Open Source Cron Monitoring Tools
If you are looking for an open source cron monitoring tool, the options are limited. Most solutions are either SaaS-based with recurring costs, limited in features, or no longer actively maintained.
Why open source?
Full Data Control
Your execution logs and job configurations stay on your own infrastructure. No data leaves your servers.
No Recurring Costs
No subscription, no per-monitor pricing, no usage limits. Free forever under GPL-3.0.
Flexibility
Modify, extend and integrate as needed. Full source code access on GitHub.
Self-Hosted
Deploy on your own servers. No vendor lock-in, no external dependencies, no account required.
CronManager vs SaaS alternatives
Cronitor, Healthchecks.io
Cloud-based monitoring services. Useful for simple ping-based checks, but require sending data to external servers, charge per monitor at scale, and limit execution log depth on free plans.
CronManager
Self-hosted, open source, actively maintained. Full execution output capture, multi-server monitoring, failure alerts, execution limits and OIDC/SSO — all without a subscription.
CronManager highlights
Execution History & Logs
Full stdout/stderr capture for every run. Timeline charts, swimlane views and KPI cards per job.
Failure Alerts
Email notifications on non-zero exit codes. Configurable per job.
Multi-Host Monitoring
Monitor cron jobs across multiple Linux servers from one dashboard. SSH-based remote execution included.
OIDC / SSO
Integrate with Authentik, Keycloak or any standards-compliant identity provider.