Compare 12 options for tasks you use Cartesia for. Their feature coverage differs; check the summaries and plan details. Real-time voice AI for production applications
| Tool | Pricing | Score | API | Ongoing free tier | Self-hosting |
|---|---|---|---|---|---|
| Cartesiathis one 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 |
| Inworld AI Real-time voice AI infrastructure for conversational applications | Contact | 17 | Yes | Unknown | No |
| CassetteAI AI-powered generative audio for music, sound effects, and voice | Paid | 1 | Yes | Unknown | No |
| Praktika AI Learn languages through conversations with adaptive AI tutors | Freemium | 3 | Unknown | Unknown | No |
| Hume AI Real-time emotional metrics for voice AI evaluation | Freemium | 65 | Yes | Unknown | No |
| Speak AI AI transcription and conversation analysis platform | Freemium | 0 | Yes | Unknown | No |
| Charisma.ai Build interactive conversations with AI-powered avatars | Paid | 3 | Unknown | Unknown | No |
| Deepgram Enterprise voice AI unifying speech-to-text, text-to-speech, and agents | Freemium | 118 | Yes | Unknown | No |
| AI Coustics Clean audio for smarter voice AI systems | Freemium | 9 | Unknown | Unknown | No |
| Krater All your AI tools in one workspace | Paid | 1 | Unknown | Unknown | No |
| SpeechEasy AI-powered text-to-speech for voiceovers and audio content | Freemium | 2 | Unknown | Unknown | No |
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.
Inworld AI is a platform for building voice-enabled conversational experiences at scale. It combines speech synthesis, speech recognition, voice cloning, and LLM orchestration into a unified API, eliminating the need to integrate multiple vendors. Developers can deploy interactive voice agents for customer support, entertainment, language learning, and AI companions.
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.
Praktika connects you with personalized AI tutors for real-time conversational language practice. Each session adjusts to your current level and interests, delivering instant feedback on pronunciation, grammar, and word choice. Whether you want to improve speaking, listening, reading, or vocabulary, the AI guides you through exercises tailored to your pace.
Hume AI provides a platform and API suite for evaluating emotionally intelligent voice and conversational AI systems. It combines real-time emotion detection supporting 48+ emotions across 50+ languages with performance metrics and human evaluation workflows. Designed for teams building advanced voice interfaces and speech-based AI products.
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.
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.
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.
AI Coustics is an audio processing platform that improves voice AI accuracy by cleaning and enhancing incoming audio before it reaches speech recognition models. It offers speech enhancement, voice activity detection, and speaker isolation tools, all optimized for low-latency production environments. Used by voice agent developers across 187 countries.
Krater consolidates access to 350+ AI models—from ChatGPT to Claude and Gemini—alongside integrations with 300+ apps like Gmail, Slack, and Notion. Instead of juggling multiple subscriptions and interfaces, you work from a single platform with AI agents, code generation, image and video creation, and voice tools. Teams and individual creators use it to streamline workflows and cut costs.
SpeechEasy converts written text into natural-sounding synthetic audio using advanced AI technology. The platform offers multiple high-quality voice options and runs seamlessly across desktop and mobile devices. It's designed for video creators, educators, and publishers who need professional voiceovers without lengthy recording sessions.