| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 4 |
| Spec score · IT Incident Management Software | 8.6 (#12) | 8.7 (#11) |
| Deployment | The quick start requires Docker and Docker Compose and describes a seven-service Docker stack. | The offer page lists both SaaS and on-premise availability for subscriptions. |
| Integrations | Inbound alerts support Prometheus, Grafana, generic JSON and webhooks; organization notification channels include Slack, Teams and webhooks. | The extension marketplace lists integrations for vSphere, DHCP, DNS, OpenID Connect, Power BI, SAML, email-to-ticket and other systems. |
| License | Callu is free and open source under the MIT License. | The main iTop repository is licensed under GNU Affero General Public License version 3.0. |
| What it does | Callu is a single-tenant incident management and on-call platform designed to run on your own infrastructure. | iTop is an open-source, web-based IT service-management and CMDB platform designed around ITIL processes. |
