The PagerDuty workflow: Alert fires (from monitoring: Datadog, Grafana, CloudWatch, etc.) PagerDuty receives the alert Routes to on-call engineer (based on schedule/escalation policy) Notifies via: phone, SMS, push, Slack, email Engineer acknowledges or escalates Incident created, timeline tracked Critical features: on-call schedules, escalation policies, multi-channel notifications, incident timeline. ---

Best Open Source Alternatives to PagerDuty in 2026

TL;DR

PagerDuty Business is $41/user/month — for a 5-person on-call rotation, that's $2,460/year. The core features (alerts → on-call routing → escalation → acknowledgment) are well-covered by OSS alternatives. The best options: Grafana OnCall (strong integration with Grafana stack), Caronc/Zabbix Alert for existing Zabbix users, OpenStatus for lightweight monitoring + alerting, and Oncall by Amixr (now part of Grafana). For self-hosted incident management with a modern UX, Incident.io OSS and Rootly have OSS tiers too.

Key Takeaways

PagerDuty pricing: $21/user/month (Professional), $41/user/month (Business)
Grafana OnCall: best overall — rotation management, escalation, integrations
OpenStatus: monitoring + status page + alerting in one (simpler)
Uptime Kuma: excellent for monitoring + basic alerting (no on-call management)
Caronc/pagerduty alternative: for Nagios/Zabbix stacks
Self-hosted value: on-call management with full data control for ~$10/month

What PagerDuty Does

The PagerDuty workflow:

Alert fires (from monitoring: Datadog, Grafana, CloudWatch, etc.)
PagerDuty receives the alert
Routes to on-call engineer (based on schedule/escalation policy)
Notifies via: phone, SMS, push, Slack, email
Engineer acknowledges or escalates
Incident created, timeline tracked

Critical features: on-call schedules, escalation policies, multi-channel notifications, incident timeline.

The Alternatives

1. Grafana OnCall — Best Overall Replacement

Best for: Teams using the Grafana observability stack (Prometheus, Loki, Grafana).

Grafana OnCall started as Amixr.io and was acquired by Grafana Labs. It's now open source and integrated into Grafana Cloud.

# Self-host Grafana OnCall:
git clone https://github.com/grafana/oncall
cd oncall

# Quick start with Docker Compose:
COMPOSE_PROFILES=with_grafana docker compose up

# Or add to existing Grafana:
# Install plugin: grafana-oncall-app
# Configure with your Grafana URL + service account token

Grafana OnCall features:

On-call schedules with visual calendar
Escalation chains: notify A → if no response in 5min → notify B → page manager
Multiple notification channels: Slack, Telegram, phone (via Twilio), email, PagerDuty-compatible API
Alert grouping and noise reduction
Mobile app for acknowledgment
Integrations: Prometheus AlertManager, Grafana Alerts, Zabbix, Nagios, CloudWatch

# alertmanager.yml — route to Grafana OnCall:
receivers:
  - name: 'grafana-oncall'
    webhook_configs:
      - url: 'https://your-oncall.company.com/integrations/v1/alertmanager/YOUR_TOKEN/'
        send_resolved: true

route:
  receiver: 'grafana-oncall'
  group_by: ['alertname', 'cluster']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 4h

GitHub: grafana/oncall — 4K+ stars

2. OpenStatus — Monitoring + Alerting + Status Page

Best for: Smaller teams who want monitoring, alerting, and status page in one tool.

OpenStatus combines uptime monitoring, alerting, and public status pages. It's not a full PagerDuty replacement (no on-call scheduling), but covers the simpler "my site is down → alert me" use case beautifully.

# Self-host:
git clone https://github.com/openstatusHQ/openstatus
cd openstatus
# Docker Compose:
docker compose up -d

# Monitor setup in UI:
# + New Monitor → URL: https://api.yourapp.com/health
# → Check interval: every 1 minute
# → Regions: US East, EU West, Asia Pacific
# → Alert: email + Slack when status changes

OpenStatus features:

HTTP/TCP/DNS monitoring from multiple global regions
Status page (public-facing, shows incident history)
Incident creation and tracking
Email, Slack, webhook notifications
Synthetic monitoring

Best used with Grafana OnCall: OpenStatus handles monitoring → webhook → Grafana OnCall handles on-call routing.

GitHub: openstatusHQ/openstatus — 6K+ stars

3. Uptime Kuma — Simple but Excellent

Best for: Small teams that just need "alert me when X goes down."

