▶ Watch ClawWatch 1.0.0 launch video · X post

ClawWatch

The first intelligent AI agent running natively on a smartwatch.

Tap. Speak. Get an answer. No cloud STT, no phone dependency, no latency from middlemen.

ClawWatch runs NullClaw — a 2.8 MB static ARM binary — directly on a Galaxy Watch, paired with offline speech recognition (Vosk) and the built-in TTS engine. The agent talks to Claude Opus 4.6 (or any model you configure) and speaks the response back through the watch speaker.

Watch the ClawWatch 1.0.0 launch video

Screenshots

Blank  •  Ear  •  Cloud  •  Dots

Architecture

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How it works

[tap mic] → Vosk STT (on-device, offline) → NullClaw → Claude Opus 4.6 → Android TTS → [watch speaks]

Everything except the LLM call runs on the watch itself. No companion app needed once deployed.

Stack

Component	What	Size
NullClaw	Agent runtime (Zig, static binary)	2.8 MB
Vosk	Offline speech-to-text	~68 MB
Android TextToSpeech	Voice output	0 MB (pre-installed)
Claude Opus 4.6	Intelligence	cloud

Total on-device footprint: ~71 MB

Requirements

• Samsung Galaxy Watch 4 or newer (Wear OS 3+)
• Android phone for initial ADB setup
• Anthropic API key (or any provider NullClaw supports)
• Mac/Linux for building

Build

1. Install tools

brew install zig   # must be 0.15.2

2. Build NullClaw for ARM Android

git clone https://github.com/nullclaw/nullclaw
cd nullclaw
zig build -Dtarget=arm-linux-musleabihf -Doptimize=ReleaseSmall
cp zig-out/bin/nullclaw ../ClawWatch/app/src/main/assets/nullclaw

3. Configure

cp app/src/main/assets/nullclaw.json.example app/src/main/assets/nullclaw.json
# Edit nullclaw.json — set your provider and model
# Default: Anthropic + claude-opus-4-6
# The API key is NOT stored in this file — it's pushed via ADB (see Deploy)

4. Download Vosk model

cd app/src/main/assets
curl -L https://alphacephei.com/vosk/models/vosk-model-small-en-us-0.15.zip -o vosk.zip
unzip vosk.zip && mv vosk-model-small-en-us-0.15 vosk-model-small-en-us && rm vosk.zip

5. Build APK

echo "sdk.dir=$HOME/Library/Android/sdk" > local.properties
JAVA_HOME="/Applications/Android Studio.app/Contents/jbr/Contents/Home" \
  ./gradlew assembleDebug

Deploy

Enable ADB on the watch

1. Settings → About watch → Software → tap Software version 5× → Developer options unlocked
2. Settings → Developer options → ADB debugging ON + Wireless debugging ON
3. Note the IP and port shown on screen

Install

adb connect <watch-ip>:<port>
adb install app/build/outputs/apk/debug/app-debug.apk

Set API key (from your Mac — no typing on watch)

./set_key.sh sk-ant-your-key-here

That's it. Open ClawWatch on the watch.

Usage

Action	Result
Tap mic button	Start listening
Speak	Partial transcript shown while speaking
Stop speaking	NullClaw + LLM processes query
Tap again	Interrupt at any point
Swipe left on avatar	Switch to next avatar
Swipe right on avatar	Close app

The watch speaks the response aloud via the built-in speaker.

Watch UI Spec (V1)

• Layout after splash: avatar + one adaptive button below it.
• State model: idle, listening, thinking, searching, speaking, error.
• Adaptive button behavior:
  • idle -> tap starts listening
  • listening -> tap stops listening
  • thinking/searching/speaking -> tap cancels current flow
  • error -> tap retries (starts listening)
• Auto-listen: after speaking finishes, mic opens automatically for a short follow-up window; if no speech is detected, it returns to idle.
• Low battery rule: when battery is below 20%, avatar turns greyer and avatar animations stop.
• Avatar options: ant, lobster, robot, boy, girl.
• Conversation memory: rolling recent turns are included in each query for follow-ups.
• Screen policy: screen stays awake during active conversation states (listening/thinking/searching/speaking) and returns to normal sleep in idle.
• Action bubble: compact flat bubble (no dark halo/ring overlap).

Admin Panel

A local web UI for configuring the watch agent from your Mac — no ADB commands needed after initial install.

cd admin
npm install
node server.js
# Open http://localhost:4747

The admin panel lets you:

• Watch target connect — set IP:PORT and connect from the UI
• Watch status — live ADB connection indicator (green dot when connected)
• API key — push directly to the watch with one click
• Tavily key — recommended live web RAG key (free tier)
• Brave key — alternative web search key
• Model — switch between providers and models (claude-opus-4-6, gpt-4o, gemini, etc.)
• Avatar selector — choose lobster/ant/robot/boy/girl and push to watch
• Max tokens — slider with live value
• RAG mode — off, auto-search, or opus tool use
• System prompt — edit the agent's personality and instructions
• Push all settings — merges and pushes settings to watch in one click
• Capture logs — download watch logcat snapshot for crash/debug review
• Rebuild & reinstall — triggers ./gradlew assembleDebug && adb install from the browser

The admin panel talks to the watch via ADB. Make sure adb connect <watch-ip>:<port> is active before pushing.

Configuration

Edit nullclaw.json to change model or provider:

{
  "provider": "anthropic",
  "model": "claude-opus-4-6",
  "max_tokens": 150,
  "system": "Your system prompt here"
}

NullClaw supports 22+ providers including OpenRouter, OpenAI, Gemini, Groq, Mistral, Ollama, and any OpenAI-compatible endpoint. See NullClaw docs for the full list.

Why NullClaw?

	OpenClaw	NullClaw
RAM	>1 GB	~1 MB
Startup	500+ s	<8 ms
Binary	~28 MB	2.8 MB
Language	TypeScript	Zig

A watch has 1.5–2 GB RAM. NullClaw uses 1 MB of it. OpenClaw would need the entire device.

License

AGPL-3.0 — see LICENSE

Built by ThinkOff · Powered by NullClaw · Logo by herrpunk