20 Cartesia alternatives
Cartesia: Ultra-low-latency speech models built for real-time voice agents, where every millisecond is audible. 20 apps do similar work, most sharing API, Developers and Voice Agents, ranked by how much they have in common with Cartesia.
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Enterprise speech infrastructure — fast, accurate transcription, text to speech, and a full voice agent API.
Also: API, Developers, Text-to-Speech, Transcription, Voice Agents
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Low-latency speech APIs from the team behind the open-source Dia model — text-to-speech and transcription priced well below the incumbents.
Also: API, Text-to-Speech, Transcription, Voice Agents
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A router for voice models: 56 speech and language models benchmarked across 10 languages, with each session sent to the one that actually wins.
Also: API, Text-to-Speech, Transcription, Voice Agents
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AgentCall
Free, fully on-device voice loop for AI coding agents — talk to Claude Code, Cursor or Codex and hear them answer back out loud.
Also: Developers, Text-to-Speech, Transcription, Voice Agents
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Voice AI that reads and expresses emotion — speech models trained on human vocal expression, not just phonemes.
Also: API, Developers, Text-to-Speech, Voice Agents
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MeetStream AI
One API for meeting bots across Zoom, Google Meet, Teams and Webex — join, record, stream and speak in real time, billed at $0.35 an hour.
Also: API, Developers, Transcription, Voice Agents
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Developer platform for AI agents on Apple's own channels — programmable iMessage at scale, plus video agents that answer and place FaceTime calls in a few lines of code.
Also: API, Developers, Voice Agents
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A developer platform for voice agents that make and take phone calls, with sub-second turn latency.
Also: API, Developers, Voice Agents
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Speech-to-text APIs with built-in understanding — transcription plus summaries, topics, and redaction in one call.
Also: API, Developers, Transcription
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Palash Deb
Open-source, fully local voice AI studio for macOS, Windows and Linux — voice cloning, voice design, dubbing, dictation and transcription in 646 languages.
Also: Text-to-Speech, Transcription
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Generate lifelike spoken audio with AI tools
Also: API, Text-to-Speech
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Readwise
Read-it-later app for articles, PDFs, EPUBs, newsletters, RSS and YouTube, with highlighting, AI chat and sync to Readwise reviews.
Also: API, Text-to-Speech
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AI avatar platform for scripted presenter videos and real-time conversational visual agents, with voice cloning and an API.
Also: API, Text-to-Speech
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Interface, Inc.
AI receptionist and second work number for local service businesses — answers calls 24/7, transcribes everything, and turns each conversation into summaries and next steps.
Also: Transcription, Voice Agents
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Tatva Labs Inc.
Continuous automated QA for voice and chat AI agents, from pre-launch simulation to live call monitoring.
Also: Developers, Voice Agents
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Cleanvoice AI
AI editor that removes filler words, silences, mouth sounds and background noise from podcasts and voice recordings, with timeline export.
Also: API, Transcription
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Google
Google's browser workbench for prototyping with Gemini models, then shipping the same prompt as production API code.
Also: API, Developers
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One API and one bill for hundreds of language models, with automatic failover between providers.
Also: API, Developers
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One API for agent harnesses — run Codex, Claude Code or Hermes behind your product with shared sessions, streaming, files and cost controls, and swap harness with a config change.
Also: API, Developers
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Privacy-first AI gateway putting 600+ models from 90+ providers behind one OpenAI-compatible API, with no prompt or output logging.
Also: API, Developers