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Callu

Free plan APISelf-hostedWeb

What Callu is

Callu is a self-hosted, single-tenant incident management and on-call platform for organizations that want to run it on their own infrastructure. It is free and open source under the MIT License, with no per-seat fees and a listed price of $0 per seat. Its incident tools include a six-state lifecycle, an append-only timeline, notes, manual escalation and duplicate suppression. On-call schedules support timezone-aware rotations and overrides, with ordered escalation policies that can target users, schedules or teams.

Callu accepts alerts through service and application webhooks, with API keys, optional HMAC, rate limiting and JSONPath templates. It lists inbound support for Prometheus, Grafana and generic JSON, and notification channels including email, SMS, voice, in-app push, Slack, Teams and webhooks. Phone paging and per-incident WebRTC war rooms are core capabilities; self-hosted Asterisk voice paging is also listed. Service features include dependency graphs, HTTP health checks, public status pages, uptime history and maintenance windows. Reporting covers MTTA and MTTR summaries, incident trends, severity distribution, service uptime and team performance. Getting started requires Docker and Docker Compose, with PostgreSQL included in the architecture. The interface is available in English and Turkish. Telemetry can go to the operator’s own Jaeger instance or be turned off.

Who it suits

Callu suits teams that want to self-host incident response and on-call tools, particularly regulated, air-gapped or sovereignty-conscious organizations. It may also suit teams that need integrated alerting, status communication, voice paging and post-incident reporting.

What it does well

Free and open source under the MIT License, with no per-seat fees.
Timezone-aware on-call rotations support overrides.
Escalation policies can target users, schedules or teams.
Includes phone paging and per-incident WebRTC war rooms.
Public status pages include uptime history and email subscribers.
Telemetry can be sent to your Jaeger instance or turned off.

What to know first

Deployment requires Docker and Docker Compose.
The mobile app is planned, rather than listed as available.
Webhook and callback HMAC is optional while mandatory HMAC matures.

Limits

The Free & open source plan is listed as free and states no limits. Mandatory webhook and callback HMAC is still maturing; HMAC is currently optional.

Plans

Plan	Billed and limits	Price
Free & open source	MIT licensed · self-hosted · no per-seat fees · no limits stated	Free

As callu.app lists them, read 8 Oct 2026. The maker's own page has the final word.

Getting started

Open Callu’s website and follow the quick start.
Prepare Docker and Docker Compose.
Run the published images as the seven-service Docker stack.
Use the included PostgreSQL architecture for the deployment.
Configure alert ingestion, schedules, escalation policies and notification channels.

Verdict

Choose Callu if you want a free, MIT-licensed incident platform that your organization can self-host, with on-call scheduling, escalation, alerting and status tools. Teams that need a mobile app should account for its planned status, and deployment requires Docker and Docker Compose.

Questions

Is Callu free?

Yes. It is free and open source under the MIT License, with a listed price of $0 per seat and no per-seat fees.

How is Callu deployed?

Callu is self-hosted. Its quick start requires Docker and Docker Compose and uses a seven-service stack; PostgreSQL is part of the architecture.

Which alert and notification integrations are listed?

Inbound alerts support Prometheus, Grafana, generic JSON and webhooks. Notification channels include email, SMS, voice, in-app push, Slack, Teams and webhooks.

Does Callu have a mobile app?

A mobile app is listed as planned on the roadmap.

What language options does Callu provide?

The interface is available in English and Turkish, with a per-user locale preference.

Can Callu telemetry be controlled?

OpenTelemetry exports can go to the operator’s own Jaeger instance or be turned off; the site says there is no phone-home telemetry.

Facts from Callu's own pages

Alert ingestion: Callu accepts per-service and application webhooks, with API keys, optional HMAC, rate limiting, and JSONPath templates. · callu.app, 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, 8 Oct 2026
Deployment: The quick start requires Docker and Docker Compose and describes a seven-service Docker stack. · callu.app, 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, 8 Oct 2026
Incident management: Features include a six-state incident lifecycle, an append-only timeline, notes, manual escalation and duplicate suppression. · callu.app, 8 Oct 2026
Integrations: Inbound alerts support Prometheus, Grafana, generic JSON and webhooks; organization notification channels include Slack, Teams and webhooks. · callu.app, 8 Oct 2026
Language: The site says the interface is available in English and Turkish, with a per-user locale preference. · callu.app, 8 Oct 2026
License: Callu is free and open source under the MIT License. · callu.app, 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, 8 Oct 2026
Mobile: A mobile app is listed as planned on the roadmap. · callu.app, 8 Oct 2026
Notifications: Notification channels include email, SMS, voice, in-app push, Slack, Teams and webhooks. · callu.app, 8 Oct 2026
On-call: Schedules support timezone-aware rotations and overrides, with ordered escalation policies for users, schedules or teams. · callu.app, 8 Oct 2026
Pricing: The site says there are no per-seat fees and lists $0 per seat. · callu.app, 8 Oct 2026
Product: Callu is a self-hosted, single-tenant incident management and on-call platform. · callu.app, 8 Oct 2026
Reporting: Reporting includes MTTA and MTTR summaries, incident trends, severity distribution, service uptime, and team performance. · callu.app, 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, 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, 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, 8 Oct 2026
Status pages: Callu supports public status pages with components, updates, uptime history, and email subscribers. · callu.app, 8 Oct 2026
Telemetry: OpenTelemetry exports can go to the operator's Jaeger instance, or be turned off; the site says there is no phone-home telemetry. · callu.app, 8 Oct 2026
Voice and video: Phone paging and per-incident WebRTC war rooms are included as core capabilities, and self-hosted Asterisk voice paging is listed as shipped. · callu.app, 8 Oct 2026
What it does: Callu is a single-tenant incident management and on-call platform designed to run on your own infrastructure. · callu.app, 8 Oct 2026

Where Callu stands on Freedom251

IT Incident Management Software#7 of 31