Cortex vs Netdata
A side-by-side comparison of two self-hosted monitoring & status options — licensing, setup difficulty, resource needs, and what each one replaces.
Netdata
Real-time per-second infrastructure monitoring
| Feature | Cortex | Netdata |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 90 · Excellent | 100 · Excellent |
| Category | Monitoring & Status | Monitoring & Status |
| License | Apache-2.0 | GPL-3.0 |
| Language | Go | Go |
| Setup difficulty | Hard | Easy |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker, kubernetes, helm | docker, bare-metal, kubernetes |
| GitHub stars | ★ 5,865 | ★ 80,637 |
| First released | 2016 | 2013 |
| Replaces | Datadog, Grafana Cloud | Datadog, New Relic |
What are Cortex and Netdata?
Cortex
Cortex provides a horizontally scalable, highly available, multi-tenant, long-term store for Prometheus metrics. It offers a single API endpoint for querying and writing time series data across clusters.
- Multi-tenant metrics storage
- Horizontally scalable
- Prometheus-compatible API
- Long-term retention
Netdata
Netdata is a real-time monitoring agent that collects thousands of metrics per second and visualizes them with zero configuration. It targets administrators who want instant, granular system insight. It is deployed via Docker or native packages.
- Per-second real-time metrics
- Zero-configuration auto-discovery
- Built-in anomaly detection
- Thousands of collectors
Cortex vs Netdata: key differences
Both projects are written in Go. Licensing differs — Apache-2.0 for Cortex versus GPL-3.0 for Netdata. Netdata is the lighter option, starting around 256 MB of RAM against 1,024 MB for Cortex. Netdata is the more established project (first released 2013), while Cortex arrived in 2016. Netdata has the considerably larger community, at 80,637 GitHub stars versus 5,865.
Why pick each one
Choose Cortex if…
- Built for very large scale
- True multi-tenancy
Watch out for
- Operationally heavy
- Overkill for small setups
Choose Netdata if…
- Instant insight out of the box
- Beautiful real-time charts
- Easy install
Watch out for
- Long retention needs tuning
- Cloud features are commercial
Frequently asked questions
Is Cortex or Netdata better?
Netdata is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Cortex if its specific feature set fits your needs better.
Are Cortex and Netdata free and open-source?
Yes. Cortex is licensed under Apache-2.0 and Netdata under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Cortex and Netdata with Docker?
Cortex: yes. Netdata: yes.
Which is lighter on resources, Cortex or Netdata?
Netdata has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for Cortex. Real-world usage depends on library size, user count, and enabled features.