Cortex vs Apache SkyWalking
A side-by-side comparison of two self-hosted monitoring & status options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Cortex | Apache SkyWalking |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 90 · Excellent | 97 · Excellent |
| Category | Monitoring & Status | Monitoring & Status |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | Java |
| Setup difficulty | Hard | Hard |
| Min. RAM | 1,024 MB | 2,048 MB |
| Deployment | docker, kubernetes, helm | docker, kubernetes, helm |
| GitHub stars | ★ 5,865 | ★ 24,962 |
| First released | 2016 | 2015 |
| Replaces | Datadog, Grafana Cloud | New Relic, Datadog |
What are Cortex and Apache SkyWalking?
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
Apache SkyWalking
Apache SkyWalking is an APM and observability platform for distributed systems, especially microservices and cloud-native architectures. It provides tracing, metrics, logging, and service topology analysis.
- Distributed tracing and metrics
- Service topology maps
- eBPF and OTel integration
- Alerting engine
Cortex vs Apache SkyWalking: key differences
Cortex is written in Go, while Apache SkyWalking is built with Java. Cortex is the lighter option, starting around 1,024 MB of RAM against 2,048 MB for Apache SkyWalking. Apache SkyWalking has the considerably larger community, at 24,962 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 Apache SkyWalking if…
- Full observability suite
- Strong Apache governance
Watch out for
- Steep learning curve
- Storage backend required
Frequently asked questions
Is Cortex or Apache SkyWalking better?
Neither is universally better. Apache SkyWalking has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Cortex and Apache SkyWalking free and open-source?
Yes. Cortex is licensed under Apache-2.0 and Apache SkyWalking under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Cortex and Apache SkyWalking with Docker?
Cortex: yes. Apache SkyWalking: yes.
Which is lighter on resources, Cortex or Apache SkyWalking?
Cortex has the smaller minimum footprint at 1,024 MB of RAM, compared to about 2,048 MB for Apache SkyWalking. Real-world usage depends on library size, user count, and enabled features.