Compare 12 options for tasks you use Inworld AI for. Their feature coverage differs; check the summaries and plan details. Real-time voice AI infrastructure for conversational applications
| Tool | Pricing | Score | API | Ongoing free tier | Self-hosting |
|---|---|---|---|---|---|
| Inworld AIthis one Real-time voice AI infrastructure for conversational applications | Contact | 17 | Yes | Unknown | No |
| Convai Build embodied AI characters for virtual worlds and games | Contact | 19 | Yes | Unknown | No |
| Cartesia Real-time voice AI for production applications | Freemium | 65 | Yes | Unknown | No |
| AssemblyAI Production speech AI APIs for transcription and voice agents | Freemium | 118 | Yes | Unknown | No |
| Voice.ai AI voice agents and audio tools for business and creators | Freemium | 5 | Yes | Unknown | Unknown |
| Steno AI Twins that speak for you 24/7 | Contact | 1 | Yes | No | No |
| Deepgram Enterprise voice AI unifying speech-to-text, text-to-speech, and agents | Freemium | 118 | Yes | Unknown | No |
| Charisma.ai Build interactive conversations with AI-powered avatars | Paid | 3 | Unknown | Unknown | No |
| Yoodli AI AI conversation coach for presentations, interviews, and sales pitches | Freemium | 10 | No | Unknown | No |
| Retell AI Build AI voice agents for phone conversations | Freemium | 74 | Yes | Yes | Yes |
| Level AI Enterprise AI for automating customer service operations | Contact | 1 | Unknown | No | No |
| CassetteAI AI-powered generative audio for music, sound effects, and voice | Paid | 1 | Yes | Unknown | No |
| Speak AI AI transcription and conversation analysis platform | Freemium | 0 | Yes | Unknown | No |
Convai is a platform for developers and creators to design and deploy conversational AI characters that live in 3D environments. These characters perceive their surroundings, speak in 500+ voice options across 65+ languages, and respond with realistic animations and emotional depth. It integrates with Unity and Unreal Engine, making it ideal for gaming studios, educational platforms, and brands creating immersive experiences.
Cartesia provides the core infrastructure for building voice-driven systems—combining speech synthesis, speech recognition, and an agent framework. Built for production workloads, it enables enterprises to deploy voice applications for customer service, fraud detection, and real-time conversations that operate at scale.
AssemblyAI provides APIs for developers to transcribe audio, build real-time voice agents, and extract structured insights from speech. The platform handles both pre-recorded and streaming audio with enterprise features including PII redaction, content moderation, and speaker identification. Ideal for teams integrating speech capabilities into customer-facing or internal applications.
Voice.ai is a platform for creating AI-powered voice agents that automate customer calls, combined with text-to-speech, voice cloning, and voice-changing capabilities. Designed for businesses automating support interactions and content creators producing audio content. The platform supports 15+ languages with enterprise-grade security including GDPR and HIPAA compliance.
Create an AI clone trained on your expertise and voice. Deploy across platforms to automate customer conversations, consultations, and engagement—at scale and in your authentic style, without constant involvement.
Deepgram provides unified APIs for building voice-powered applications without integrating separate speech services. It handles real-time and batch transcription, natural speech synthesis, and AI-driven conversational agents across 10 languages. Trusted by enterprises including Twilio, Cloudflare, and IBM for contact center automation, podcast processing, and voice analytics.
Charisma.ai creates immersive conversational experiences powered by realistic AI avatars. It combines dialogue generation with lifelike character interaction to enable skill practice in corporate training, customer engagement, and branded entertainment. The platform handles real-time conversation management and tracks learner engagement automatically.
Yoodli uses interactive AI simulations to help professionals practice speaking skills in realistic scenarios. You receive instant feedback on delivery and performance, with customizable conversation partners for different situations. Ideal for sales teams, executives, and anyone preparing for high-stakes presentations or interviews.
Retell automates inbound and outbound phone conversations with AI agents that sound natural and human-like. Handle appointment booking, customer service, lead qualification, and more. Deploy on Twilio or Vonage infrastructure, or on your own servers for enterprise security.
Level AI is a platform designed for large contact centers to automate and optimize customer interactions at scale. It uses domain-specific AI models to analyze conversations, handle routine inquiries through virtual agents, and provide real-time assistance to human agents. The platform spans quality management, automated case resolution, and performance analytics across voice, chat, and email channels.
CassetteAI generates high-quality audio on demand—music, sound effects, and voice synthesis—all optimized to run on edge devices. Designed for game developers, creators, and real-time applications, it offers lightning-fast rendering with affordable per-use pricing. Streaming-first API makes integration seamless across JavaScript, Python, and cURL.
Speak AI automatically captures, transcribes, and analyzes voice, video, and meeting recordings in 100+ languages with speaker identification. It extracts key themes, sentiment patterns, and custom insights from large conversation volumes, while supporting deployment of AI agents for customer interactions and support workflows. Built for research teams, sales operations, healthcare providers, and agencies processing high volumes of call data.