V
VSynthflow vs Voice.ai
Pricing, features, platforms and who each one suits — side by side.
S
Choose Synthflow if…
- you're in its core audience: contact centers, bpos
V
Choose Voice.ai if…
- you want a free plan to start with
- you work on macOS
- you're in its core audience: customer support teams, content creators
Side by side
Feature Synthflow Voice.ai
Pricing modelContact for pricingFreemium
Starting price—$5/mo
Free plan
Free trial
API
Open source
PlatformsWeb, APIWeb, API, macOS
CategoryVoice AgentsText to Speech
CompanySynthflow AIVoice AI Inc.
Full feature lists
S Synthflow
- Inbound and outbound AI phone agents
- Response time under half a second, with interruption handling
- Language switching during a call
- Warm handoff to human agents with full transcript
- Appointment booking, voicemail detection and SMS follow-ups
- 200+ integrations including Salesforce, HubSpot, Zendesk
- Pre-launch testing and staged rollout with approval
- US, EU and Latin America hosting regions
V Voice.ai
- AI voice agents for inbound and outbound calls
- Text to speech in 15+ languages and accents
- Voice cloning from about 10 seconds of audio
- Real-time voice changer with noise remover
- Vocal remover, stem splitter and audio enhancer tools
- CRM and helpdesk integrations: Salesforce, HubSpot, Zendesk, Slack
- Python and TypeScript SDKs
- Cloud or on-premise deployment
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
Synthflow · synthflow.ai
Voice.ai · voice.aiWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
Synthflow
EnterpriseCustom
Voice.ai
Free$0
Starter$5/mo
Launch$24/mo ($12 first month)
Core$99/mo
Scale$330/mo
Business$880/mo
EnterpriseCustom
Price changes we've recorded
We re-read each pricing page every month and log what changed.
Synthflow
No changes since we started tracking.
Voice.ai
- Nov 8, 2026Launch: $12 → $24
Strengths and limitations
Synthflow
- SOC 2 Type II, ISO 27001, PCI DSS and HIPAA BAA compliance
- Works with major phone systems and SIP trunks
- White-label deployment with per-client workspaces
- Retention controls can delete recordings and transcripts after 30 days
- No free plan or trial
- Sold only as an annual enterprise agreement
- No published prices or per-minute rate
- SMS and WhatsApp limited to US workspaces
Voice.ai
- Free plan with 5k credits a month
- Paid plans start at $5/month
- APIs and SDKs for agents, TTS and voice changing
- Lists GDPR, SOC 2 and HIPAA compliance
- Free plan has no instant voice clones and a 500-character limit per conversion
- HIPAA BAAs and SSO are limited to the Enterprise plan
More comparisons
Other options to consider
VV
Free, from $29/mo
V
Developer platform to build, test and deploy voice AI agents for phone calls
Voice AgentsFree planAPI
B
BB
Free, from $299/mo
R
R
Free trial
R
Build, deploy and monitor AI voice agents that answer and place phone calls
Voice AgentsAPI
P
PP
Contact
P
Voice and chat AI agents for enterprise customer service, plus a voice model API
Voice AgentsAPI
Z
ZZ
Free trial
I
IAI customer agent that resolves support, sales and ecommerce conversations
From $49.50/mo
I
From $49.50/mo
I
AI customer agent that resolves support, sales and ecommerce conversations
Customer SupportAPI
Facts from each vendor's public pages, prices checked Nov 8, 2026. Editorial policy