Nuance Labs Emma: what it is and how to try it

Emma is an AI video persona from Nuance Labs, a Seattle startup, that listens and reacts with her face while you are still talking. She runs in a browser at emma.nuancelabs.ai, you do not need an account, and she launched on November 9.

The launch came from co-founder @fangchangma, who wrote that "Most AI personas stare blankly while you talk" and said Emma took 18 months of research. The company account, @nuance_ai, called her "the first AI persona built on our Nuplex foundation model."

What Emma is

Most talking avatars take turns. You speak, the avatar stares at you until you finish, then it answers. Emma runs on Nuplex 1.0, which Nuance describes as a full-duplex audiovisual model: it listens and speaks at the same time, and her face is part of the conversation along with her voice. So she can nod or smile in the middle of your sentence, the way a person across the table would.

Turn the camera on and, according to Nuance's launch page, she can also talk about what she sees. Her face and voice are licensed from a real actress who worked with the team. Emma is built to say she is an AI and will not claim to be human.

We have covered the pieces of this before. GPT-Live brought listen-while-talking to voice, and Tavus Griffin put a rendered face on an agent. Emma is the first one we have seen that does both in a single model.

The 89% number

Nuance's headline claim is about timing. On 1,785 questions pulled from its own recordings of real conversations, the company says Nuplex's reply timing matched the original human speaker's 89% of the time, and the next closest system managed 35%.

Treat that as a vendor number. Nuance ran the test itself, on its own data, and does not say which rival scored the 35%. The systems it compared against were PersonaPlex, Moshi, GPT-Live and Gemini Live, and the last two were reached through public APIs, so network delay counts against them. Nuance also says on the same page that it does not think benchmarks in this area match what users experience yet. Five minutes talking to Emma will tell you more than the chart does.

How to try it

1. Go to emma.nuancelabs.ai on a laptop. No account is needed.
2. Allow the microphone. Wear headphones and find a quiet room, because Nuance says background voices, a TV or a weak mic all hurt her turn-taking.
3. Interrupt her, trail off mid-sentence, or tell a story and watch her face while you talk. That is where she differs from other avatars.
4. Turn on your camera and ask what she sees. Nuance calls this part "still early."

There is a catch for our neighbors. Emma is open to adults in the US, the EU, the UK and Canada, but Nuance excludes Illinois, Colorado, Connecticut and Texas, plus Quebec. We did not find a reason on the launch page. If you are reading this in the Fox Valley, as we are, you will have to wait or watch the demos.

Nuance has not published pricing for Emma or for the developer side.

What she can't do yet

Nuance lists the gaps itself, which we appreciate:

• She makes factual mistakes, like miscounting the letters in "strawberry."
• She sometimes jumps in too early or waits too long. Long pauses in the middle of a sentence are the hardest case.
• English only.
• Lip sync, gaze and head motion can look off, and her expression can slip back to neutral.

For builders

Developers get the Nuplex Beta API at platform.nuancelabs.ai, with a few ready personas you can brief with your own prompt. Nuance keeps it on a short leash. You cannot clone a real person or upload a face or voice. API video carries a visible watermark. Companion apps are banned, and healthcare and anything involving minors are out of the beta. Calls end automatically if a persona asks for card details, a passcode or money. Custom faces for enterprises are by arrangement only.

What this means for a small business

Nobody should put Emma on a front desk this week. The API is a limited beta, there is no price list, and Illinois is blocked. Still, between this, Muse voice and GPT-Live, we expect the AI that greets a customer to stop feeling like a phone tree fairly soon. When it does, the avatar will be the easy part to buy. What she is connected to, meaning your calendar, your quotes and your follow-ups, is the part you have to build.

That plumbing is worth fixing now, whether or not it ever gets a face. If you want a second set of eyes on where calls and leads slip through, New Face Design offers a free process audit.