Silux Voice vs Synthflow
No-code AI voice agent builder.
Honest comparison written by the team that built Silux Voice. Updated for 2026.
Silux Voice
$0 → $0.05/min
Free trial + Pay-as-you-go. From $24.99/mo Starter.
- ✅ Cross-call caller memory with confidence scoring and a one-switch off control
- ✅ Self-serve from $0 with $0.05/min PAYG — Synthflow now sells enterprise contracts only, from $30,000/yr
- ✅ Books live into your preferred calendar mid-call
- ✅ Real PCI payment-by-phone (secure DTMF capture)
- ✅ In-call translation (Synthflow has no native translation)
Synthflow
$30,000/yr enterprise floor
+ usage/min usage
- ➖ No-code agent builder UX (we ship a ticket-driven configurator)
- ➖ FSM partial integrations
Where Silux Voice wins
- ✓Cross-call caller memory with confidence scoring and a one-switch off control
- ✓Self-serve from $0 with $0.05/min PAYG — Synthflow now sells enterprise contracts only, from $30,000/yr
- ✓Books live into your preferred calendar mid-call
- ✓Real PCI payment-by-phone (secure DTMF capture)
- ✓In-call translation (Synthflow has no native translation)
- ✓Multi-engine TTS fallback (we have 6, they have 1)
- ✓14-day free trial with phone connectivity
Where Synthflow matches us
Honest benchmarking — these are the dimensions where Synthflow is at parity or close.
- ≈No-code agent builder UX (we ship a ticket-driven configurator)
- ≈FSM partial integrations
More comparisons + verticals
Silux Voice vs Vapi.ai
Developer-first voice AI infrastructure (US-centric, cloud-only).
Silux Voice vs Bland.ai
AI phone calls API (US, cloud-only, outbound-heavy).
Silux Voice vs Retell AI
Real-time voice agents with strong barge-in.
Receptionist for HVAC contractors
When the AC dies in July, the customer calls four contractors and books with the first one who picks up. If your office is on a job site, that's not you.
Receptionist for plumbers
A burst pipe at 6pm is an emergency for the customer and a booked job for you — but only if someone answers. Under a sink, you can't, and the caller dials the next plumber on Google.
Receptionist for electricians
Fault-finding, a dead consumer unit, a tripping circuit — the customer wants it fixed today. If you're mid-install and can't pick up, that booked job goes to the next sparky.
Try Silux Voice for free
30 minutes / month. No credit card required.