Best Free AI Voice Agents of 2025

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.

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.

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 leading the charge in innovation by launching a groundbreaking solution that transforms the dynamics between businesses and their customers. Utilizing state-of-the-art AI technology, Aisera delivers a proactive, tailored, and foresighted experience that streamlines operations and support in diverse fields such as HR, IT, sales, and customer service. By offering user-friendly self-service resolutions reminiscent of consumer-grade solutions, Aisera not only empowers its users but also enhances their success. By harnessing the potential of digital transformation, Aisera expedites the transition towards a more efficient future. Through the incorporation of user and service behavioral intelligence, Aisera facilitates the complete automation of tasks, actions, and essential business processes. By seamlessly connecting with top-tier platforms like Salesforce, Zendesk, ServiceNow, Microsoft, Adobe, Oracle, SAP, Marketo, Hubspot, and Okta, Aisera delivers significant business value while setting new standards in operational excellence. This innovative approach not only simplifies workflows but also enhances overall productivity across various sectors.

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.

CogniAgent is a next-generation conversational AI platform that mirrors expert human knowledge to automate and manage intricate business workflows across departments. It offers voice-enabled, emotion-sensitive interactions that dynamically adjust tone and response based on real-time sentiment analysis, creating empathetic and engaging dialogues. The platform integrates seamlessly with over 2,500 existing software tools and data formats such as PDFs, videos, websites, and spreadsheets, requiring no complex technical setup. Its sophisticated six-layer architecture handles multi-source data ingestion, processing, and real-time decision-making to support adaptive problem-solving beyond rigid workflows. CogniAgent delivers measurable business impact, including a 35% increase in operational efficiency and a 40% reduction in customer service costs. Its AI agents automate tasks across customer support, sales, HR, finance, legal, and supply chain functions. By enabling 24/7 AI workforce capabilities, CogniAgent reduces operational costs while maintaining consistent, high-quality performance. The platform’s security framework ensures enterprise-grade compliance and privacy protections.

Create chatbots, AI-driven calls, and functionalities for voice assistants that can comprehend your customers' intentions. Enhance lead collection from various platforms such as messengers, websites, and social media. These chatbots are capable of autonomously handling up to 80% of standard inquiries. When necessary, they can seamlessly transfer the dialogue to a human expert. Additionally, chatbots can facilitate payment processes and further broaden the sales funnel. They gather user feedback to help refine the overall user experience. Furthermore, chatbots can send reminders about abandoned carts, inform users about exclusive promotions, and announce the arrival of new products. By recognizing intents, chatbots can effectively interpret issues, pinpoint customer problems, and respond according to predetermined scenarios. The chatbot developed by Aimylogic is adept at recognizing various interactions, including greetings, farewells, affirmative and negative responses, expressions of gratitude, and even profanity. Simply integrate the desired block into your scenario to customize its functionality even further. This flexibility makes it easier to cater to diverse customer needs and improve engagement.

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.

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.

Assindo is an innovative AI assistant that streamlines your phone call management, enabling you to concentrate on what truly matters in your life. It efficiently handles incoming calls, initiates significant calls for you, and automates outgoing communications such as appointment scheduling and customer service inquiries. Assindo expertly navigates through phone menus, patiently waits on hold, screens calls, and takes messages when you are not available. It also captures key information from incoming calls, transforms these details into actionable tasks, and keeps a record of completed tasks to enhance productivity. With seven distinct AI personalities, including the resolute Elena and the highly efficient Liam, Assindo customizes its offerings to fit your individual preferences. You have the ability to interact directly with your assistant to provide updates, issue new directives, or receive real-time updates on your tasks, making it an indispensable tool for enhancing your daily efficiency. This level of personalized assistance ensures that you never miss important details and stay on top of your commitments.

Genspark offers a powerful AI platform designed to assist in creating content and automating complex tasks, such as generating videos and images or conducting in-depth research. The Genspark Super Agent elevates the platform’s capabilities by handling a variety of personal and professional tasks, such as gift selection, travel planning, and restaurant reservations. Users can leverage the platform’s AI tools to produce creative content, analyze data, and automate daily processes with minimal effort, all powered by the versatile Super Agent.