Uptime Kuma is the most popular self-hosted monitoring tool on GitHub. It doesn't have on-call scheduling but has excellent notification integrations.

docker run -d \
  --restart=always \
  -p 3001:3001 \
  -v uptime-kuma:/app/data \
  --name uptime-kuma \
  louislam/uptime-kuma:1

# Access at http://localhost:3001

Notification integrations (50+ channels):

Slack, Discord, Telegram
PagerDuty (ironically — you can route Uptime Kuma alerts to PagerDuty)
Email (SMTP)
SMS via Twilio/Vonage
Gotify (self-hosted push)
Webhook (to any system)

Uptime Kuma limitation vs PagerDuty: No on-call scheduling. Everyone who's configured gets notified. For a solo developer or small team, this is fine. For teams with rotating on-call, use Grafana OnCall.

GitHub: louislam/uptime-kuma — 62K+ stars

4. Alertmanager + Routing Rules (DIY)

Best for: Teams already using Prometheus who want maximum control.

Prometheus Alertmanager handles alert routing, deduplication, grouping, and silencing. Add PagerDuty-compatible routing:

# alertmanager.yml
global:
  resolve_timeout: 5m
  slack_api_url: 'https://hooks.slack.com/services/...'

route:
  group_by: ['alertname', 'cluster', 'service']
  group_wait: 10s
  group_interval: 10m
  repeat_interval: 1h
  receiver: 'slack-default'
  routes:
    - match:
        severity: critical
      receiver: 'pagerduty-critical'
      continue: true  # also notify Slack
    - match:
        severity: warning
      receiver: 'slack-default'

receivers:
  - name: 'pagerduty-critical'
    pagerduty_configs:
      - service_key: 'YOUR_PAGERDUTY_KEY'  # or self-hosted Grafana OnCall

  - name: 'slack-default'
    slack_configs:
      - channel: '#alerts'
        title: '{{ .GroupLabels.alertname }}'
        text: '{{ range .Alerts }}{{ .Annotations.description }}{{ end }}'

This gives you alert routing logic without any third-party service. On-call scheduling still needs a tool (Grafana OnCall) or a simpler approach (Slack rotation bot).

5. Self-Hosted On-Call Schedule via Slack

For very small teams: a simple Slack bot handles on-call rotation cheaply.

// Minimal on-call bot (Next.js API route):
// Rotates through engineers based on week number
const ONCALL_SCHEDULE = [
  { name: 'Alice', userId: 'U012345', phone: '+1-555-0001' },
  { name: 'Bob',   userId: 'U012346', phone: '+1-555-0002' },
  { name: 'Carol', userId: 'U012347', phone: '+1-555-0003' },
];

export async function GET(req: Request) {
  const weekNum = getWeekNumber(new Date());
  const oncall = ONCALL_SCHEDULE[weekNum % ONCALL_SCHEDULE.length];
  return Response.json({ oncall });
}

// Alertmanager webhook receiver:
export async function POST(req: Request) {
  const alert = await req.json();
  const { oncall } = await getCurrentOncall();

  // Notify via Slack DM:
  await slack.chat.postMessage({
    channel: oncall.userId,
    text: `🚨 ALERT: ${alert.groupLabels.alertname}\n${alert.commonAnnotations.description}`,
  });

  // If not acknowledged in 5 min, escalate:
  setTimeout(async () => {
    const ack = await checkAcknowledgment(alert.id);
    if (!ack) await escalateAlert(alert);
  }, 5 * 60 * 1000);
}

For a 3-5 person team, this ~50 lines of code covers the core PagerDuty workflow at zero cost.

Comparison: Full Stack

Feature	PagerDuty	Grafana OnCall	OpenStatus	Uptime Kuma
On-call schedules	✅	✅	❌	❌
Escalation policies	✅	✅	❌	❌
Phone call alerts	✅	✅ (Twilio)	❌	✅ (Twilio)
Monitoring	✅ (basic)	✅ (via Grafana)	✅	✅
Status page	❌ (addon)	❌	✅	✅
Self-hosted	✅ (paid tier)	✅ (free)	✅ (free)	✅ (free)
Cost/user/month	$21-41	$0 self-hosted	$0 self-hosted	$0 self-hosted

Recommended stack:

Uptime Kuma (monitoring) → Grafana OnCall (routing/on-call) = full PagerDuty replacement for ~$15/month VPS

Explore more open source alternatives at OSSAlt.

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