Retell AI
Audio & Voice
Deploy AI voice agents with 95.7% workflow accuracy for phone call automation.
- Voice Agents
- AI Call Center
- Compliance
Paid
Best speech-to-speech Alternatives in 2026
speech-to-speech: Builds voice agents using open-source models. Here are 12 alternatives — compare pricing, free plans and API access side by side.
speech-to-speech vs. alternatives
| Tool | Category | Pricing | Starting at | Free plan | API | Open source |
|---|---|---|---|---|---|---|
| Audio & Voice | Free | — | |||
| Audio & Voice | Paid | — | |||
 | Audio & Voice | Paid | — | |||
 | Audio & Voice | Paid | — | |||
 | Audio & Voice | Paid | $15/month | |||
 | Audio & Voice | — | — | |||
 | Audio & Voice | Freemium | $500/month | |||
 | Audio & Voice | Paid | — | |||
 | Audio & Voice | Paid | $10/month | |||
 | Audio & Voice | — | — | |||
 | Audio & Voice | — | — | |||
 | Audio & Voice | Paid | — | |||
 | Audio & Voice | Freemium | $6/month |
Top speech-to-speech alternatives
Deepgram
Audio & Voice
Power enterprise voice solutions with Speech-to-Text, Text-to-Speech, and Voice Agent APIs.
- Speech-to-Text
- Text-to-Speech
- Voice Agents
Paid
iSpeech
Audio & Voice
Converts text to natural-sounding voice and provides speech recognition.
- Text to Speech
- Speech Recognition
- Voice Cloning
Paid
Bland AI
Audio & Voice
Build, deploy, and monitor AI voice agents that sound human.
- Voice Agents
- AI Call Center
- Enterprise Compliance
Paid
Carbon Voice
Audio & Voice
Async voice messaging with AI-powered transcription and agents.
- Async Messaging
- AI Agents
- Voice Transcription
Cekura
Audio & Voice
End-to-end voice testing and observability platform for AI agents.
- Voice AI Evaluation
- Voice AI Observability
- AI Voice QA
Freemium
Dograh
Audio & Voice
Open-source voice agent platform for self-hosting and custom models.
- Voice Agent Builder
- Self-Hosted AI
- Regulated Compliance
Paid
Loqua
Audio & Voice
Context-aware voice typing for Mac and Windows
- Voice Typing
- Speech to Text
- Text to Speech
Paid
Phantom
Audio & Voice
Voice-first AI assistant for macOS that uses on-demand context to help carry out work across your Mac.
NovaVoice
Audio & Voice
Voice-powered productivity copilot for faster dictation and app control
- Voice Assistant
- Dictation Software
- Productivity App
AssemblyAI
Audio & Voice
Transcribes speech to text and extracts insights from voice data.
- Speech to Text
- Audio Intelligence
- Transcription
Paid
ElevenLabs
Audio & Voice
Generate lifelike speech with AI voices and voice agents.
- AI Voice Cloning
- Text-to-Voice
- Audio
Freemium