ServiceAgent is an innovative AI-driven call answering solution designed for home service businesses, ensuring that no potential lead is overlooked by managing incoming calls around the clock and scheduling appointments. With this persistent AI agent, your business can thrive continuously, as it efficiently answers calls, secures appointments, and transforms leads into tangible opportunities, unlike your competitors who miss out on valuable service calls daily. The human-like voice interface of ServiceAgent guarantees that all incoming inquiries are addressed promptly, even during late hours and holidays, so you can rest easy knowing leads are captured. Never again will you miss a valuable opportunity; our AI agent diligently manages inbound requests at any time, recording essential information to keep your business accessible at all times. You will receive clear summaries and comprehensive transcripts of every conversation, allowing you to monitor follow-up tasks with precision and ensure nothing falls through the cracks. Callers will find it easy to book appointments immediately, with automatic SMS confirmations that synchronize your schedule and help minimize no-shows, ultimately enhancing your operational efficiency. Thanks to ServiceAgent, you can focus on what you do best while we handle the calls that keep your business flourishing.

CallSnag is a smart AI voice receptionist that answers, screens, and responds to your calls just like a human would, allowing you to stay connected without the pressure to pick up every call. You can continue using your existing phone number while CallSnag takes over when you’re unavailable. The AI handles missed calls and delivers summaries, ensuring you’re always updated on important conversations. Whether for personal or business use, CallSnag provides customizable responses to callers, giving you full control over your communication. The platform is designed to simplify your call management, so you can focus on other tasks without worrying about missing out on important calls.

Smallest.ai is an innovative AI platform that specializes in delivering highly personalized voice experiences in real-time, characterized by low latency and impressive scalability. Its premier offerings, Waves and Atoms, empower users to create lifelike AI voices and implement real-time AI agents for engaging customer interactions. With ultra-realistic text-to-speech functionalities, Waves supports a diverse range of over 30 languages and 100 accents, achieving an API latency of less than 100 milliseconds for immediate voice generation. Additionally, it includes a voice cloning feature that allows users to mimic any voice using just a brief 5-second audio clip, making it perfect for tailored branding and content production. Atoms is designed to provide AI agents that manage customer calls, facilitating smooth and natural conversations without the need for human assistance. Both offerings are crafted for straightforward integration, featuring scalable APIs and Python SDKs that ease their deployment across various platforms, ensuring a versatile solution for businesses looking to enhance their customer engagement. This adaptability makes Smallest.ai a valuable asset for companies aiming to incorporate advanced voice technology into their operations.

Chikka.ai is an innovative platform that leverages artificial intelligence for voice interviews, featuring "Ava," a highly empathetic and multilingual AI voice agent capable of conducting engaging and natural conversations on a large scale. Users can easily set their goals, send out invitations through a shareable link, and let Ava guide the dialogue while securely gathering genuine feedback. The platform quickly transforms audio recordings into text transcripts, emotional insights, concise summaries, shareable quote visuals, and credible marketing testimonials, all verified through its VoiceVerify system. Chikka.ai can handle hundreds of interviews simultaneously and provides synthetic persona test runs, access to global respondent panels, and strong privacy measures that include encryption and identity masking. Additionally, real-time analytics and theme detection empower teams to identify hidden opportunities, enhance retention rates, better understand product-market fit, improve employee engagement, and create effective content-driven marketing strategies. By utilizing such advanced features, Chikka.ai is not only making interviews more efficient but also enriching the overall decision-making process for businesses.

VoiceBun is a user-friendly, open-source platform designed for creating and managing voice agents without any coding requirements, enabling users to build AI-driven conversational assistants simply by using natural language prompts. This innovative tool seamlessly integrates speech recognition, extensive language models, and voice synthesis within a single framework, allowing you to set your agent's objectives, initial greetings, and connect various tools and data sources; as a result, VoiceBun autonomously generates the necessary conversational structures, state management, and API links to effectively manage incoming and outgoing communications for customer support, appointment scheduling, lead qualification, and various other tasks. Accessible through a web-based interface, it offers mobile compatibility and individualized deployments using user-specific subdomains, while its built-in analytics feature reveals call transcripts, usage statistics, success rates, and sentiment analysis trends. Furthermore, the platform supports various integrations, including telephony options, webhook actions for external processes, and role-based access controls, all safeguarded with encrypted credentials to ensure robust enterprise-level security. With VoiceBun, even those without technical expertise can easily create powerful voice agents tailored to their specific needs.

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.

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.

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.

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.