OPSI vs PatchMon
OPSI
opsi.org
PatchMon
patchmon.netSide by side
| Figure | OPSI | PatchMon |
|---|---|---|
| Price from | €0.42/mo | $1/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | Yes | Yes |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | — |
| Linux | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 5 | 6 |
| Spec score · Patch Management Software | 9.0 (#2) | 9.0 (#3) |
| Spec score · IT Automation Software | 9.0 (#7) | 8.9 (#8) |
| Company founding | uib says the Umwelt-Informatikbüro was founded in 1995 and later incorporated as UIB GmbH. | LinkedIn lists PatchMon as founded in 2025. |
| Documentation depth | The English 4.3 manual covers supported systems, quick start, server, clients, interfaces, products, modules, opsi-script, troubleshooting and contribution. | The documentation set includes a 168-page Admin Guide, 207-page Operator Guide and 128-page API and Integrations Guide. |
| Headquarters | Mainz, Germany | London, United Kingdom |
| Self-hosting | OPSI can be installed with Docker or a ready-to-use virtual machine, and its Docker helper scripts support Windows, Linux and macOS hosts. | Self-hosted deployment is offered through Docker Compose, native binaries and a Proxmox LXC script. |
| Support | uib offers phone and email support through support contracts, as well as training, workshops, and webinars. | Cloud support channels vary by tier: Starter includes email and Discord, Plus adds Slack, and Max also includes phone support. |
| What it does | OPSI is a client-management system for Windows, Linux and macOS devices, using a Linux server for deployment, inventory and patching. | PatchMon centralizes patch monitoring, patch deployment, compliance and remote access for Linux, FreeBSD and Windows fleets. |
Plans
OPSI
- BasicFree
- CommunityFree
- Professional€4.99 a year
- Enterprise€8.99 a year
- Enterprise Cloud€11.99 a year
PatchMon
- Community EditionFree
- Community EditionFree
- Starter$1 a month
- Plus$2 a month
- Max$3 a month
- PROPriced on request
In their own words
OPSI
OPSI is an open-source client management system for software distribution, operating-system installation, inventory, patch management, and configuration. It can deploy Windows updates, MSI packages, setup programs, and system packages without interactive installation steps. It also automates installations of Windows client and server systems and common Linux distributions, including unattended and image-based setups.
Regular inventory collects hardware and software details, including hardware information from devices without an operating system. Administration can be centralized across multiple sites, each with its own depot servers, configurations, and software packages. Directory integrations support Active Directory, Samba 4, and OpenLDAP; single sign-on extensions support Microsoft Entra ID and Keycloak through SAML 2.0. OPSI-WebGUI runs in a modern browser without client-side installation. Community is free with unlimited devices and one worker process. Basic is free for up to 30 devices and one setup per user. Professional costs €499 a year and requires a minimum purchase of 100 devices; Enterprise costs €899 a year with the same minimum. Enterprise Cloud costs €1,199 a year, starting at 100 devices.
PatchMon
PatchMon provides a central dashboard for patch monitoring across Linux, FreeBSD, and Windows server fleets. Policies can schedule patches immediately, after a delay, or at a fixed time, with dry-run validation, approval workflows, and assignment by host or host group. Automated patch deployment is available on Linux and FreeBSD; Windows deployment is on the roadmap. Patch runs record who triggered and approved them, timestamps, policy details, affected packages, and command output. OpenSCAP CIS benchmark scans include per-rule results, severity, remediation guidance, and score tracking. Listed integrations span Proxmox LXC, Ansible, Docker, REST API, OpenSCAP, SSH, Windows RDP, and messaging and AI services. Monitoring agents connect outbound over WebSocket, use TLS in transit, and do not require root for monitoring operations. The free Community Edition is self-hosted under AGPLv3, with users responsible for the server, updates, backups, and uptime. Cloud plans start at $1 a month per endpoint. Cloud trials last 14 days, include Plus features, require a card at signup, and are not charged if cancelled before they end.