Command-line interface

voiceai is a single static binary that wraps the SLNG API. Use it to generate audio, transcribe files, stream over WebSocket, and pipe audio between tools.

Install

curl -fsSL https://slng.ai/install.sh | sh

brew install slng-ai/tap/voiceai

npm install -g voiceai-cli

Verify the install:

voiceai --help

On macOS, the curl-installed binary is unsigned. If the first run is blocked by Gatekeeper, run xattr -d com.apple.quarantine $(which voiceai) or right-click → Open in Finder once.

Authenticate

Get an SLNG key from app.slng.ai, then export it in your shell:

export VOICEAI_API_KEY="zpka_..."

Or save it to the CLI config:

voiceai config set api-key zpka_...

The config lives at ~/.config/voiceai/config.json. Environment variables take precedence.

Text-to-speech

Synthesize audio from text. By default the CLI plays the audio and saves a copy to $TMPDIR/voiceai-tts/.

voiceai tts "Hello from sunny Barcelona!" \
  --model slng/deepgram/aura:2-en \
  --voice aura-2-thalia-en \
  --out hello.mp3

Pipe raw audio when stdout is not a terminal:

voiceai tts "stream me" --model slng/deepgram/aura:2-en > out.mp3

Stream chunks over WebSocket for long text or low-latency playback:

voiceai tts "long passage…" --stream | ffplay -

Speech-to-text

Transcribe a file:

voiceai stt micro-machines.wav --model slng/deepgram/nova:3-en

Stream from the microphone:

voiceai stt --stream

Pipe raw PCM from arecord or any source:

arecord -f S16_LE -r 16000 -c 1 | voiceai stt --stream --source stdin

Discover models and voices

voiceai models               # list all models
voiceai voices --model slng/deepgram/aura:2-en

Configuration

Defaults that the CLI reads from ~/.config/voiceai/config.json:

Key	Purpose
`api-key`	Default `VOICEAI_API_KEY`
`default-tts-model`	Model used when `--model` is omitted on `tts`
`default-tts-voice`	Voice used when `--voice` is omitted on `tts`
`default-stt-model`	Model used when `--model` is omitted on `stt`
`base-url`	Override the API host (rarely needed)

Set any of them with voiceai config set <key> <value>. Override per-invocation with the matching flag.

Source and releases

Source: github.com/slng-ai/sdks
Releases: github.com/slng-ai/sdks/releases. Tags prefixed cli-v* are CLI builds; everything else is for the SDKs.

Get started

Speech-to-Text

Text-to-Speech

Managed Agents

Integrations

SDKs & Tools

Reference

Install

Authenticate

Text-to-speech

Speech-to-text

Discover models and voices

Configuration

Source and releases

​Install

​Authenticate

​Text-to-speech

​Speech-to-text

​Discover models and voices

​Configuration

​Source and releases

Install

Authenticate

Text-to-speech

Speech-to-text

Discover models and voices

Configuration

Source and releases