (384-d cosine) for vector search; ChromaDB used as an in-memory hot cache.
Embeddings: all-MiniLM-L6-v2 (384-d), CPU ~50ms/query.
LLM options (Ollama/local): TinyLlama 1.1B / Phi-2 2.7B / Gemma 2B (4GB); Mistral 7B Q4 / Llama-2 7B Q4 (8GB); Llama-3 8B / Mixtral 8×7B (16GB+). GPU optional for 5–10× speedup.
Memory tiers:
Hot: in-memory (Chroma), LRU ~5k items with score decay.
Warm: SQLite + sqlite-vec persistent store; promotes on read.
Cold: archived to disk; periodically compacted.
Graph/Why: NetworkX graph for explainability; basic activation spreading + auto-linking on similarity threshold.
Security: data lives under ~/kai/ with user-only perms; no encryption at rest yet. Export (/memory/export) and full delete scripts included.
Roadmap (short): VS Code ext (MCP), Obsidian bridge via local REST, encryption-at-rest, and open-sourcing the graph/algorithms component. Pricing: free for personal use during early access; long-term pricing TBD.
Happy to go deeper on any of the above.