| Price from | $239/mo | $10/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| Linux | — | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 4 | 2 |
| Spec score · Chat APIs | 8.5 (#3) | 8.4 (#4) |
| Messaging | Its messaging features include one-to-one and group chat, file sharing, voice notes, message history, threaded replies, and read receipts. | Publishers send messages to channels, and subscribers receive copies in real time. |
| Product | CometChat provides in-app chat, voice and video calling, and conversational AI agent capabilities for applications. | Emitter is a real-time publish-subscribe messaging service for connecting online devices. |
| Security | The maker states that CometChat is HIPAA compliant and can enter into a BAA, and is certified for ISO 27001 and SOC 2 Type 2. | The maker says Emitter supports per-channel authorization policies and SSL/TLS, encrypts network traffic, and does not inspect messages. |
| Support | CometChat describes multiple support tiers with options for faster response times, architectural reviews, and production guidance. | The maker offers support contracts and directs questions to [email protected] and GitHub issues. |
