shyn — your Mac's memory, on tap ☀️

shyn.day · macOS (Apple Silicon) · pre-alpha · Elastic License 2.0

Shyn is the always-on memory companion for your Mac. It quietly remembers what you see, hear, and read — your screen, your meetings, your browsing, your notes — and gives your AI assistant total recall over your life. Ask Claude "what did we decide in yesterday's standup?" or "where did I read about that retention bug?" and get an answer grounded in your own history, not the internet's.

100% local. Zero cloud. Private by design. Everything shyn captures lives in an encrypted database on your Mac. Nothing is uploaded, synced, or phoned home — the only bytes that ever leave your machine are the few snippets relevant to a question you chose to ask, sent to the AI you chose to ask it.

Status: pre-alpha. Shyn is young, moving fast, and macOS-only (Apple Silicon). Expect rough edges and breaking changes. Install is a two-command Homebrew cask (brew install + shyn setup) — the apps are self-signed and re-signed locally by shyn setup, not Apple-notarized; notarized one-click installs are on the roadmap.

Why shyn

• 🧠 Total recall, instantly. Hybrid search — keyword (FTS5/BM25) + semantic (on-device embeddings) — across everything you've captured, in milliseconds, over a local socket.
• 👁️ Ambient screen memory. A featherweight agent captures the text on your screen as you work — what you read, wrote, and clicked becomes searchable history.
• 🎙️ Meetings, remembered. Shyn detects your calls, records both sides locally, transcribes on-device with Whisper, and files a speaker-labeled transcript into your memory. Audio never crosses a socket and is purged the moment the transcript lands — text in, bytes gone. Grant Calendar access and transcripts get titled from the event they belong to ("Sprint standup", attendees included) — read from your Mac's own calendar store, no Google API, nothing leaves the machine.
• 🌐 Your digital trail, connected. Chrome and Safari history and Apple Notes flow in automatically; files and PDFs on demand.
• ☀️ Glanceable peace of mind. A frosted-glass menu bar companion shows everything is running — one sun in your menu bar, four live states, a pulsing red dot whenever a meeting is being recorded. Never silent, never sneaky.
• 🔒 Consent-first capture. Recording announces itself and is cancellable in its grace window. Pause everything with one click or shyn pause 30m. Exclude apps. Delete anything — forget is byte-honest: vacuumed, gone, not soft-deleted.
• ⚡ Instant-on by design. Keyword search works from second zero; the embedding model downloads in the background and results silently upgrade to hybrid. The model is never on the critical path.

How it works

A background daemon owns an encrypted SQLite index (key in your macOS Keychain) and serves JSON-RPC over a unix socket. Capture agents — screen, meetings — and source readers — Chrome, Safari, Apple Notes — feed it. Your AI talks to it through five MCP tools. That's the whole trick: one private index, many memories, any MCP-speaking assistant.

Quickstart

Install with Homebrew (recommended)

brew install --cask shyn-labs/tap/shyn
shyn setup

Two commands: the cask verifies the download against its pinned checksum, and shyn setup starts everything and walks you through permissions via the ☀️ menu bar window. No Node, no Xcode, no cloning. Read the cask's caveats — they're the honest fine print (local signing, quarantine, EDR). Update later with brew upgrade shyn && shyn setup.

Or build from source (for contributors)

pnpm install

# start the daemon (first run downloads the embedding model in the
# background; search works before that finishes)
pnpm --filter @shyn/daemon start

Register the MCP server with Claude Code:

claude mcp add shyn -- pnpm --dir <path-to-shyn-repo> --filter @shyn/mcp-client exec tsx src/main.ts

Substitute <path-to-shyn-repo> with the absolute path where you cloned this repo (e.g. the output of pwd run from inside it).

Feed it something and ask Claude about it:

pnpm shyn ingest /absolute/path/to/some/folder

Use an absolute path: it's stored as the document's uri. Ingest accepts a single file (.md, .txt, .pdf) or a directory to walk. Pull in browser history and Apple Notes any time with pnpm shyn sync.

Go full companion (daemon + agents + menu bar) — one command

pnpm setup

That's it: installs dependencies, creates a stable local signing identity, builds the daemon bundle + capture agents + status app, and starts everything under launchd. Idempotent — re-run it after every git pull.

