| Price from | $10/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | — | Yes |
| Linux | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 2 |
| Spec score · Chat APIs | 8.4 (#4) | 7.9 (#15) |
| Messaging | Publishers send messages to channels, and subscribers receive copies in real time. | The open-source messaging core includes rich media, mentions, replies, forwarding, reactions, message revocation, groups, privacy controls, and read state. |
| Security | The maker says Emitter supports per-channel authorization policies and SSL/TLS, encrypts network traffic, and does not inspect messages. | Server security includes TLS 1.3, QUIC and wss transport, RS256 signing with JWKS, token revocation, bcrypt password hashing, rate limits, privacy policies, and IP protection. |
| Support | The maker offers support contracts and directs questions to [email protected] and GitHub issues. | Community support is provided through GitHub issues and discussions, while commercial engagements add SLAs, dedicated channels, training, and engineering support. |
