Sigma Dialer vs Twilio Flex
| Sigma Dialer | Twilio Flex | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | Yes |
| Paid from | — | $1/mo |
| Open source | No | No |
| Platforms | Web | api, self-hosted, Web |
| Inbound calling | Yes | Yes |
| Outbound dialer | Yes | Yes |
| IVR builder | Yes | Yes |
| Digital channel scope | voice_only | omnichannel |
| Free plan | — | No |
| Workforce management | — | No |
Both are listed in Best Call Center Software. On Inferse, Twilio Flex scores higher on our published basis.