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Open source alert routing tools in 2026

The layer between monitoring and people: grouping, deduplication, silences, correlation and routing rules across many alert sources. This list has 7 alert routing tools. Of these, 7 are open source, 7 have a free plan and 7 can be self-hosted. Checked by hand on 30 September 2026.

  1. 1

    Alerta

    Self-hosted alert console that collects alerts from Prometheus, Nagios, Zabbix, CloudWatch and others, deduplicates and correlates them, and shows them in one web UI with an API and CLI.

    Free Open source (Apache-2.0) Self-hosted Alert routingDashboards
  2. 2

    ElastAlert 2

    Rule-based alerting on Elasticsearch and OpenSearch data: queries indices on a schedule and sends matches to email, Slack, PagerDuty and many other outputs.

    Free Open source (Apache-2.0) Self-hosted Alert routingLogsNotifications
  3. 3

    karma

    Dashboard for Prometheus Alertmanager that combines alerts from several Alertmanager instances, groups them and makes silences easy to manage.

    Free Open source (Apache-2.0) Self-hosted Alert routingDashboards
  4. 4

    Keep

    Open source alert management tool that pulls alerts from many monitoring sources, deduplicates and correlates them, and runs workflows on them. Acquired by Elastic in 2025.

    Free plan Open source (MIT) Self-hosted Alert routingRunbooks
  5. 5

    Prometheus Alertmanager

    Receives alerts from Prometheus and compatible systems, then groups, deduplicates, silences and routes them to email, Slack, PagerDuty, webhooks and other receivers.

    Free Open source (Apache-2.0) Self-hosted Alert routingNotifications
  6. 6

    Robusta

    Kubernetes alert enrichment and routing on top of Prometheus: adds pod logs, events and graphs to alerts and sends them to Slack, Teams and other sinks. Open source core plus a paid SaaS.

    Free plan Open source (MIT) Self-hosted KubernetesAlert routing
  7. 7

    Versus Incident

    Self-hosted alert relay that turns webhooks from Alertmanager, Grafana, Sentry and others into templated messages for Slack, Teams, Telegram and email, escalating to on-call tools if unacknowledged.

    Free plan Open source (MIT) Self-hosted Alert routingNotifications

Side by side

Tool Pricing Free plan Open source Self-hosted Many alert sourcesDeduplicationGrouping or correlationSilences or maintenanceRouting rulesInhibition or dependenciesEnrichmentHands off to on-callAlert consoleTwo-way sync
Alerta Free Yes Yes Yes YesYesYesYes--YesYesYesYes
ElastAlert 2 Free Yes Yes Yes NoYesYes---YesYesNo-
karma Free Yes Yes Yes NoYesYesYesNo--NoYes-
Keep Free plan Yes Yes Yes YesYesYesYesYes-YesYesYesYes
Prometheus Alertmanager Free Yes Yes Yes YesYesYesYesYesYes-YesYes-
Robusta Free plan Yes Yes Yes Yes-YesYesYes-YesYes--
Versus Incident Free plan Yes Yes Yes Yes------Yes--

Yes: confirmed in the tool's documentation. No: documented as not offered. -: not confirmed. Plans and prices change; check each tool's own site before you decide.

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