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The Stack / Voice & Audio
Synthflow
04 AutomationStill the phone-agent seat, but 2026 changed the buy: Synthflow retired its self-serve tiers, and published pricing now starts at $30,000-a-year enterprise contracts with an unpublished pay-as-you-go path. An agent that answers and books at 2am still pays for itself at real call volume — just expect a sales conversation, not a $29 test. Demo before you commit, and watch this seat.
The job in the stack
The phone seat: AI voice agents handling inbound calls, qualification, and booking without a human on the line.
Pricing
| Plan | Price | Notes |
|---|---|---|
| Pay-As-You-Go | usage-based | Free to build agents, pay per call — but Synthflow no longer publishes per-minute rates; the docs pricing page now redirects to enterprise sales |
| Enterprise | from $30,000/yr | Custom-scoped by call volume, concurrency, telephony, integrations, and launch support; HIPAA, SOC 2, PCI DSS, GDPR, ISO 27001 |
Pricing verified 2026-10-09. Plans change — the source of truth is Synthflow's own pricing page.
Models & versions
- Voice agents Multi-agent voice flows, AI Sandbox with versioning, 200+ integrations; enterprise BELL deployment framework
The honest read
What works
- + Answers every call, every hour — the leak most small businesses never measure
- + No-code flow builder plus calendar and CRM integrations
- + Human-transfer paths keep the trust boundary manageable
What breaks
- − Published pricing is enterprise-only — contracts start at $30,000/yr
- − Pay-as-you-go rates are no longer published; you learn the price in a sales conversation
- − Complex or emotional calls still need a human — script the handoff
- − AI-caller regulations vary by region; compliance is on you
Use it for
- →Service businesses missing after-hours calls
- →Lead qualification before a human closes
- →Appointment booking at volume
Skip it if
- ×Call volume is low enough for a human — warmth still converts better
- ×Your market or clients react badly to AI callers — know your audience
- ×You need published, predictable pricing — Synthflow no longer offers it
Questions operators ask
?Will callers know it's an AI?
Good ones sound close to human, but assume yes — and in several jurisdictions you must disclose it. Design the script so disclosure doesn't kill the call: competence builds more trust than pretending.
What changed
- Freshness sweep — re-verified on synthflow.ai/pricing: still a single Enterprise plan from $30,000/yr, scoped by call volume, concurrency, telephony, integrations, security and launch support; both CTAs go to sales and no per-minute rates are published. No Synthflow announcements found since Sept 21. A Sept 21 third-party guide describes bring-your-own voice engine/LLM/telephony pay-as-you-go at about $0.09/min, which is not on the official page and is not adopted. No changes.
- Freshness sweep — re-verified on synthflow.ai/pricing: the page still lists a single Enterprise plan from $30,000/yr, scoped by call volume, concurrency, telephony, and integrations, with no per-minute rates published. Third-party reviews quote a pay-as-you-go rate of roughly $0.08-$0.24/min plus $20 per extra concurrency slot; none of that is on the official page, so it is not adopted here. Verdict and pricing rows unchanged.
- Freshness sweep — re-verified on synthflow.ai/pricing: the page still shows only Enterprise, with both CTAs routing to Contact Sales / Get a Demo. No published per-minute pay-as-you-go rates on the official page, matching last month's finding. Third-party guides continue to quote PAYG figures around $0.08-0.25/min plus a $1.50/mo phone number line and a $2,000/mo white-label reseller add-on, but none of that is confirmed on Synthflow's own site — not added to the record until it is. No change to pricing table or verdict.
- REAL DRIFT — self-serve pricing retired: synthflow.ai/pricing now shows only enterprise contracts starting at $30,000/yr; the Starter $29 / Pro $99 / Growth $449 / Agency $899 tiers we verified July 11 are gone, and the docs pay-as-you-go page redirects to enterprise pricing. Pay-as-you-go still exists (free to build, pay per call) but the vendor no longer publishes per-minute rates. Pricing table, verdict, cons, and skip-ifs rewritten for the enterprise pivot.
- Real drift found: the seeded ~$375+/mo Pro estimate was wrong. Confirmed 4-tier structure on synthflow.ai: Starter $29 (50 min), Pro $99 (200 min), Growth $449 (1,000 min), Agency $899 (2,000 min), plus $0.15-0.25/min overage.
- Added to the stack (phone seat). Pricing seeded from January 2026 baseline, pending fresh verification by the update loop.
Give Synthflow a job
The phone seat: AI voice agents handling inbound calls, qualification, and booking without a human on the line.
Try Synthflow →Affiliate link — same price for you, keeps the stack maintained.
Alternatives with different jobs
ElevenLabs
03 CreationThe voice seat: narration, voice cloning for scaled content, and audio versions of written work.
GoHighLevel
04 AutomationThe client-machine seat: CRM, pipelines, funnels, booking, SMS/email follow-up, and white-label delivery for agencies and local-service businesses.