Best Free AI Voice Agents of 2025

Dialogflow by Google Cloud is a natural-language understanding platform that allows you to create and integrate a conversational interface into your mobile, web, or device. It also makes it easy for you to integrate a bot, interactive voice response system, or other type of user interface into your app, web, or mobile application. Dialogflow allows you to create new ways for customers to interact with your product. Dialogflow can analyze input from customers in multiple formats, including text and audio (such as voice or phone calls). Dialogflow can also respond to customers via text or synthetic speech. Dialogflow CX, ES offer virtual agent services for chatbots or contact centers. Agent Assist can be used to assist human agents in contact centers that have them. Agent Assist offers real-time suggestions to human agents, even while they are talking with customers.

The most versatile and realistic AI speech software ever. Eleven delivers the most convincing, rich and authentic voices to creators and publishers looking for the ultimate tools for storytelling. The most versatile and versatile AI speech tool available allows you to produce high-quality spoken audio in any style and voice. Our deep learning model can detect human intonation and inflections and adjust delivery based upon context. Our AI model is designed to understand the logic and emotions behind words. Instead of generating sentences one-by-1, the AI model is always aware of how each utterance links to preceding or succeeding text. This zoomed-out perspective allows it a more convincing and purposeful way to intone longer fragments. Finally, you can do it with any voice you like.

Voice AI for any application. Vapi allows developers to build, test and deploy Voicebots in just minutes instead of months. Solutions for everything You can build a customer support system, telehealth system, front desk, lead generation, food ordering system, transportation logistics, employee education, roleplay or anything else you like. We make voice AI as simple, reliable and accessible as any API in your stack. All the power and all the customizability. Plug in any model and speak to it anywhere.

IBM watsonx Assistant is a next-gen conversational AI solution—it that empowers a broader audience that includes non-technical business users, anyone in your organization to effortlessly build generative AI Assistants that deliver frictionless self-service experiences to customers across any device or channel, help boost employee productivity, and scale across your business. -User-friendly interface with drag-and-drop conversation builder and pre-built templates. -Out-of-the-box Large Language Models, Large Speech Models, Natural Language Processing and Understanding (NLP, NLU), and Intelligent Context Gathering, to better understand the context of each conversation in natural language. -Retrieval-augmented generation (RAG) for accurate, contextual, and up-to-date conversational answers around the clock, grounded in your company's knowledge base.

Welcome to TENIOS, the cloud communications provider of the Apifonica Group. TENIOS is German-based and specializes in cutting-edge AI voicebots and telephony solutions for businesses. Their mission in short words: Bringing Conversational AI to the world. Their passion for automation unites a team of experts in Cloud Technology, Telephony, and AI to help businesses automate communication and related business workflows. TENIOS Voicebots handle outbound and inbound calls, call back leads, pre-qualifiy them, instantly update CRM data, and create reports to scale customer communications. The comprehensive telecom-platform offers services such as virtual phone numbers, intelligent call routing, interactive voice response (IVR) systems, SMS, RCS, and a robust Voice API for seamless integration of voice applications. With over two decades of experience and hosting in Germany, TENIOS ensures reliable and scalable communication solutions tailored to meet diverse business needs.

Aisera is at the forefront of innovation. It has introduced a revolutionary solution which redefines how businesses and customers thrive. Aisera's cutting-edge AI offers a proactive experience that is personalized and predictive. It automates support and operations across many sectors, including HR and IT, sales and customer service. Aisera empowers its users by providing self-service solutions that are similar to those offered by consumers. Aisera accelerates your journey to a more streamlined future by unleashing the power of digitalization. Aisera automates tasks, actions and critical business processes by leveraging user and service behavioral insights. Aisera seamlessly integrates with leading platforms like Salesforce, Zendesk and ServiceNow. It also works with Microsoft, Adobe, Oracle SAP, Marketo Hubspot and Okta.

