Alert21 vs Vonage SMS API
| Alert21 | Vonage SMS API | |
|---|---|---|
| Free trial | Yes | |
| Platforms | Web | Android, api, iOS, Web |
| Pay-as-you-go | Yes | Yes |
| SMS API | Yes | Yes |
| Delivery status | Yes | Yes |
| Webhooks | Yes | Yes |
| Free plan | No | |
| Two-way messaging | Yes | |
| Inbound calling | Yes | |
| Outbound dialer | Yes | |
| IVR builder | Yes | |
| Digital channel scope | omnichannel | |
| Workforce management | Yes | |
| Validation modes | api | |
| Line type data | Yes | |
| Carrier data | Yes | |
| Reachability data | Yes | |
| Two-way SMS | Yes | |
| Inbound webhooks | Yes | |
| Short code support | Yes | |
| Toll-free numbers | Yes | |
| SDK languages | Node.js, Python, Java, Kotlin, Ruby, PHP, .NET | |
| MMS support | No | |
| Real-time video | Yes | |
| Recorded video | Yes | |
| Mobile SDKs | Yes | |
| Maximum participants | 15,000 participants | |
| Recording storage | both | |
| Client platforms | all | |
| Outbound calling | Yes | |
| Phone number support | Yes | |
| SIP support | Yes | |
| Call recording | Yes |
Listed together in Best Transactional SMS Software