10 Best Open-Source On-Call Management Tools
Cross-posted from the Fluidify blog.
What "open-source oncall tool" actually covers
Before the list: these ten tools solve different slices of the same broader problem, and conflating them is how teams end up self-hosting three separate projects to replicate what one commercial platform does out of the box. Three categories show up below:
Scheduling + escalation platforms manage who's on call, rotate them, and escalate a page through a policy until someone acknowledges it.
Alert routers take signals from monitoring systems, deduplicate and classify them, and decide who or what gets notified, without necessarily owning the schedule itself.
Monitoring systems with alerting built in generate the signals in the first place and can notify people directly, but weren't built primarily as on-call platforms.
Key takeaways
Most lists of "open-source on-call tools" mix genuinely different categories: full scheduling-plus-escalation platforms, alert routers that assume you bring your own scheduling, and monitoring systems with paging bolted on. This list says which is which.
One thing worth knowing before you pick: Grafana OnCall, previously a common default, was archived in March 2026 and isn't a safe choice for a new deployment, it's covered below along with the rest.
FluidifyAI Regen is the only entry here that covers scheduling, escalation, and incident coordination in one self-hosted, actively maintained package, with no per-seat cost, if you want one tool instead of stitching together two or three.
Quick comparison
| Tool | License | Category | Scheduling | Escalation | Incident coordination | Status (2026) |
|---|---|---|---|---|---|---|
| FluidifyAI Regen | AGPLv3 | Full platform | Yes | Yes | Yes, with AI post-mortems | Active |
| GoAlert | Apache-2.0 | Scheduling + escalation | Yes | Yes | No | Active |
| LinkedIn Oncall + Iris | Apache-2.0 | Scheduling + escalation (2 repos) | Yes | Yes | No | Low activity |
| Keep | AGPLv3/MIT (mixed) | Alert router / AIOps | Basic | Workflow-based | Partial | Active |
| Alerta | MIT | Alert router | No | No | No | Low activity |
| Grafana OnCall | Apache-2.0 | Scheduling + escalation | Yes | Yes | No | Archived March 2026 |
| Cabot | MIT | Monitoring + alerting | No | Basic | No | Dormant |
| Prometheus Alertmanager + Karma | Apache-2.0 | Alert router | No | Routing rules | No | Active |
| Zabbix | GPLv2 | Monitoring + alerting | No | Escalation trees | No | Active |
| Icinga 2 | GPLv2 | Monitoring + alerting | No | Notification rules | No | Active |
1. FluidifyAI Regen
Category: full platform. Perfect for: teams that want scheduling, escalation, and incident coordination in one self-hosted tool without stitching together two or three open-source projects.
Notable features
Alert ingestion from Prometheus Alertmanager, Grafana, AWS CloudWatch, or a generic webhook, with pattern matching that learns from historical incidents.
On-call scheduling with layer-based rotations, overrides, holidays, exceptions, and leave, with timezone and multi-language support.
Multi-step escalation policies with configurable timeouts per step.
Immutable incident timelines with bidirectional Slack and Microsoft Teams sync, including bot commands and Adaptive Cards.
AI-generated incident summaries and post-mortems, bring-your-own-key with OpenAI, Anthropic, or Ollama, so nothing leaves your infrastructure that you don't choose to send.
Free SSO/SAML on the self-hosted tier.
One-click migration from Grafana OnCall, Opsgenie (sunsetting April 2027), or PagerDuty, useful if you're moving off an archived or sunsetting tool rather than building from scratch.
Where it falls short: a fuller platform than teams who just want a minimal scheduling-and-paging backbone need, more moving parts to run than GoAlert's single-binary footprint.
Pricing: free under AGPLv3 self-hosted, unlimited users and schedules. Managed Cloud starts at \(100/month (Pro), \)200/month (Business). Enterprise is a custom contract for SCIM, audit logs, and SOC 2 requirements. Full pricing breakdown if you want the numbers at your own team size.
For the fuller picture beyond this entry, see What Is FluidifyAI Regen?
2. GoAlert
Category: scheduling + escalation. Perfect for: teams that want a minimal, self-hosted paging backbone and are comfortable building incident coordination separately.
Notable features: built by Target's engineering team, ships as a single Go binary with a PostgreSQL backend, one of the simpler self-hosted deployments on this list. Handles rotations, escalation policies, and multi-channel notification (voice, SMS, push) cleanly.
Where it falls short: no incident coordination layer, no timeline, no post-mortem tooling, that's a deliberate scope choice, not a bug, but it means GoAlert alone doesn't replace a full incident platform. Voice and SMS require your own Twilio account with real credentials and funds; if that's misconfigured, notification rules can silently fail to fire rather than erroring loudly, worth testing before you rely on it.
Pricing: free, self-hosted only, no managed offering.
3. LinkedIn Oncall + Iris
Category: scheduling + escalation, split across two repositories. Perfect for: teams with the engineering capacity to integrate and operate two separate open-source projects for the sake of using something battle-tested at LinkedIn's scale.
Notable features: Oncall handles the scheduling calendar, including follow-the-sun rotations. Iris is the escalation engine, built to process very high message volume reliably. Both are genuinely proven at scale internally at LinkedIn.
Where it falls short: the two projects need to be wired together and operated as separate services, and community activity has slowed considerably since their initial release. Expect to do real integration work, not a docker-compose-and-go setup.
Pricing: free, self-hosted only.
