Synthflow alternatives

At a glance

We list 11 other voice tools as alternatives to Synthflow: Aqua Voice, AssemblyAI, Cartesia, Deepgram, ElevenLabs, Murf AI, Retell AI, Speechmatics, Superwhisper, Vapi and Wispr Flow.
Aqua Voice, AssemblyAI, Cartesia, ElevenLabs, Speechmatics, Superwhisper and Wispr Flow have a free plan.
AssemblyAI and Retell AI work with Zapier, as Synthflow does.
Retell AI works with HubSpot, as Synthflow does.

From each tool's own website and from published reviews. Each tool's page says when its facts were checked.

11 alternatives

Listed alphabetically. A tool is ranked by its reviews once it has 3.

Aqua Voice
Fast, accurate, and private speech-to-text for Mac, Windows, iPhone, Android, and AI workflows.
No reviews yet
Choose it over Synthflow for: integration with Claude Code; ISO 27001 or SSO.
Free plan
Yes
Paid plans from
Pro, $10 per month billed annually (as of October 28, 2026)
Platforms
macOS, Windows, iOS, Android
Integrations shared with Synthflow
None in common
Main features
49 languages, Secure transcript history, Realtime mode
Security and compliance
SOC 2, ISO 27001, GDPR, HIPAA, SSO
Compare with Synthflow
Be the first to review
AssemblyAI
Voice AI infrastructure for builders, with pre-recorded and real-time speech-to-text and voice agent APIs
No reviews yet
Choose it over Synthflow for: integration with Twilio, Zoom or LiveKit; SSO.
Free plan
Yes
Paid plans from
Pay as you go, $0.21 per hour of audio for Universal-3 (as of October 20, 2026)
Platforms
API
Integrations shared with Synthflow
Zapier
Main features
Pre-recorded Speech-to-Text API, Realtime Speech-to-Text API, Speech Understanding API
Security and compliance
SOC 2, SSO
Compare with Synthflow
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Cartesia
Voice agents that answer and make calls, and the speech models behind them, in one API
No reviews yet
Choose it over Synthflow for: integration with Twilio, LiveKit or Pipecat; SSO.
Free plan
Yes
Paid plans from
Pro, $5 per month (as of October 20, 2026)
Platforms
API
Integrations shared with Synthflow
None in common
Main features
Sonic text to speech, Ink speech to text, Managed Agents
Security and compliance
SOC 2, SSO
Compare with Synthflow
Be the first to review
Deepgram
Speech-to-text, text-to-speech and voice agent APIs for real-time, enterprise voice AI
No reviews yet
Choose it over Synthflow for: integration with Twilio, LiveKit or Pipecat.
Plans
Pay as you go: $0.0043, Growth: $4K+ (as of October 19, 2026)
Platforms
API
Integrations shared with Synthflow
None in common
Main features
Voice agent API, Speaker diarization, Cloud or self-hosted deployment
Security and compliance
SOC 2, GDPR, HIPAA
Compare with Synthflow
Be the first to review
ElevenLabs
Create lifelike speech with an AI voice generator and voice agents platform, in 90+ languages
No reviews yet
Choose it over Synthflow for: integration with Twilio, Slack or Stripe; SSO.
Free plan
Yes
Paid plans from
Pro, $99 per month (as of October 19, 2026)
Platforms
API
Integrations shared with Synthflow
None in common
Main features
Text to speech, Speech to text, Voice cloning
Security and compliance
HIPAA, SSO
Compare with Synthflow
Be the first to review
Murf AI
Build AI voice experiences that are natural, scalable and efficient
No reviews yet
Choose it over Synthflow for: integration with PowerPoint, Canva or Google Slides; ISO 27001.
Paid plans from
Pay as you go, $0.01 per 1000 characters for Falcon 2 (as of October 23, 2026)
Free trial
Yes
Platforms
API
Integrations shared with Synthflow
None in common
Main features
Text to speech, AI Dubbing, Voice Cloning
Security and compliance
SOC 2, ISO 27001, GDPR, HIPAA
Compare with Synthflow
Be the first to review
Retell AI
Build, deploy, and manage AI voice agents that sound human, execute tasks, and scale
No reviews yet
Choose it over Synthflow for: integration with Twilio, Zendesk or Google Workspace; ISO 27001 or SSO.
Paid plans from
Pay as you go, $0.07 per minute for AI voice agents, from $0 (as of October 20, 2026)
Platforms
Web, API
Integrations shared with Synthflow
HubSpot, Salesforce, Zapier
Main features
Call transfer, Book appointments, Knowledge base
Security and compliance
SOC 2, ISO 27001, GDPR, HIPAA, SSO
Compare with Synthflow
Be the first to review
Speechmatics
Speech APIs powering Voice AI
No reviews yet
No checked fact sets it apart from Synthflow yet.
Free plan
Yes
Paid plans from
Melia 1, $0.12 per hour of pre-recorded audio (as of October 23, 2026)
Platforms
API
Main features
Real-time, Speaker diarization, Custom dictionary
Compare with Synthflow
Be the first to review
Superwhisper
AI voice to text for macOS, Windows, iOS and Android. Dictate in any app, offline or in the cloud
No reviews yet
Choose it over Synthflow for: integration with Slack, Notion or Cursor.
Free plan
Yes
Plans
Free: $0, Enterprise: Custom (as of October 19, 2026)
Platforms
macOS, Windows, iOS, Android
Integrations shared with Synthflow
None in common
Main features
Dictation in any app, Offline transcription, Custom modes
Security and compliance
SOC 2, HIPAA
Compare with Synthflow
Be the first to review
Vapi
Build, test and deploy voice AI agents. The platform for developers creating conversational voice AI
No reviews yet
Choose it over Synthflow for: integration with Deepgram, OpenAI or ElevenLabs; SSO.
Paid plans from
Core, $29 per month, plus usage (as of October 19, 2026)
Platforms
API
Integrations shared with Synthflow
None in common
Main features
Testing and simulation, Call monitoring, Telephony and SIP
Security and compliance
SOC 2, HIPAA, SSO
Compare with Synthflow
Be the first to review
Wispr Flow
Voice-to-text AI that turns speech into clear, polished writing in every app
No reviews yet
Choose it over Synthflow for: integration with Zoom, Google Meet or Microsoft Teams; ISO 27001 or SSO.
Free plan
Yes
Plans
Free: $0, Enterprise: Custom (as of October 19, 2026)
Platforms
macOS, Windows, iOS, Android
Integrations shared with Synthflow
None in common
Main features
Personal dictionary, Snippets, AI meeting notetaker
Security and compliance
SOC 2, ISO 27001, HIPAA, SSO
Compare with Synthflow
Be the first to review

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At a glance

We list 11 other voice tools as alternatives to Synthflow: Aqua Voice, AssemblyAI, Cartesia, Deepgram, ElevenLabs, Murf AI, Retell AI, Speechmatics, Superwhisper, Vapi and Wispr Flow.

Aqua Voice, AssemblyAI, Cartesia, ElevenLabs, Speechmatics, Superwhisper and Wispr Flow have a free plan.

AssemblyAI and Retell AI work with Zapier, as Synthflow does.

Retell AI works with HubSpot, as Synthflow does.

From each tool's own website and from published reviews. Each tool's page says when its facts were checked.