Your control center for AI voice agents

Stellar's Studio lets you confidently operate your voice AI agents at scale, and comes with built-in tooling to effectively design, test, deploy and monitor enterprise-grade voice AI agents.

Our Agent Editor makes it easy to design and iterate on all aspects of our AI support agents, from personality and dialogue handling, to API integrations and agent-specific guardrails

Test your agent in Stellar's Playground via voice and chat, or use automated test suites to validate against. Easily distribute testing links to testers inside and outside of your organisation

Stellar automates QA for every call using a set of built-in evaluation criteria, and allows defining your own custom evaluation criteria. Post-call summaries, CSAT scoring, transcripts and audio recordings allow you to easily audit your AI agent's performance

Get a tailored demo of Stellar Studio

Transfer to your human agents where needed

Stellar provides granular control over when to transfer to a human agent, for example for specific topics, customers, or circumstances. Even for situations where you prefer a human agent to handle the request, Stellar can already automate some of the grunt work by authenticating the user or determining the correct team to transfer to based on the request.

Teach the AI agent your knowledge and processes

Knowledge retrieval that actually works in production. We've deployed AI agents across regulated industries—healthcare, insurance, finance—and codified what it takes to get reliable answers from your documentation. Let Stellar optimize your knowledge base so your agents get it right the first time.

We work with knowledge in any format: PDFs, databases, websites, and your existing knowledge management system. Your data is stored with enterprise-grade practices and never used to train AI models.

How it works

Take action in your systems

Stellar's agents can be securely integrated with any API-enabled system, to take action and retrieve data on behalf of your customers. Whether that's in your CRM, ticketing system, e-commerce store, or a custom-built API. Our flexible API connector allows connecting to a large number of systems out-of-the-box, and where custom integrations are needed our team can support you.

Examples of actions include:

Interacting with a ticketing system, to open new tickets or inform customers about the status of an ongoing ticket

Authenticating customers before sharing personal info or taking actions, by asking for authentication details and sending these to an authentication endpoint

Helping customers with common account-related issues, such as password resets or (re)sending certain information via email

Reliable guardrail management

Guarding your AI agents against unwanted situations which could put your company or customer experience at risk is Stellar's guardrail system. We run a separate set of AI models on top of our main conversational AI model, to continuously evaluate every new interaction against your configured rules. When a guardrail is triggered, depending on severity Stellar can correct the agent, handover to an employee, or even terminate the conversation.
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‍Stellar agents come built-in with a set of safety guardrails for common customer service scenarios, so you don't have to implement these yourself.

On top of these, we will help you identify and configure your business-specific guardrails. These include which topics are considered off-limits, or which types of customers to automatically redirect to your human agents.

Offer customers multilingual support

Support customers in 50+ languages. Agents detect the caller's language, and can switch automatically to a caller's preferred language if you've allowed the language in your agent's configuration.

Check out more languages in our demo showcase

See full list of supported languages

Automated QA for every call with flexible scoring criteria

Every conversation is automatically evaluated against a set of built-in quality criteria, and you can specify your own evaluation metrics using Stellar's customisable Evaluations . From authentication success rates to strict adherence to your policies, your custom scoring criteria can be used by Stellar to automatically monitor every call and highlight potentially problematic calls. Combined with automated transcripts, call summaries and audio recordings, you can effectively monitor and audit your AI agents at scale

And much more

True conversational AI

Stellar's agents are not limited to pre-defined flows or scripts, and leverage state-of-the-art AI models from the leading AI providers. They can handle complex dialogues, understand customer intent, and understand how to interact with external systems to resolve the customer's request.

Endless scalability - without hassle

Our voice agents operate 24/7, and can scale up instantly to manage any demand spike. Stellar takes care of all the infrastructure challenges for you

AI agent templates optimised for voice-based customer service

Build on top of our agent templates, carefully optimised for audio-based customer service use cases using the latest prompt engineering best practices.

Drastically speed up your path to production, by using our codified knowledge for use cases such as customer authentication, external knowledge access, safe interaction with external systems, staying on-topic, and more

Dedicated expert support - from idea to production

Partner with us and rely on our expertise and hard-earned lessons launching voice AI agents to production in highly regulated enterprise setting.

We can provide service on all fronts required to successfully launch your AI agents to production. Our team has the experience needed to support you on topics such as strategic use case prioritisation, project planning, solution architecture, agent optimisation and change management

Extremely low latency

Stellar offers the lowest latency for voice agents currently available on the market. Paired with advanced turn detection to instantly detect when a user may expect a response, we can offer a more natural conversation experience than traditional voice AI products

Monitoring and reporting

Closely monitor agent performance, audit and replay agent conversations, and surface insights on trending issues across conversations. Prefer to track metrics in your own system? Stellar offers integration with your data warehouse, allowing you to monitor performance directly within your existing setup

Integrated with your existing infrastructure

Stellar's agents can be connected to all major call center platforms, and a large number of phone systems. Worried about integrating Stellar with your complex application landscape and custom APIs? We work closely with you to create any custom integrations needed

Enterprise-grade security

Stellar is ISO27001 certified and fully GDPR compliant.Zero Data Retention and EU Data Residency contracts with our AI providers guarantee your data will never be used for training the AI models. Our platform provides a sophisticated set of safety mechanisms to protect your systems and AI agents against common attack vectors.

Features