- name
- imessage-voice-reply
- version
- 1.0.1
- description
- Send voice message replies in iMessage using local Kokoro-ONNX TTS. Generates native iMessage voice bubbles (CAF/Opus) that play inline with waveform — not file attachments. Use when receiving a voice message in iMessage and wanting to reply with voice, enabling voice-to-voice iMessage conversations, or sending audio responses. Zero cost — all TTS runs locally. Requires BlueBubbles channel configured in OpenClaw.
iMessage Voice Reply
Generate and send native iMessage voice messages using local Kokoro TTS. Voice messages appear as inline playable bubbles with waveforms — identical to voice messages recorded in Messages.app.
How It Works
Your text response → Kokoro TTS (local) → afconvert (native Apple encoder) → CAF/Opus → BlueBubbles → iMessage voice bubbleSetup
bash ${baseDir}/scripts/setup.shInstalls: kokoro-onnx, soundfile, numpy. Downloads Kokoro models (~136MB) to ~/.cache/kokoro-onnx/.
Requires: BlueBubbles channel configured in OpenClaw (channels.bluebubbles).
Generating and Sending a Voice Reply
Step 1: Generate audio
Write the response text to a temp file, then pass it via --text-file to avoid shell injection:
echo "Your response text here" > /tmp/voice_text.txt
${baseDir}/.venv/bin/python ${baseDir}/scripts/generate_voice_reply.py --text-file /tmp/voice_text.txt --output /tmp/voice_reply.cafAlternatively, pass text directly (ensure proper shell escaping):
${baseDir}/.venv/bin/python ${baseDir}/scripts/generate_voice_reply.py --text "Your response text here" --output /tmp/voice_reply.cafOptions:
--voice af_heart— Kokoro voice (default: af_heart)--speed 1.15— Playback speed (default: 1.15)--lang en-us— Language code (default: en-us)
Security note: The Python script uses argparse and subprocess.run with list arguments (no shell=True). Input is handled safely within the script. When calling from a shell, prefer --text-file for untrusted input to avoid shell metacharacter issues.
Step 2: Send via BlueBubbles
Use the message tool:
{
"action": "sendAttachment",
"channel": "bluebubbles",
"target": "+1XXXXXXXXXX",
"path": "/tmp/voice_reply.caf",
"filename": "Audio Message.caf",
"contentType": "audio/x-caf",
"asVoice": true
}Critical parameters for native voice bubble:
filenamemust be"Audio Message.caf"contentTypemust be"audio/x-caf"asVoicemust betrue
All three are required for iMessage to render the message as an inline voice bubble with waveform instead of a file attachment.
Voice Options
| Language | Female | Male |
|---|---|---|
| English | af_heart ⭐ | am_puck |
| Spanish | ef_dora | em_alex |
| French | ff_siwis | — |
| Japanese | jf_alpha | jm_beta |
| Chinese | zf_xiaobei | zm_yunjian |
When to Reply with Voice
Reply with a voice message when:
- The user sent you a voice message (voice-for-voice)
- The user explicitly asks for an audio/voice response
Always include a text reply alongside the voice message for accessibility.
Audio Format
- macOS: CAF container, Opus codec, 48kHz mono, 32kbps — encoded by Apple's native
afconvert. Identical to what Messages.app produces. - Fallback: MP3 via ffmpeg (works but may not render as native voice bubble on all iMessage versions).
Cost
$0. Kokoro TTS runs entirely locally. No API calls for voice generation.
Troubleshooting
Voice message shows as file attachment — Ensure all three parameters are set: filename="Audio Message.caf", contentType="audio/x-caf", asVoice=true.
First word clipped — The script prepends 150ms silence automatically. If still clipped, increase the silence pad in the script.
Kokoro model not found — Run bash ${baseDir}/scripts/setup.sh.
afconvert not found — Only available on macOS. Script falls back to ffmpeg/MP3 on Linux.