Callu
What it is
Callu is a self-hosted, single-tenant incident management and on-call platform for an organization’s own infrastructure. It is free and open source under the MIT License, with no per-seat fees and a listed cost of $0 per seat. Incident handling includes a six-state lifecycle, append-only timeline, notes, manual escalation, and duplicate suppression. Schedules support timezone-aware rotations and overrides, while escalation policies can target users, schedules, or teams. Alerts arrive through Prometheus, Grafana, JSON, and webhooks, with API keys, optional HMAC, rate limiting, and JSONPath templates. Notifications include email, SMS, voice, push, Slack, Teams, and webhooks. Callu also lists phone paging, WebRTC war rooms, status pages, health checks, service dependencies, maintenance windows, reporting, and post-incident reviews. Deployment uses Docker and Docker Compose with PostgreSQL in the architecture. A mobile app is planned, and mandatory webhook HMAC is still maturing.
For and against
For
- MIT-licensed and free with no seat fees
- Timezone-aware schedules and escalation policies
- Broad alert and notification channels
- Self-hosted phone paging and WebRTC rooms
- Public status pages and incident reporting
Against
- Docker and Docker Compose are required
- Mobile app is only planned
- Webhook HMAC is currently optional
- Single-tenant deployment is organization-specific
The verdict
Callu offers a broad incident-response system without per-seat pricing, provided the organization manages deployment. Its self-hosted design emphasizes control, integrations, communications, and reporting.
Who it suits
Callu suits self-hosting, regulated, air-gapped, and sovereignty-conscious teams. It is intended for organizations wanting incident response and on-call data on their own infrastructure.
Plans and prices
Free & open source
MIT licensed · self-hosted · no per-seat fees · no limits stated
Read 8 Oct 2026 · callu.app
On the record
- Alert ingestion
- Callu accepts per-service and application webhooks, with API keys, optional HMAC, rate limiting, and JSONPath templates.callu.app · read 8 Oct 2026
- Data control
- Callu is designed for one deployment per organization, and the site says telemetry can be sent to the operator’s own Jaeger instance or turned off.callu.app · read 8 Oct 2026
- Deployment
- The quick start requires Docker and Docker Compose and describes a seven-service Docker stack.callu.app · read 8 Oct 2026
- Deployment requirements
- The quick start requires Docker and Docker Compose and uses published images; PostgreSQL is part of the architecture.callu.app · read 8 Oct 2026
- Incident management
- Features include a six-state incident lifecycle, an append-only timeline, notes, manual escalation and duplicate suppression.callu.app · read 8 Oct 2026
- Integrations
- Inbound alerts support Prometheus, Grafana, generic JSON and webhooks; organization notification channels include Slack, Teams and webhooks.callu.app · read 8 Oct 2026
- Language
- The site says the interface is available in English and Turkish, with a per-user locale preference.callu.app · read 8 Oct 2026
- License
- Callu is free and open source under the MIT License.callu.app · read 8 Oct 2026
- License and audience
- Callu is MIT licensed and describes itself as built for self-hosting, regulated, air-gapped, and sovereignty-conscious teams.callu.app · read 8 Oct 2026
- Mobile
- A mobile app is listed as planned on the roadmap.callu.app · read 8 Oct 2026
- Notifications
- Notification channels include email, SMS, voice, in-app push, Slack, Teams and webhooks.callu.app · read 8 Oct 2026
- On-call
- Schedules support timezone-aware rotations and overrides, with ordered escalation policies for users, schedules or teams.callu.app · read 8 Oct 2026
- Pricing
- The site says there are no per-seat fees and lists $0 per seat.callu.app · read 8 Oct 2026
- Product
- Callu is a self-hosted, single-tenant incident management and on-call platform.callu.app · read 8 Oct 2026
- Reporting
- Reporting includes MTTA and MTTR summaries, incident trends, severity distribution, service uptime, and team performance.callu.app · read 8 Oct 2026
- Roadmap limits
- The site lists a mobile app as planned and says mandatory webhook and callback HMAC is still maturing; HMAC is currently optional.callu.app · read 8 Oct 2026
- Security
- The site describes encrypted provider, SMTP and SIP credentials, invitation-only onboarding, rotating refresh cookies and a tamper-evident audit trail.callu.app · read 8 Oct 2026
- Status and services
- The platform includes a service dependency graph, HTTP health checks, public status pages, uptime history and maintenance windows.callu.app · read 8 Oct 2026