Under the hood it stages and starts everything — daemon, screen agent, meeting agent, and the menu bar status app — surviving reboots, logging to ~/Library/Logs/shyn/. Grant the permissions macOS asks for (Microphone + System Audio for meetings; Screen Recording + Accessibility for screen capture; Full Disk Access only if you want Safari/Notes — everything else works without it, no dark patterns, no nagging).

pnpm shyn uninstall           # stop + remove, keep data
pnpm shyn uninstall --purge   # scorched earth: data, logs, keys

Claude Desktop

pnpm build:mcpb produces dist/shyn.mcpb — drag it onto Claude Desktop's Settings → Extensions page. (Registers the MCP client; the daemon must be running via install above.)

Other clients, including fully local models

Shyn is a standard stdio MCP server — any MCP client works, and your memory never has to touch a paid API at all. Tested so far:

• Claude Code / Claude Desktop — daily drivers, best-in-class at knowing when to reach into memory unprompted.

• Qwen3 14B running locally (MLX on Apple Silicon) via Open WebUI, with mcpo bridging MCP to OpenAPI:

  uvx mcpo --port 8600 -- "$HOME/Library/Application Support/shyn/bin/shyn-mcp"
  # then add http://localhost:8600 as a tool server in Open WebUI
  

Honest notes from testing: retrieval quality is identical everywhere — the ranking runs inside the daemon, not the model. What varies is the driver. Smaller local models answer well when you're explicit ("search my memory for…") but are less reliable at deciding to search on their own, and thinking-mode models may need their reasoning reined in (/no_think for Qwen3). Budget ~10GB of unified memory for a 14B model alongside the daemon.

Everyday controls

pnpm shyn status                    # daemon + agents + index health
pnpm shyn search "that one thing"   # search from the terminal
pnpm shyn pause 30m                 # pause all capture (2h, until-tomorrow too); resume to undo
pnpm shyn exclude com.1password.1password   # never capture an app
pnpm shyn meeting status                    # live meeting controls (stop | cancel too)

…or skip the terminal entirely and click the ☀️ in your menu bar.

The fine print (we sweat it so you don't)

• Encryption at rest protects against stolen disks and leaked backups — not against malware running as your own user. We say this out loud.
• Meetings: channel-based speaker labels (Me: / Others:), 10-second cancellable grace before any recording, 180-minute hard cap, temp audio byte-purged on ingest. Transcription defaults to Whisper small; at that size Hindi/Hinglish and other non-English speech often lands as an English gist (documented, not hidden). For markedly better multilingual transcripts, click Multilingual under "Meeting language" in the menu bar popover (a ~3GB one-time download that starts immediately; the popover says plainly which model your next meeting will use). Same switch by hand: "meeting": { "whisperModel": "large-v3" } in ~/Library/Application Support/shyn/capture.json; medium is the middle ground. Config hot-reloads, no restart.
• Meeting titles are optional and layered: the calendar event first (needs Calendar access), the call window's title second (needs Accessibility), plain "app · date" otherwise. Decline everything and meetings still transcribe fine.
• The menu bar app checks GitHub once a day for a newer release — a plain unauthenticated request for the latest version number; nothing about you or your machine rides along. Turn it off with "updateCheck": false in capture.json. The capture agents and the daemon make no network requests, ever.
• Sources that need permissions report themselves unavailable with a plain-language reason instead of silently capturing nothing.
• The eval harness (pnpm eval:keyword, eval:hybrid) runs a synthetic corpus against pre-committed pass/fail bars for CI. It is not a benchmark and its numbers are not an accuracy claim.
• Accepted gaps and sharp edges live in docs/known-issues.md — honesty is a feature.

What shyn never does

• Phones home. No telemetry, no analytics endpoint, no crash reporter. There is no server to send anything to. The one outbound request in the whole system is the menu bar app's daily version check against GitHub (see the fine print) — it carries nothing and turns off with one config key.
• Stores what you searched for. Usage stats are counts in your local database (searches per day as a number — never the query).
• Ships your content anywhere. When something breaks, run shyn diagnose: it prints a copy-pasteable block of versions, service states, and error-log lines — zero document content — and you choose where to paste it.

License

Elastic License 2.0 (source-available).

In plain words: use it, read it, modify it, share it — personally or at work, for free. What you may not do is sell shyn or offer it to others as a commercial or managed service; that right stays with the project. The full text is one page and worth reading.