| Price from | Free | $1.35/mo |
| Free plan | Yes | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | — |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 4 | 3 |
| Spec score · Mail Server Software | 8.4 (#2) | 8.3 (#5) |
| Founded | 2004 | 2001 |
| Headquarters | Bucharest, Romania | Prague, Czech Republic |
| Integrations | The features page lists OpenLDAP, Active Directory, OAuth 2.0, OpenID Connect, Zoom, and Microsoft Teams integrations or support. | The product page describes Outlook Sync for syncing email, calendar, tasks, and notes with Outlook; the cloud API provides access to calendars, files, notes, contacts, tasks, and emails. |
| Product | Axigen is an all-in-one email, calendaring, and collaboration platform for organizations from small businesses to large service providers. | IceWarp is an all-in-one collaboration platform combining email, messaging, video conferencing, file sharing, and real-time document collaboration in one interface. |
| Security | Listed protections include authentication and encryption, access and flow controls, SPF, DKIM, DMARC compliance, and two-step verification. | The pricing page lists antivirus and antispam with Core, while the site footer displays ISO 9001, ISO 27001, ISO 27017, ISO 27018, ISO 29119-1, SOC 2, and HIPAA compliance badges. |
| Support | The support page says business and channel support engineers are available around the clock, with an average response time under two hours for all issue types. | The pricing page lists 24/7 support for cloud customers and offers Cloud Plus support with a 24/7 hotline and stated response targets. |
