Synthflow alternatives

Tools that do what Synthflow does, found by what they say they do rather than by shelf. Among the equally alike, the most used come first. Each line says how it differs from Synthflow.

Read 2026-10-16 · Synthflow itself: Contact sales

With a free plan or free to use: Retell AI, Bland, Vapi, Phonely, byVoice, ElevenLabs.

10 alternativesUnlike Synthflow

#1
Retell AI Voice
Builds and deploys AI voice agents for phone calls, handling inbound and outbound campaigns with transfers, IVR navigation, and CRM integration.
Free planAlso: Workflow automation
91.2k
Active
From $0.07 per use
2023
#2
Goodcall Voice
Deploys AI phone agents to answer and automate customer service and sales calls.
More widely usedAround longer, since 2017
1.1M
Active
From $79/user/mo
2017
#3
Bland Voice
Automates phone calls for enterprises using voice AI agents that run on your infrastructure.
Free planCan run on your servers
11.6k
Active
From $0.14 per use
#4
Vapi Voice
Builds and deploys voice AI agents that handle customer support, lead qualification, and appointment scheduling calls.
Free plan
32.1k
Active
From $0.01 per use
#5
Phonely Voice
Builds voice agents that answer and handle business calls across phone, chat, SMS, and API.
Free plan
594
Active
From $50/mo
2023
#6
PolyAI Agents
Builds and runs voice AI agents that handle customer conversations across phone, chat, and other channels.
Around longer, since 2017
392k
Active
Pay per use
2017
#7
talku.ai Voice
Routes incoming calls through AI voice agents via SIP integration without replacing existing PBX systems.
Same job
1
From $50/mo
#8
byVoice Voice
AI voice agents answer calls, handle appointments, and conduct outbound campaigns 24/7.
Free plan
102
Active
From $29/mo
#9
ElevenLabs Voice MCP · sign-in
Generates synthetic speech, creates videos and music, and deploys conversational voice agents across 70 languages.
Free planMore widely used
1.4M
Active
From $6/mo
2022
#10
Lexycall Voice
Handles incoming calls with voice AI to schedule appointments, answer questions, and capture orders without human staff.
Also: Workflow automation
25
Active
Contact sales

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How this list is made: the words Synthflow is described with (what it does, for whom, what it is used for) are matched against every tool in the Atlas. A tool on the same shelf, or doing the same kind of work, counts for a little more. Nothing here is paid for.