What is Hume AI? A practical 2025 overview of empathic voice AI

Let’s be honest, most AI assistants sound like they’ve had a personality bypass. We’re all too familiar with those robotic, monotone voices. But we’re finally starting to move into a world where AI can sound genuinely happy, sympathetic, or maybe even a little bit sarcastic. A company called Hume AI is at the forefront of this shift, building what they call "empathic" AI that can understand and express emotion through voice.

So, what does this actually mean for a business looking to use this tech? This article is a practical, no-fluff guide to what Hume AI is, how it works, where it shines, and where it hits a wall. We’ll get into its features, pricing, and why an expressive voice is just one piece of a much larger puzzle when it comes to business automation.

What is Hume AI?

At its heart, Hume AI is a research lab and tech company focused on AI that can understand and generate human-like emotional speech. Think of it as more than just another text-to-speech (TTS) engine that reads words off a page. It’s built on a voice-based large language model (LLM) they call Octave, which is designed to pick up on the meaning and emotional tone of words to deliver them in a way that sounds natural.

The whole idea is rooted in a field called "affective computing," which is all about creating systems that can recognize, interpret, and even simulate human emotions. Hume AI’s goal is to build technology that feels more aligned with our well-being by giving it a bit of emotional intelligence. As a WIRED review pointed out, it doesn’t just talk with feeling; it also listens to your vocal tones to pick up on emotional cues. This makes the whole interaction feel less like you’re talking to a machine and more like a real conversation.

Key features of Hume AI

Hume AI offers a set of tools aimed mostly at developers and creators who want to build unique, emotionally aware voice experiences from the ground up.

Empathic Voice Interface (EVI)

The Empathic Voice Interface (or EVI) is Hume’s main attraction. It’s an API that lets developers create real-time, emotionally expressive conversations with an AI. You can hook it into other LLMs from places like OpenAI or Anthropic to give them a voice that sounds way more human. The cool part is that it’s a two-way street: the EVI not only speaks with emotion but also listeners for it, analyzing your voice for signs of happiness, anxiety, or determination.

Hume's Empathic Voice Interface (EVI) is the first conversational AI with emotional intelligence, understanding the user's tone to optimize its own expression.

Octave TTS and voice design

This is where the creative side of Hume AI really comes to life. Its text-to-speech engine lets you dream up unique voices from simple text prompts. If you hop over to their website, you can play around with examples that range from "a grizzled old cowboy with a folksy Texan drawl" to "a villainous undead vampire."

You can even give the AI acting directions. You could tell a voice to "sound more sarcastic" or to "whisper fearfully," which gives you a level of control that feels more like you’re directing a voice actor than programming a machine.

A toolkit for developers

It’s really important to know who Hume AI is for right now: developers. The platform gives you APIs, a React SDK, and even a Vercel starter template to help technical folks build its voice tech into their own apps. These tools are incredibly powerful for custom projects, but they require a lot of development work to become a useful business application. Think of it as a box of high-tech Lego bricks, not a fully-built castle.

Use cases and limitations for businesses

The technology is impressive, but how does it actually hold up in a day-to-day business setting? Let’s break down where it could be a perfect fit and where it misses the mark for most companies.

Potential use cases

Hume AI is a fantastic tool for creative fields where emotional delivery is everything. Here are a few spots where it would feel right at home:

• Content & Entertainment: Imagine creating dynamic, emotionally rich voiceovers for podcasts, audiobooks, or characters in a video game.

• Marketing & Branding: You could develop unique voices for brand mascots or ads that actually connect with people on an emotional level.

• Future-Facing Applications: It’s easy to see the potential for things like AI-powered mental health companions or personal assistants that can offer what sounds like genuine empathy.

Limitations for customer support

When it comes to a business function like customer support, having an expressive voice is nice, but it’s just the tip of the iceberg. The real work is connecting that voice to your company’s knowledge, processes, and tools. This is where Hume AI’s limitations become pretty clear.

It’s a voice without any business context. Hume AI can sound empathetic when a customer is upset, but it doesn’t know your return policy, how to check on an order, or what to do when an issue needs to be passed up the chain.

All the heavy lifting is on you. If you wanted to use Hume for customer support, your engineering team would have to build a pretty complicated system from scratch. This would involve:

1. Connecting it to all your knowledge sources (think help articles, past tickets, internal wikis).

2. Integrating it with your helpdesk, whether that’s Zendesk or Freshdesk.

3. Writing custom code for every single business task, from looking up order details in your backend to tagging and routing support tickets correctly.

While Hume AI gives you a sophisticated voice layer, a solution like eesel AI delivers the complete system for support automation right out of the box. It plugs into all your knowledge sources, from past tickets to your Confluence pages, and has a no-code workflow builder to handle real business tasks. This means teams can get an AI agent up and running to automate responses and triage tickets in minutes, not months.

Pricing explained

Hume AI operates on a tiered subscription model that also includes usage-based pricing for its text-to-speech and EVI products. It’s a model that’s easy to start with but can get expensive as you grow.

Subscription plans

Here’s a look at Hume AI’s plans, based on their official pricing page.

Plan	Monthly Price	Included Characters (TTS) / Minutes (EVI)	Key Features
Free	$0	10,000 characters / 5 mins EVI	Basic access, 15 RPM
Starter	$3	30,000 characters / 40 mins EVI	20 projects
Creator	$14	140,000 characters / 200 mins EVI	Unlimited voice cloning (create & use)
Pro	$70	1,000,000 characters / 1,200 mins EVI	75 RPM, 3,000 projects
Scale	$200	3,300,000 characters / 5,000 mins EVI	150 RPM, 10,000 projects
Business	$500	10,000,000 characters / 12,500 mins EVI	225 RPM, 20,000 projects
Enterprise	Custom	Custom	Custom RPM, SOC 2, Slack support

Source: Hume AI Pricing Page

What this pricing means for your business

A usage-based model tied to characters and minutes can be a bit of a headache for high-volume teams like customer support. A busy month with a surge in customer questions could lead to a surprisingly big bill, making your costs hard to predict.

On top of that, this pricing only covers the Hume AI service. It doesn’t include what you’ll pay for the underlying LLM needed to power the conversation, and it certainly doesn’t account for the developer salaries and server costs required to build and maintain the application.

This is a different world from the predictable, all-inclusive pricing you see with platforms like eesel AI. Our plans are based on a set number of AI interactions and include everything you need, so you don’t have to worry about per-ticket fees or surprise costs as your support volume grows.

The verdict on Hume AI: A powerful tool, but not a full business solution

Hume AI is, without a doubt, a cool piece of technology. It’s pushing the boundaries of how we interact with AI by giving it an emotional and incredibly flexible voice. It’s a huge step toward making AI feel less, well, artificial.

But at the end of the day, it’s a powerful tool for developers, not a ready-to-go solution for business teams like customer service or IT support. The gap between its impressive voice and a working, integrated business process is a big one that requires a serious investment in time and technical expertise.

For teams that need to solve immediate business problems, like cutting down on ticket volume, making agents more efficient, and giving customers instant answers, a dedicated automation platform is the way to go. A platform like eesel AI is built to be radically simple and self-serve. It integrates with the tools you already use and can start delivering results on day one. You can even simulate its impact on your past tickets and launch a fully working AI agent in just a few minutes.