Uptime monitor

Judgement

What it is

Building block

What it does

The GitHub Action at the core of Upptime that runs uptime checks, records response times and opens or closes GitHub issues for outages.

Adopt it when

You use Upptime and need to understand or customise its checking engine; most people use the Upptime template instead.

Watch out

Only meaningful as part of Upptime, and limited by GitHub Actions scheduling.

Ready for

Production-ready

Runs as

Cloud service

Built with

TypeScript and GitHub Actions

How established

Established: started 6 years ago, latest release v1.46.5.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Uptime monitor → TypeScript → Go → runs on a microchip

How compilers were built, back to punched paper tape

Open-source alternatives to Uptime monitor

1. 1
   Uptime Kuma louislam

   A fancy self-hosted monitoring tool

   Complete system Production-ready You want an easy, UptimeRobot-style monitor on your own server for a homelab or small business.

   ★ 93k MIT JavaScript Active, pushed 2 days ago
2. 2
   Upptime upptime

   ⬆️ GitHub Actions uptime monitor & status page by @AnandChowdhary

   Template or starter Production-ready You want a free status page and basic uptime checks without running any server.

   ★ 17k MIT Markdown Active, pushed 6 days ago
3. 3
   Gatus TwiN

   Automated developer-oriented status page with alerting and incident support

   Complete system Production-ready Developers want uptime checks defined as config in Git, with assertions on response content and timing.

   ★ 12k Apache-2.0 Go Active, pushed 5 days ago
4. 4
   Checkmate bluewave-labs

   Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Don't be shy, join here: https://discord.com/invite/NAb6H3UTjK :)

   Complete system Usable You want an Uptime Kuma-style monitor that also tracks server CPU, memory and disk.

   ★ 11k AGPL-3.0 TypeScript Active, pushed 2 days ago
5. 5
   Openstatus openstatusHQ

   Open-source status page, incident response and uptime monitoring

   Complete system Usable You need a public status page plus synthetic uptime checks and prefer an open-source vendor.

   ★ 9.2k AGPL-3.0 TypeScript Active, pushed 5 days ago
6. 6
   cState cstate

   🔥 Open source static (serverless) status page. Uses hyperfast Go & Hugo, minimal HTML/CSS/JS, customizable, outstanding browser support (IE8+), preloaded CMS, read-only API, badges & more.

   Template or starter Usable You want a fast static status page and are happy to post incidents by hand.

   ★ 2.9k MIT HTML Active, pushed 16 days ago
7. 7
   Peekaping 0xfurai

   Open Source Uptime Kuma Alternative

   Complete system Experimental You want Uptime Kuma-style monitoring with a stronger API and backend and accept a young project.

   ★ 1.2k MIT Go Active, pushed 15 days ago
8. 8
   Laravel-uptime-monitor spatie

   A powerful and easy to configure uptime and ssl monitor

   Building block Production-ready You run Laravel and want uptime checks inside your own app.

   ★ 1.1k MIT PHP Active, pushed 11 days ago

Commercial uptime monitors

1. 1
   Pingdom SolarWinds

   Swedish website monitoring software company

   Complete system Production-ready A business wants established external monitoring of website uptime and performance.

   25 readers a month Since 2005 Commercial
2. 2
   UptimeRobot UptimeRobot

   Start monitoring in 30 seconds. Use advanced SSL, keyword and cron monitoring. Get notified by email, SMS, Slack and more. Get 50 monitors for FREE!

   Complete system Production-ready You want simple, cheap or free monitoring of a handful of sites with alerts.

   Commercial
3. 3
   Better Stack Uptime Better Stack

   The most reliable uptime monitoring. Get 10 monitors, 10 heartbeats and a status page with 3-minute checks totally FREE.

   Complete system Production-ready A small engineering team wants uptime checks, on-call and status pages in one inexpensive tool.

   Commercial
4. 4
   Checkly Checkly

   The only monitoring platform built from the ground up to be operated by developers and agents to give teams a clear signal of application health.

   Developer tool Production-ready Developers want end-to-end tests of critical user flows running as production monitoring from the same code.

   Commercial