Forethought is the most advanced generative AI agent for customer support and your 24/7 AI team member. Trained on your unique data sets and upholding the highest security protocols, Forethought delivers natural conversations through AI and eliminates inefficiencies to improve response times, resolution rates, and customer satisfaction scores at every interaction. - Add an AI Agent that is a 24/7 team member, reducing workload so your team can focus on delivering exceptional support. - Only Forethought ingests historical and current ticket data for AI specific to your business needs to deliver a personalized experience. - We're not just about meeting privacy standards – we're setting them, to keep you and your data secure every step of the way.

Teams leverage Voiceflow to collaboratively design, test, and deploy conversational assistants more efficiently and at scale. With the platform, users can develop chat and voice interfaces for any digital product or conversational assistant seamlessly. It integrates various disciplines such as conversation design, product development, copywriting, and legal considerations into one cohesive process. Users can design, prototype, test, iterate, launch, and measure all within a single platform, eliminating functional silos and content disarray. Voiceflow empowers teams to operate within an interactive workspace that unifies all assistant-related data, including conversation flows, intents, utterances, response content, API calls, and additional elements. The platform's one-click prototyping feature helps avoid delays and extensive development efforts, allowing designers to create shareable, high-fidelity prototypes in just minutes to refine the user experience effectively. As the preferred choice for enhancing the speed and scalability of app delivery, Voiceflow also accelerates workflows with features such as drag-and-drop design, rapid prototyping, real-time feedback, and pre-built code, further streamlining the development process for teams. By harnessing these powerful tools, teams can significantly improve their collaborative efforts and optimize the overall quality of their conversational projects.

LiveKit is a real-time communication platform that empowers developers to integrate video, voice, and data functionalities into their applications seamlessly. Utilizing WebRTC technology, it caters to a wide array of frontend and backend frameworks. The network architecture of LiveKit is meticulously designed to ensure ultra-low latency, exceptional resilience, and the capacity to scale massively. Our globally distributed team oversees an infrastructure that processes billions of audio and video minutes monthly, demonstrating our extensive reach. The platform offers SDK support for all leading platforms, enabling developers to create their applications with a LiveKit client that is natively tailored to their chosen environment. Moreover, LiveKit allows for self-hosting at no cost, requiring no modifications to your code since the entire suite of tools and services adheres to the Apache 2.0 open-source license. With a plethora of features, LiveKit includes single sign-on (SSO) and role-based access control (RBAC) for teams, robust security measures such as end-to-end encryption, as well as tools for noise and echo cancellation, session recording, stream ingestion, and moderation, making it an ideal choice for developers. In essence, LiveKit stands out as an all-encompassing solution for real-time communications, providing everything needed to build highly interactive applications.

Vocode is an open-source library designed to streamline the development of voice-driven applications that utilize large language models. It enables developers to create interactive, real-time conversations with LLMs and implement them in various settings such as phone calls and Zoom meetings. With a focus on user-friendliness, Vocode offers a comprehensive set of abstractions and integrations, consolidating all essential tools within a single library. The platform includes ready-to-use integrations with top speech-to-text and text-to-speech services, such as AssemblyAI, Deepgram, Google Cloud, Microsoft Azure, and Whisper. Supporting deployment across multiple platforms—including telephony, web, and Zoom—Vocode facilitates the creation of applications ranging from LLM-enhanced phone calls to personal assistants and voice-activated games. Its modular architecture allows for the smooth incorporation of diverse AI models and services, granting developers the freedom to select the optimal components for their specific needs. Additionally, Vocode is equipped with multilingual features, making it suitable for a global audience. This versatility opens new avenues for innovative applications in various industries.

