Overview
Uptime Kuma is an open-source, self-hosted website uptime monitoring tool released in 2021 under the MIT license, created and maintained by developer Louis Lam. With one-click Docker deployment, Uptime Kuma can be fully operational in under 5 minutes. It supports 20+ monitor types including HTTP(S), Ping, TCP ports, DNS queries, SSL certificate expiry, and game servers (Minecraft, Valheim, etc.).
As an open-source project, Uptime Kuma has earned 50,000+ GitHub Stars with an active community. Built with Vue.js + Node.js, its responsive interface works on both desktop and mobile devices. No commercial license or subscription is required.
Key Strengths
- Completely Open-Source Free: MIT license — no paywalls, no feature limits, no user restrictions. All features are free including 3 areas: status pages, alert notifications, and API access. See Monitoring & Alerting Guide.
- One-Click Docker Deployment: Run
docker run -d --restart=always -p 3001:3001 louislam/uptime-kumaand you're done. Supports Docker Compose, Kubernetes, Synology NAS, and Unraid. Refer to the Uptime Kuma Deployment Guide. - 20+ Monitor Types: HTTP(S), Ping, TCP/UDP ports, DNS, SSL certificates, SMTP, POP3, IMAP, game servers (Minecraft, Valheim, FiveM, TeamSpeak 3), Docker container status, and Kubernetes Pod health checks.
- Beautiful Status Pages: Built-in status page generator with 4 options — custom domains, logos, theme colors, and announcements. Status pages reflect availability and response times of all monitors in real time.
Product Ecosystem
Monitoring Dashboard
The main UI displays all monitor statuses as cards with grouping, tags, and search sorting. Each monitor shows current status, response time, SSL days-to-expiry, and 24-hour availability, with daily/weekly/monthly/yearly response time charts.
Alert Notifications
Supports 90+ notification channels including Telegram, Discord, Slack, Pushover, Gotify, email (SMTP), Webhook, DingTalk, WeCom, and Bark. Each monitor can have independent alert rules and notification channels.
API & Reverse Proxy
Provides a RESTful API for managing monitors and fetching status data. Supports Nginx/Caddy reverse proxy configuration and automatic SSL certificates via Let's Encrypt.
Limitations
- Self-Hosting Required: Uptime Kuma requires users to maintain the server, database (SQLite), and network. There is no managed SaaS alternative; monitoring goes down if the server fails.
- Complex High Availability: Default single-node deployment has SPOF risk. Building master-slave architecture requires manual database replication and load balancing.
- Limited Alert Channels: No phone voice or SMS alerting. Notifications rely on push, Webhook, and email.
- No Advanced Analytics: Lacks ML anomaly detection, SLO management, and capacity planning — best for basic monitoring scenarios.
Use Cases
- Individual Developers / Webmasters (Rating ★★★★★): Zero-cost self-hosted monitoring fully covering personal website and app needs.
- Budget-Conscious Small Teams (Rating ★★★★): A complete monitoring + status page solution without subscription cost.
- Education & Experimentation (Rating ★★★★): Ideal for learning monitoring concepts and self-hosting practice. See the deployment tutorial.
- Full Data Control (Rating ★★★★): Data stays entirely in your own datacenter or VPS with no data-leak risk.
- