| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 9 |
| Spec score · SMS Gateway Software | 8.1 (#19) | 8.5 (#10) |
| Spec score · SMS APIs | 8.1 (#18) | 8.5 (#10) |
| Spec score · SMS API services | 7.9 (#22) | 8.6 (#8) |
| Founded | 1999 | 2013 |
| Free plan | Yes | No |
| Inbound webhooks | Yes | Yes |
| Product | Kannel is an open-source WAP and SMS gateway for mobile internet connectivity, WAP Push, and SMS messaging. | Messente provides a business messaging platform for sending SMS, Viber, and WhatsApp messages globally. |
| Security | The user guide documents SSL support for HTTP client and server communication, and SSL-enabled SMPP connections. | Messente lists GDPR, DORA, and ISO 27001:2022 compliance, with data hosted in Germany and Finland. |
| Support | The project directs users to its mailing lists for contact information and the developer mailing list for development discussion and patches. | The pricing page describes basic support and onboarding for Pay-As-You-Go and dedicated support with an Account Manager for the Commitment plan. |
| Two-way SMS | Yes | Yes |