Krybe is an innovative platform utilizing AI to deliver advanced voice and transcription services, featuring voice agents and speech AI that convert background noise into valuable insights for both businesses and individuals. Users can enjoy a complimentary 60 minutes of transcription and handle up to 5,000 characters of text without needing to enter credit card information, and they have the option to cancel anytime. With a focus on preserving a distinct brand voice across various channels, Krybe's offerings enable narration, automation, and personalized experiences. The platform is designed to simplify workflows, boost productivity, and allow users to scale their operations effortlessly. Krybe's voice agents integrate smoothly with current systems, acting as virtual human assistants to streamline business functions. You can even listen to an actual customer service exchange managed flawlessly by our AI voice agent. Additionally, the platform allows for real-time speech-to-text conversion, ensuring that you capture every detail while remaining fully engaged in conversations and discussions. Ultimately, Krybe empowers users to harness the full potential of voice technology for improved communication and efficiency.

You can use accurate speech recognition at scale and continuously improve model performance by labeling data, training and labeling from one console. We provide state-of the-art speech recognition and understanding at large scale. We do this by offering cutting-edge model training, data-labeling, and flexible deployment options. Our platform recognizes multiple languages and accents. It dynamically adapts to your business' needs with each training session. Enterprise-specific speech transcription software that is fast, accurate, reliable, and scalable. ASR has been reinvented with 100% deep learning, which allows companies to improve their accuracy. Stop waiting for big tech companies to improve their software. Instead, force your developers to manually increase accuracy by using keywords in every API call. You can train your speech model now and reap the benefits in weeks, instead of months or even years.

Create intelligent chatbots, AI-driven voice calls, and functionalities for voice assistants that accurately interpret your customers' intentions. Enhance your lead generation efforts through various platforms including messengers, websites, and social media. These chatbots are capable of autonomously handling up to 80% of standard inquiries. If required, they can seamlessly escalate conversations to a human expert. Additionally, chatbots are equipped to facilitate payment processing and broaden your sales funnel. They gather customer feedback, enabling you to refine the overall user experience. Furthermore, chatbots can send reminders for abandoned shopping carts, alert customers about promotions, and announce the arrival of new products. By understanding intents, chatbots are able to discern issues, identify customer concerns, and respond based on predetermined scenarios. The chatbot developed by Aimylogic is adept at recognizing various expressions such as greetings, farewells, agreement, disagreement, appreciation, and even negative language. Simply add the desired block into the scenario to customize the chatbot's responses further. This adaptability ensures that your customer interactions are both efficient and engaging.

Our platform is designed alongside groundbreaking scientific advancements that uncover how individuals perceive and articulate over 30 unique emotions. The ability to comprehend and convey emotions effectively is essential for the advancement of voice assistants, health technologies, social media platforms, and numerous other fields. It is vital that AI applications are rooted in collaborative, thorough, and inclusive scientific practices. Treating human emotions as mere tools for AI's objectives must be avoided, ensuring that the advantages of AI are accessible to individuals from a variety of backgrounds. Those impacted by AI should possess sufficient information to make informed choices regarding its implementation. Furthermore, the deployment of AI must occur only with the explicit and informed consent of those it influences, fostering a greater sense of trust and ethical responsibility in its use. Ultimately, prioritizing emotional intelligence in AI development will enrich user experiences and enhance interpersonal connections.

Lindy, an AI-powered assistant, is designed to streamline professional tasks. It integrates seamlessly with numerous applications including Gmail, Zoom and Twilio. It allows users to automate workflows, such as email management and customer support, scheduling and CRM data entry. Lindy's intuitive interface allows users to create AI agents within minutes, automating complex processes without coding expertise. Lindy also offers templates that can be customized to meet specific needs. For example, it is able to convert real-time interactions between clinicians and patients into accurate, comprehensive notes. Lindy allows professionals to focus on the most important aspects of their job, while ensuring that routine tasks are handled efficiently.