4. Keep
Category: alert router / AIOps. Perfect for: teams whose main pain point is too many duplicate and unrelated alerts arriving from multiple monitoring sources, before the question of who gets paged even comes up.
Notable features: correlates and deduplicates alerts across sources, with workflow automation that can trigger notifications, tickets, or other actions based on rules you define.
Where it falls short: on-call scheduling is present but secondary to its correlation and workflow features, not a full rotation-and-escalation system on its own.
Pricing: free, open-source, with a hosted option available.
5. Alerta
Category: alert router. Perfect for: teams that already have scheduling and escalation solved elsewhere and just need a central place to receive, deduplicate, and route alerts from multiple monitoring sources.
Notable features: a clean, purpose-built alert management API and UI that many other tools integrate with as a routing layer.
Where it falls short: no scheduling or escalation of its own; it's a component you pair with something else, not a standalone on-call tool.
Pricing: free, self-hosted only.
6. Grafana OnCall
Category: scheduling + escalation. Status: archived: Grafana OnCall's open-source project entered maintenance mode in 2025 and was formally archived in March 2026. Existing self-hosted deployments keep running, but there's no ongoing development, and starting a new production deployment on it in 2026 means adopting a project with no active maintainer.
Notable features (historical): tight integration with Grafana dashboards and alerting, useful if your monitoring stack was already Grafana-centric.
Where it falls short now: it's the reason this list exists in its current form. Teams that built their on-call setup around Grafana OnCall are the exact audience evaluating GoAlert, Regen, and the LinkedIn tools as a replacement in 2026.
Pricing: free, self-hosted, archived, so no future pricing changes, but also no future development.
7. Cabot
Category: monitoring + alerting. Perfect for: small teams that want a lightweight, self-hosted check-and-alert system and don't need a dedicated on-call platform.
Notable features: built by Arachnys as a self-hosted alternative to combining Nagios-style checks with a paging layer, simple to run.
Where it falls short: development activity has been minimal for an extended period; treat it as a small, stable utility rather than an actively evolving platform, and verify current maintenance status before depending on it.
Pricing: free, self-hosted only.
8. Prometheus Alertmanager + Karma
Category: alert router. Perfect for: teams already running Prometheus who need alert grouping, silencing, and routing, with a usable dashboard on top (Karma) instead of Alertmanager's bare UI.
Notable features: Alertmanager's routing tree and silencing are mature and widely used; Karma adds a much more usable interface for triaging active alerts across multiple Alertmanager instances.
Where it falls short: this pairing routes alerts, it doesn't schedule who's on call or manage escalation timeouts. Most teams pair it with a dedicated on-call tool downstream.
Pricing: free, self-hosted only, part of the CNCF ecosystem.
9. Zabbix
Category: monitoring + alerting. Perfect for: infrastructure teams that want monitoring and basic escalation in one system and don't need dedicated on-call scheduling software.
Notable features: mature monitoring platform with configurable escalation trees for notifications tied directly to check failures.
Where it falls short: escalation here is a monitoring feature, not a purpose-built on-call system; no shift rotation concept, no override handling, no incident timeline.
Pricing: free, open-source, GPLv2.
10. Icinga 2
Category: monitoring + alerting. Perfect for: teams already invested in the Nagios/Icinga ecosystem who want notification rules alongside their existing checks rather than a separate on-call platform.
Notable features: flexible notification rules tied to host and service checks, mature plugin ecosystem.
Where it falls short: same gap as Zabbix, monitoring-native alerting rather than dedicated scheduling and escalation.
Pricing: free, open-source, GPLv2.
FAQ
Why is FluidifyAI Regen the top pick on this list? It's the only entry that covers scheduling, escalation, and incident coordination, with AI-generated post-mortems, in one self-hosted, actively developed package and no per-seat pricing. Everything else here either does less (GoAlert, the alert routers) or wasn't built as a dedicated on-call platform in the first place (the monitoring tools).
Which of these has the lowest operational overhead to self-host? GoAlert, by design: a single binary plus PostgreSQL. Regen and Keep are close behind with straightforward container-based deployment. The monitoring-plus-alerting tools (Zabbix, Icinga 2) carry more operational weight because you're running full monitoring infrastructure, not just an on-call layer.
Can I combine an alert router like Alerta or Karma with GoAlert? Yes, that's a common pattern: use the router for deduplication and classification upstream, then hand the classified alert to a scheduling-and-escalation tool to decide who gets paged. It's more moving parts to operate than a single platform, in exchange for choosing best-of-breed at each layer.
What's the best open-source replacement for Grafana OnCall now that it's archived? FluidifyAI Regen and GoAlert are the two actively maintained full or near-full alternatives; Regen adds incident coordination and AI post-mortems that GoAlert doesn't attempt, GoAlert is the more minimal, single-purpose option. Grafana OnCall itself will keep running if you already have it deployed, but with no active development, security patches and bug fixes won't be coming, treat it as a deprecation clock, not an emergency.
Choosing between them
If the goal is one self-hosted tool that covers scheduling, escalation, and incident response without assembling two or three separate open-source projects, FluidifyAI Regen and GoAlert are the two to evaluate first, and the choice mostly comes down to whether you need incident coordination and AI post-mortems (Regen) or want the smallest possible footprint and are fine building coordination separately (GoAlert). If you're migrating off an archived or sunsetting platform specifically, Regen's 1-click migration from Grafana OnCall, Opsgenie, and PagerDuty is worth checking before you rebuild schedules by hand.
If you also want commercial platforms in the comparison, not just open-source, see our broader best on-call management tools for 2026.
