BoxWatch vs Sensu
Sensu is an open-source observability pipeline designed for infrastructure monitoring at scale. It gives teams a programmable event pipeline where agents collect metrics and run checks, then route results through filters, mutators, and handlers. BoxWatch is a hosted SaaS product focused on Linux server monitoring: you install a lightweight agent and the rest (alerting, dashboards, uptime tracking, status pages) is managed for you. Both products support agent-based host monitoring and alerting, but they sit at very different points on the complexity and control spectrum.
Quick verdict
Sensu is the right pick for engineering teams that need deep customizability, self-hosting on their own infrastructure, an open-source foundation they can extend, or monitoring at hundreds to thousands of nodes where per-node pricing is acceptable. BoxWatch is the better fit for teams that want to be up and running in under five minutes, pay a predictable flat monthly price regardless of host count, and get built-in status pages, uptime badges, SLA reports, and cron heartbeat monitoring without writing any pipeline code.
Pricing
| Plan | Sensu | BoxWatch |
|---|---|---|
| Free tier | Free up to 100 nodes (no time limit) | Hobby: $0 (5 servers) |
| Entry paid | Pro: $3/node/mo (100-node minimum = $300/mo) | Pro: $13/mo (25 servers) |
| Mid tier | Pro: ~$75/mo for 25 nodes | Team: $29/mo (100 servers) |
| Scale tier | Enterprise: $5/node/mo (300-node minimum = $1,500/mo) | Scale: $79/mo (unlimited servers) |
| Pricing model | Per node, billed annually | Flat per plan, any number of servers up to limit |
| Self-hosted option | Yes (OSS core is free) | No (SaaS only) |
Feature comparison
When Sensu is the better choice
- You want to self-host your entire monitoring stack and keep all data on your own infrastructure. Sensu Go can run on-premises or in your own cloud with no dependency on an external SaaS.
- You need a programmable pipeline: custom check plugins, metric routing to InfluxDB or Prometheus, auto-remediation scripts, and deep integration with tools like Ansible, Kubernetes, or ServiceNow.
- You have a large fleet (hundreds of nodes) and the open-source free tier (up to 100 nodes) or the ability to negotiate volume pricing matters more than a flat fee.
- Your team already manages SSO via LDAP, Active Directory, or OIDC and needs native enterprise authentication built in.
When BoxWatch is the better choice
- You want a flat monthly price that does not grow with your host count. At 25 servers BoxWatch Pro costs $13/mo vs roughly $75/mo for Sensu Pro.
- You need built-in status pages, uptime badges, SLA tracking, and scheduled reports without wiring up third-party tools.
- Your cron jobs and background tasks need dead-man heartbeat monitoring with zero configuration beyond a curl call.
- You have no infrastructure team to operate and upgrade a self-hosted backend. BoxWatch is fully managed.
- You need disk-full forecasting baked in rather than configured from scratch via community plugins.
FAQ
Does Sensu require running your own backend server?
Yes. Sensu Go consists of a backend, one or more agents, and the sensuctl CLI. You must deploy and operate the backend yourself, whether on a VM, in containers, or in Kubernetes. BoxWatch has no backend for you to manage.
Is Sensu truly open source?
The Sensu Go core (agent, backend, sensuctl) is open source under the MIT license and available on GitHub. However, the web UI, SSO authentication, and some commercial features are only available in the paid tiers. The free tier supports up to 100 nodes with commercial features included.
Can Sensu monitor HTTP endpoints the way BoxWatch synthetic checks do?
Sensu can run HTTP checks using community plugins installed as assets from Bonsai (the Sensu asset hub). These run from your own agents, so they can reach internal endpoints, the same as BoxWatch. However, there is no built-in point-and-click synthetic check UI. You configure checks as code using sensuctl or the API.