Sonic stands out as the premier generative voice API, offering ultra-realistic audio powered by an advanced state space model tailored specifically for developers. With an impressive time-to-first audio response of just 90 milliseconds, it delivers unmatched performance while ensuring top-tier quality and control. Designed for seamless streaming, Sonic employs an innovative low-latency state space model stack. Users can precisely adjust pitch, speed, emotion, and pronunciation, granting them fine-tuned control over their audio outputs. In independent assessments, Sonic consistently ranks as the top choice for quality. The API supports fluid speech in 13 languages, with additional languages being introduced with each update, ensuring broad accessibility. Whether you need Japanese or German, Sonic has you covered, allowing for voice localization to suit any accent or dialect. Enhance customer support experiences that truly impress and capture your audience's attention with captivating storytelling through rich, immersive voices. From engaging podcasts to informative news pieces, Sonic empowers various sectors, including healthcare, by providing trustworthy voices that resonate with patients. Additionally, the flexibility of Sonic opens up new avenues for content creation that not only captivates viewers but also drives significant engagement.

Curious Thing is an advanced voice AI assistant crafted to enhance business interactions by proactively connecting with customers through phone calls. It skillfully both initiates and receives calls, identifies and leaves voicemails, and communicates via dynamic SMS, emails, and instant messages. Additionally, this AI assistant is adept at managing appointment bookings, changes, or cancellations, integrating smoothly with existing systems to maximize scheduling effectiveness. By employing open-ended questions, it collects valuable insights that empower businesses to make informed, data-driven choices. The capabilities of Curious Thing allow organizations to elevate their service capacity and enrich customer engagement. Furthermore, it provides unlimited call summaries, offering brief overviews of conversations through text or email, making it easier for teams to stay informed. Tailored for businesses of all sizes, Curious Thing's voice AI assistant not only answers incoming calls but also schedules meetings and addresses frequently asked questions, thereby streamlining overall communication. Ultimately, this innovative tool represents a significant advancement in how businesses can interact with their customers efficiently and effectively.

Assindo is an advanced AI assistant created to streamline your phone call management, enabling you to concentrate on what truly counts. It efficiently takes care of incoming calls, initiates important conversations on your behalf, and automates tasks like scheduling appointments and handling customer service inquiries. Assindo expertly navigates through phone menus, manages hold times, screens calls, and records messages when you're not available. It also extracts essential information from incoming calls, transforms those insights into actionable tasks, and monitors the progress of completed tasks to maintain high efficiency. With a selection of seven distinct AI assistant personalities available, such as Elena, who embodies determination, and Liam, who prioritizes efficiency, Assindo customizes its offerings to match your individual preferences. You have the ability to interact directly with your AI assistant to share updates, issue new directives, or receive comprehensive real-time updates on your tasks, ensuring seamless communication and productivity. This personalized approach enhances your overall experience and helps you manage your time more effectively.

Bonnie functions as an AI-driven virtual receptionist tailored to enhance and simplify customer service for small enterprises. By efficiently managing phone calls and WhatsApp communications, Bonnie guarantees that no potential customer is overlooked, even during peak times. The system not only oversees bookings and offers round-the-clock customer support but also provides daily updates to help businesses remain organized. Furthermore, with seamless integration into existing booking platforms and customer relationship management systems, Bonnie elevates customer satisfaction levels while enabling business owners to concentrate on their core objectives, thereby saving time and driving sales growth. Ultimately, this innovative solution empowers small businesses to operate more efficiently in a competitive landscape.

hellomybot.io serves as an exceptional omnichannel bot platform (SaaS) designed for both businesses and developers eager to build various types of conversational agents, including voice bots and chatbots. With endless opportunities at your disposal, you can manage web traffic, facilitate web-to-store interactions, enhance consumer acquisition, foster competition, provide customer services, host events, and create conversational forms. Enable your bot to comprehend unique queries, whether spoken or typed, and engage users in tailored dialogues. This ensures that every user interaction is customized to their needs. Your bot provides immediate responses, operating tirelessly every day while you maintain control over all communications. Engage directly with your audience through your conversational agents platform, which integrates seamlessly with your email and helpdesk systems. Connect with your target audience across various platforms, leveraging the unique features of each to enhance your outreach. Experience global communication through messaging applications with hellomybot, allowing you to maximize engagement and effectiveness. Furthermore, this platform empowers you to innovate your customer interactions, ensuring that you remain at the forefront of conversational technology.