Applegate Monitor — Know Before Your Users Do

• Author Richard Applegate
• Version v3.4.0
• Live demo uptime.richardapplegate.io
• Source GitHub

Self-hosted Source-available Free for personal use Multi-tenant Omada SDN

What is Applegate Monitor?

Applegate Monitor gives you a clear, real-time picture of every service you run, from websites and mail servers to DNS, VPN endpoints, IoT devices and network gear, all from a single deployment. No SaaS. No monthly fees. Your data on your server.

One install serves unlimited branded status pages, each with its own logo, colour scheme, slug and even a custom domain. Whether you run a homelab, a small-business network or infrastructure for multiple clients, it is designed to alert you before your customers do.

What’s new in v3.4.0

• v3.4.0 · Simplified back to single serverThe HA and auto-failover feature was fully removed. Its operational cost, bidirectional MariaDB replication, a promote webhook, a split-brain guard and a Cloudflare Load Balancer, was out of proportion for a self-hosted monitor. Core behaviour is identical: no migration, no config changes, no downtime to upgrade.
• v3.3.5 · Semver version check fixThe admin UI no longer flags a newer local build as “update available”. Proper numeric semver comparison, plus auto-detection of Portainer-managed containers in the promote script.
• v3.3.2 · GET /health endpointAn unauthenticated liveness probe returning database reachability, poll-loop freshness, uptime and server count. Returns 200 or 503, compatible with Cloudflare LB, AWS ALB and any HTTP uptime monitor.
• v3.3.1 · Security patchReDoS-safe subscribe endpoint, API key names HTML-escaped, and key storage upgraded to HMAC-SHA256.

Read the full release notes →

Built-in check types

Every server can run one or more checks at the same time. All checks record response time per poll, so you can spot degradation before it becomes downtime.

Multi-tenant branded dashboards

This is where Applegate Monitor stands apart from typical uptime tools. From a single deployment you can spin up unlimited branded status pages, each with its own logo, accent colour, background, subtitle, slug and even a fully custom domain.

Viewers assigned to a dashboard see only the servers in their group. Other dashboards, and the servers on them, are completely invisible. Admins see a master view across every group.

Add a custom domain to a group and point DNS at your server. The app reads the Host header and serves the correctly branded dashboard automatically.

Platform features

Embeddable status badges

Drop live SVG badges into READMEs, docs or internal dashboards. No third-party service, no rate limits, no sign-up. Badge URLs are generated inside the server edit form.

# Available badges:
/api/badge/:id/status                 # Up / Down / Degraded
/api/badge/:id/uptime?duration=24h    # Uptime % (24h, 7d, 30d)
/api/badge/:id/ping                   # Latest response time
/api/badge/:id/cert-exp               # SSL certificate expiry

Colour thresholds are sensible out of the box, green at 99% uptime or better, yellow at 95%, red below, and every parameter is overridable via query string.

Who is it for?

Most people only find out their website went down when a friend texts them, or worse, when a customer complains. Downtime costs trust, and trust is hard to rebuild. Applegate Monitor flips that: you get the alert, you investigate, and you fix it before it becomes a headline.

Getting started

Deploy on any Linux host with Docker. A MariaDB container, a session secret and a reverse proxy, Caddy recommended, are all you need.

# Requirements: Docker + Docker Compose. MariaDB runs as a container.

# 1. Clone the repo
git clone https://github.com/X4Applegate/status-server
cd status-server

# 2. Configure your deployment
cp docker-compose.example.yml docker-compose.yml
# Edit docker-compose.yml: DB credentials, SESSION_SECRET, TZ

# 3. Launch
docker compose up -d --build

# 4. Open http://your-server:3000 and create your admin account

On first visit you are prompted to create the admin account. Then create a dashboard, add your servers and share the dashboard URL with viewers. The full setup guide is in the README.

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