Local-first · Open-Source · Private

Your notes,

Capture ideas with voice, find anything with semantic search, and let AI organize your thoughts — all on your device.

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How it works

From thought to organized knowledge — in seconds

No complex setup. No manual filing. Just capture and let Tentacle do the rest.

Record your voice

Speak your thoughts. No typing needed — Tentacle captures audio directly on your device.

AI organizes everything

Transcribed, tagged, and indexed automatically. Your note is searchable before you blink.

Sync everywhere

optional

Enable cloud sync to access your notes on any device, encrypted end-to-end.

Privacy First

Your notes never leave your device unless you want them to

Tentacle is built on a local-first architecture. All your notes, embeddings, and search indexes are stored locally. We can't read your notes even if we wanted to.

All data stored in a local vector database
Embeddings computed on-device
Optional end-to-end encrypted cloud sync
Export to Obsidian anytime
Open source and auditable

Everything you need to capture and organize ideas

Powerful features that work locally on your device, with optional cloud AI when you need it.

Semantic Search

Find notes by meaning, not just keywords. Local embeddings understand what you're looking for — no cloud required.

Voice Capture

Capture ideas instantly with voice recording. Transcribed locally using Whisper or with your own OpenAI key.

Auto-Tagging

Let AI automatically organize your notes with relevant tags. Free users can BYOK, Pro users get it included.

Markdown Support

Write in Markdown with a beautiful editor. Export to Obsidian or any other Markdown-compatible tool.

AI-Powered RAG

PRO

Ask questions across all your notes. Get answers sourced from your own thoughts, not the internet. Your personal research assistant.

Cloud Sync

PRO

Access your ideas on any device. End-to-end encrypted cloud sync means your notes are available everywhere, but readable only by you.

Works with any agent

Tentacle also ships as a CLI app, so your agents can use your knowledge base directly.

Agent Zero

OpenClaw

Claude Code

Codex

OpenCode

Download Skill Learn More

tentacle — zsh

# save a note

$ echo "Use JWT with 7-day refresh tokens" | tentacle create --title "Auth decision" --folder projects --json

✓ Saved as id: a1b2c3d4

# find it later

$ tentacle search "auth decision" --json

1) Auth decision id: a1b2c3d4

# read full content

$ tentacle read a1b2c3d4 --json

{"title":"Auth decision","content":"Use JWT with 7-day refresh tokens"}

# optional: summarize with your LLM

$ tentacle read a1b2c3d4 --json | claude "summarize in one sentence"

→ JWT auth with 7-day refresh tokens for simple stateless sessions.

Simple, transparent pricing

Start free, upgrade when you need more power. No hidden fees.

Free

Perfect for getting started with local note-taking

Local note storage
Semantic search (local embeddings)
Voice capture with BYOK
Manual tagging
Markdown export to Obsidian
BYOK auto-tagging (with friction)

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Ready to build your second brain?

Join people who trust Tentacle to organize their thoughts, capture ideas, and find knowledge instantly — all on their own device.

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No credit card required. Free forever.