PolyAI vs Synthflow (2026): which should you pick?

Pick PolyAI if

• Fits if you want a phone agent for a single small business line
• Works for developers who want to pay by the minute through the model API

Look elsewhere if

• Tight if you take many calls: Essentials covers 250 minutes
• Pricey if you have several sites, as Scale is per location
• Watch out: the trial length is not stated
• Watch out: the developer tab bills by connected time, 2c a minute for the model API and from 9.5c for the full platform

Pick Synthflow if

• Fits if you want white-label voice agents under one annual contract
• Makes sense if you use Five9, Salesforce or HubSpot

Look elsewhere if

• Not for you if you want to try it, as the page says no free plan and no trial
• Skip it if you are a small business, since every deployment starts on an Enterprise contract
• Not for you if you want per-minute pricing, because the page says there is none
• Watch out: HIPAA is self-attested in the vendor's own Trust Center summary

PolyAI

• The Scale price is per location, so ten locations is not a single price.
• A separate Developer tab bills by connected time: the Model API at 2c a minute and the full platform from 9.5c a minute.
• The pricing page lists $20 of free credit for developer pay-as-you-go accounts.

Synthflow

• No prices are published. The pricing page says it is an annual enterprise agreement with no free plan, no trial and no per-minute rate.
• Every new deployment starts on an Enterprise contract, so it is not set up for self-serve small-business use.
• HIPAA is listed as self-attested in the vendor's own Trust Center summary.

PolyAI

Dialog Agent

Builds agents with flows, tools and brand voice, from no-code to full code on one platform.

Wren

An assistant that designs, builds, tests and optimizes agents from a plain-English description.

Dialog-RSN-1 model

The vendor's audio-native model, which it says responds in under 300ms median first-token latency.

Call insight

Every call gets a summary and a PolyScore, with latency and agent details visible in real time.

Bring your own phone line

Keep an existing number and connect a carrier over SIP at no charge, or take a number from PolyAI.

Synthflow

Voice agents for calls

Agents handle customer service, reception, answering service, concierge, appointment booking and IVR use cases over the phone.

Telephony options

The contract can use Synthflow Native Telephony, SIP trunking or approved enterprise telephony, with routing, escalation and fallback logic.

White label

BPOs and software platforms can run it under their own brand, with a workspace per client and one analytics dashboard across them.

Launch support

Where the agreement includes it, Synthflow's forward-deployed engineers implement, test and launch agents with your team. Deployments go live in weeks.

Security and compliance

The Trust Center lists SOC 2 Type 2, ISO 27001, GDPR, HIPAA (self-attested) and PCI DSS v4.0.1, with ISO 42001, DORA and the EU AI Act in progress.

PolyAI

• Essentials$49

  per month, 250 minutes included

  Then 30c a minute. 1 number, 5 calls at once; Google Calendar, Calendly, Cal.com and Zapier.

• Plus$199

  per month, 1,000 minutes included

  Then 25c a minute. 10 calls at once; adds HubSpot, Zoho CRM, Dynamics 365 and Microsoft 365.

• Scale$299

  per location per month, 1,500 minutes each

  Then 20c a minute. Up to 9 locations with pooled minutes; adds Salesforce, Zendesk and Slack.

• EnterpriseCustom

  Sold through sales: HIPAA with a BAA, SSO, uptime SLA, data residency and 24/7 support.

Synthflow

Pricing could not be confirmed. See synthflow.ai.