Open-source Checkly alternatives

Openstatus is an uptime monitoring and status page platform, open source and built around infrastructure as code. Monitors, status pages and alert channels are written in YAML or Terraform and applied through the CLI or CI, and they can also be operated by AI assistants such as Claude, ChatGPT or Cursor through an MCP server.

The platform combines status pages and monitoring in one tool. Status pages can use custom domains and password protection, schedule maintenance windows, and notify subscribers by email, RSS or webhooks. Monitoring checks servers, websites and APIs from 28 regions across three cloud providers in parallel, with alerts through Slack, Discord, PagerDuty, email and more. Incident management lets teams open and manage incidents from the dashboard or Slack, with severity, a commander and a full timeline.

Openstatus is available as a managed service or can be self-hosted under the AGPL-3.0 licence, and private locations run in a very small Docker image. The README highlights flat pricing with unlimited members, with a JSON CLI, typed API and audit log for every change. It suits engineering teams that want monitoring configured in version control.

OneUptime is an open-source monitoring and observability platform that aims to replace a shelf of separate SaaS tools. It covers uptime monitoring, status pages, on-call and alerting, incident management, logs, traces, metrics, APM and error tracking in one application, and adds AI-assisted features such as helping find the root cause and proposing a fix.

Its README maps each module to the tools it can replace: Pingdom and UptimeRobot for uptime checks across websites, APIs, ports, SSL and DNS, StatusPage.io for branded public and private status pages, PagerDuty and Opsgenie for schedules, escalation policies and SMS, call, push or Slack alerts, Incident.io for declaring and triaging incidents with post-mortems, Datadog and New Relic for traces and dashboards, Loggly for logs, and Sentry for exceptions.

The Community Edition is open source under Apache 2.0 and free to self-host, and OneUptime Cloud offers a free-forever plan with no credit card. It is written in TypeScript. It suits small and mid-sized engineering teams that want one platform for reliability work rather than integrating many vendors.

sitespeed.io is open-source software for measuring web performance. You run it against a page or a set of pages, and it drives real browsers to measure how fast they load, producing an HTML report that includes Core Web Vitals and a video recording, so you can debug a slow page or compare changes over time.

It can be installed with Docker or Node.js, supports basic and advanced configuration, and includes guidance for mobile testing. Teams run it from CI or on a schedule to monitor performance continuously and catch regressions. The repository lists metrics, performance analysis and dashboards among its topics, and the project is active on Bluesky and Mastodon with a public changelog.

sitespeed.io is written in JavaScript and licensed under MIT. It runs on your own machines or servers, so no hosted account is needed. It suits front-end developers, performance engineers and operations teams that want self-controlled performance budgets and monitoring.