Synthflow vs Vapi
Synthflow
synthflow.aiVapi
vapi.aiSide by side
| Figure | Synthflow | Vapi |
|---|---|---|
| Price from | $2,500/mo | $29/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 1 | 5 |
| Spec score · AI Voice Agents | 7.2 (#24) | 8.6 (#5) |
| Spec score · Conversational AI Platforms | 7.1 (#33) | 8.5 (#10) |
| Spec score · Voice Ai Tools | 7.1 (#26) | 8.6 (#9) |
| Integrations | Synthflow says it connects with more than 200 apps, including HubSpot, Salesforce, RingCentral, Zapier, and Google Calendar. | Documented prebuilt or standard integrations include Make, n8n, Google Calendar, Google Sheets, Slack and GoHighLevel. |
| Product | Synthflow describes itself as an enterprise Voice AI platform for automating inbound and outbound phone conversations. | Vapi describes itself as a platform for builders to build, deploy, and improve voice agents. |
| Security certifications | Its Trust Center lists SOC 2 Type 2, GDPR, HIPAA, ISO/IEC 27001, ISO/IEC 42001:2023, and PCI DSS v4.0.1 among its compliance resources. | Vapi states that it is SOC 2 Type II attested and undergoes annual third-party audits. |
| Support | Enterprise pricing includes SLA and support terms scoped in the contract, along with implementation, onboarding, testing, training, and launch support. | The free-start package includes peer-to-peer support through Discord and email support without an SLA; paid packages list response SLAs and additional support options. |
| Telephony | Synthflow says its in-house telephony supports SIP trunking and integration with existing telephony systems. | Telephony capabilities include custom SIP, warm transfers, voicemail detection, phone number management, and DTMF support. |
Plans
Vapi
- No Success PackageFree
- Core$29 a month
- Pro$999 a month
- PremierPriced on request
- No Success Package / Usage onlyFree
In their own words
Vapi
Vapi is a voice-call platform available on the web and iOS. It supports inbound and outbound calls, human handoff, concurrent calls, and custom phone numbers. The usage-based No Success Package is listed at free and includes $5 in starter credits, one Vapi phone number, four concurrent calls, and full platform access. Core costs $29 a month, billed monthly, and includes five phone numbers, 10 concurrent calls, 30 days of raw data retention, and email support. Pro costs $999 a month, billed monthly, and includes 10 phone numbers, 30 concurrent calls, 180 days of raw data retention, RBAC, ZDR, and a 99% uptime SLA. Premier uses custom pricing; its listed options include custom phone-number counts and custom RBAC, ZDR, and SSO, with dedicated SIP available. The service listing says there is no free plan, although the No Success Package is presented at no cost with starter credits. Plan allowances vary, so the listed overall concurrent-call figure of 10 is not the allowance for every package.