| Price from | $1.35/mo | €8.90/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | — |
| Self-hosted | Yes | Yes |
| Plans published | 3 | 7 |
| Spec score · Mail Server Software | 8.3 (#5) | 8.4 (#3) |
| Headquarters | Prague, Czech Republic | Willich, Germany |
| Integrations | 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. | The documentation lists client setup guides for Android, Apple macOS/iOS, eM Client, KDE Kontact, Outlook, and Thunderbird. |
| Product | IceWarp is an all-in-one collaboration platform combining email, messaging, video conferencing, file sharing, and real-time document collaboration in one interface. | mailcow: dockerized is an open-source groupware and email suite based on Docker. |
| Security | 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. | Two-factor authentication options include YubiKey OTP, WebAuthn, and TOTP. |
| Support | The pricing page lists 24/7 support for cloud customers and offers Cloud Plus support with a 24/7 hotline and stated response targets. | Commercial support is available through Servercow, while community support is voluntary, best-effort, and not guaranteed. |
