OSDial vs Sigma Dialer
OSDial
osdial.comSigma Dialer
sigmadialer.comSide by side
| Figure | OSDial | Sigma Dialer |
|---|---|---|
| Price from | — | — |
| Free plan | — | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 1 |
| Spec score · Telemarketing | 7.5 (#8) | 7.1 (#13) |
| Spec score · Call Center Software | 7.4 (#96) | 7.1 (#107) |
| API | The maker says OSDial includes an API for loading leads from an external webpage and lists a basic admin and agent API. | Sigma lists an open REST API and real-time webhooks for connecting other systems. |
| Deployment | The downloadable OSDial 3.0.2 images are 32-bit and 64-bit Linux-based installs, and installation erases the target drive to install a CentOS-based operating system. | The site describes the product as a cloud platform and says most teams place their first live call on day one. |
| Integrations | OSDial supports external databases and remote website lead insertion, and its corporate page recommends Binfone and WSS Communications as carriers. | The site lists Salesforce, HubSpot, Zendesk, Pipedrive, Slack, Intercom, Snowflake, BigQuery, Segment, Redshift, Twilio, Amazon S3, Databricks, Claude, OpenAI, and webhooks. |
| Product | OSDial is an open-source predictive dialer for inbound, outbound, and blended calling. | Sigma Dialer combines a predictive dialer, inbound ACD, compliance layer, and agent desktop in a cloud platform. |
| Support | The Annual Support Agreement includes upgrades, five support hours and one training hour per month, after-hours support availability, and priority over hourly customers. | The site says a named launch engineer supports onboarding and sales responds in under four hours on business days. |
Plans
In their own words
OSDial
OSDial is a free, AGPL-licensed call-center dialer for inbound, outbound, and blended calling, including IVR. It supports predictive, power, manual, adaptive, and broadcast dialing, with custom dialplans, carrier failover, call recording, answering-machine detection, skill routing, and local presence. Campaign tools handle lead import and export, custom fields, advanced search, list mixing, external databases, and custom disposition codes. Real-time and summary reports cover calls, leads, agents, lists, and server performance. Agents can log in remotely with a phone and web browser. APIs support lead loading from an external webpage and basic administration and agent functions. OSDial can scale from a few agents to several hundred, with a sizing guide for deployments up to 480 seats. Version 4.0 is under development as a hosted solution; downloadable legacy version 3.0 remains available. Its installer erases the target drive and installs a CentOS-based operating system. There are no license fees or required support hours, but OSDial Cluster, SQL Cluster, Multi-tenant, Archive, and E-mail Template modules are non-free. Platforms include API, Linux, self-hosted, and web.
Sigma Dialer
Sigma Dialer has no write-up on Specifiction yet; its figures are above.