> For a complete index of all SignalWire documentation pages, fetch https://signalwire.com/docs/llms.txt

# The Rime TTS engine

> Learn how to use Rime's Arcana and Mist v2 TTS models with SignalWire AI Voice applications.

Rime offers uniquely realistic voices with a focus on natural expressiveness.

## Models

| Model                   | Description                                   |
| ----------------------- | --------------------------------------------- |
| `mistv2`                | **Default** - Updated version of mist         |
| `arcana`                | Expressive model with natural intonation      |
| `mist` <br />Deprecated | Fast, precise model for business applications |

Mist is Rime's fastest model, built for high-volume, business-critical applications.

Arcana is Rime's latest and greatest model, offering a variety of ultra-realistic voices
prioritizing authenticity and character.

## Voices

Mist v2 is the default Rime model on the SignalWire platform.
To use this model, simply set the voice ID.

To use Arcana voices, set `model` to `arcana` with the
[**`languages`**](/docs/swml/reference/ai/languages#use-voice-strings)
SWML method:

```yaml
languages:
- name: English
  code: en-US
  voice: rime.luna
  model: arcana
```

## Languages

As of October 29th, 2025, Rime supports the following languages:

| Language            | Code  |
| :------------------ | :---- |
| English             | `eng` |
| Spanish             | `spa` |
| French              | `fra` |
| German              | `ger` |
| Hindi (Arcana only) | `hin` |

Refer to the
[Rime docs](https://docs.rime.ai/api-reference/voices)
for the most up-to-date reference to supported languages.

## Usage

**Format**: `rime.<speaker>:<model>`

**Examples**:

```
rime.spore:arcana
rime.speaker1:mistv2
rime.voice123:mist
```

For a full demonstration and sample script, see below.

Preview Rime voices on their dashboard

Refer to the Rime Docs for an up-to-date list of voice IDs.

***

## Build with Rime on SignalWire

### Create a Space and add credit

If you don't have one yet, you'll need to
[create a SignalWire Space](/docs/platform/signing-up-for-a-space).
Be sure to add some credit to test with.

### Add a new Resource

Navigate to the **Resources** tab in your [SignalWire Dashboard](https://my.signalwire.com) and click **+ Add New** to create a new Resource.

### Create a SWML Script

From the Resources menu, select **SWML Script**.
Name it something fun and recognizable.
Ours is titled Rime Wizard.

Next, paste the following starter script into the text box, and hit <kbd>Save</kbd>:

```yaml
version: 1.0.0
sections:
  main:
  - ai:
      prompt:
        text: | 
          You're Luna, a voice from Rime's Arcana model! 
          Introduce yourself, and have a conversation about programmable unified communications on the SignalWire platform. 
      languages:
      - name: English
        code: en-US
        voice: rime.luna
        model: arcana
```

### Buy and assign a phone number

Navigate to the **Phone Numbers** section of the Dashboard's left sidebar menu.

Purchase a phone number and assign it to the desired SWML script.

![A purchased phone number showing assignment to a specified Resource.](https://files.buildwithfern.com/signalwire.docs.buildwithfern.com/docs/f0b50511622e76d7be927bd442190e2e41a88745515f22bc727fa5b480e23409/assets/images/dashboard/phone-numbers/assign-resource-voice.webp)

### Give it a call!

Call the number you just assigned to chat with your new AI voice application on the phone.

## Next steps with SWML

Now you've deployed your very first SignalWire voice AI application using Rime voices.
Next, dive deeper into SWML to explore its capabilities!

Documentation for all SWML methods

Build advanced AI applications using SignalWire Markup Language

SWML guides and demo applications