| Price from | $2,500/mo | Free |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 1 | 5 |
| Spec score · AI Voice Agents | 7.2 (#24) | 8.2 (#10) |
| Spec score · Conversational AI Platforms | 7.1 (#33) | 8.2 (#16) |
| Spec score · Voicebot Software | 7.0 (#25) | 8.2 (#5) |
| Headquarters | Berlin, Germany | San Mateo, California, United States |
| Integrations | Synthflow says it connects with more than 200 apps, including HubSpot, Salesforce, RingCentral, Zapier, and Google Calendar. | Yellow.ai advertises more than 150 prebuilt enterprise integrations, including Salesforce, Zendesk, Genesys and NICE. |
| 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. | Yellow.ai states that it has ISO/IEC 27001:2022, ISO/IEC 27701:2019 and SOC 2 Type II certifications or attestations, plus PCI DSS 4.0.1 service-provider compliance and HIPAA support. |
| Security controls | Synthflow documents two-factor authentication, enterprise single sign-on, allowed email domains, and signed webhooks. | Security pages describe SSO, role-based permissions, TLS encryption, virtual private cloud controls, ACLs, vulnerability scanning and annual penetration tests. |
