2023 · Creator

Sitemon

Lightweight website uptime monitor written in Go. Sends alerts via Slack, email, or webhook when a site goes down.

The challenge

Most uptime monitors are SaaS subscriptions priced per check, with vendor lock-in and noisy alerting. Self-hosted options are heavy (Go services with Postgres + Redis just to ping URLs).

The result

A single Go binary, single-file SQLite, sub-1MB memory footprint. Slack, email, or webhook alerts, configurable cadence, and zero runtime dependencies. Drop it on a VPS and forget it.

Year: 2023
Role: Creator
Stack: 3 teches
Status: Published

Overview

Sitemon is a minimal, self-hosted uptime monitoring tool written in Go. It polls a list of URLs on a configurable interval and sends notifications when status changes.

Why Go

A single statically-linked binary with no runtime dependencies. Easy to deploy on any VPS with a systemd unit or as a Docker container.

Features

HTTP/HTTPS monitoring with TLS expiry warnings
Configurable check intervals per URL
Slack, email, and generic webhook notifications
Status page output (static HTML)
SQLite history for downtime reports

Config

YAML config file. Zero external services required.

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