Kannel
6.6#27 in sms api servicesFree planFree planAPILinuxSelf-hosted
VisitKannel vs Telnyx SMS API
Telnyx SMS API
8.2#2 in sms api servicesFrom $500 a monthFree planWebAPI
VisitWhat both publish
| Fact | Kannel | Telnyx SMS API |
|---|---|---|
| Founded | 1999 | 2009 |
| Free plan | Yes | No |
| Inbound webhooks | Yes | Yes |
| Support | The project directs users to its mailing lists for contact information and the developer mailing list for development discussion and patches. | Telnyx advertises free 24/7 expert support for the SMS API. |
| Two-way SMS | Yes | Yes |
Kannel plans
- KannelFree
Telnyx SMS API plans
- SMS API usageFree
- SMS API pay as you goFree
- Pay as you goFree
- Committed$500 a month
- Enterprise$5,000 a month
Pick Kannel if…
It suits operators building self-hosted SMS or WAP gateway infrastructure on Linux and related Unix-like systems. Developers needing HTTP-based messaging integration can use its documented interfaces and protocols.
Pick Telnyx SMS API if…
This API suits developers building SMS or MMS messaging into applications, including workflows that need inbound webhooks, delivery reporting, or multiple sender types. Account limits and per-message charges are worth reviewing before use.