Alertmanager vs Mailrise
A side-by-side comparison of two self-hosted monitoring & status options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Alertmanager | Mailrise |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 92 · Excellent | 48 · Fair |
| Category | Monitoring & Status | Monitoring & Status |
| License | Apache-2.0 | MIT |
| Language | Go | Python |
| Setup difficulty | Medium | Easy |
| Min. RAM | 64 MB | 64 MB |
| Deployment | docker, kubernetes, binary | docker |
| GitHub stars | ★ 8,627 | ★ 1,592 |
| First released | 2015 | 2021 |
| Replaces | PagerDuty, Opsgenie | PagerDuty |
What are Alertmanager and Mailrise?
Alertmanager
Alertmanager handles alerts sent by Prometheus and other clients, taking care of deduplication, grouping, and routing to receivers such as email, Slack, or PagerDuty. It also supports silences and inhibition rules.
- Alert deduplication and grouping
- Flexible routing trees
- Silences and inhibition
- Many notification integrations
Mailrise
Mailrise acts as an SMTP server that receives email alerts from legacy systems and forwards them as push notifications through Apprise. It bridges old monitoring tools to modern notification channels.
- SMTP-to-push bridge
- Apprise integration
- Many notification targets
- Tiny footprint
Alertmanager vs Mailrise: key differences
Alertmanager is written in Go, while Mailrise is built with Python. Licensing differs — Apache-2.0 for Alertmanager versus MIT for Mailrise. Alertmanager is the more established project (first released 2015), while Mailrise arrived in 2021. Alertmanager has the considerably larger community, at 8,627 GitHub stars versus 1,592.
Why pick each one
Choose Alertmanager if…
- Powerful routing logic
- Standard in the Prometheus stack
Watch out for
- YAML config can get complex
- Tied to Prometheus ecosystem
Choose Mailrise if…
- Released under the MIT license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Active community (1.6k GitHub stars)
Frequently asked questions
Is Alertmanager or Mailrise better?
Neither is universally better. Alertmanager has the larger community, while Mailrise is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Alertmanager and Mailrise free and open-source?
Yes. Alertmanager is licensed under Apache-2.0 and Mailrise under MIT. Both can be self-hosted at no software cost.
Can I run Alertmanager and Mailrise with Docker?
Alertmanager: yes. Mailrise: yes.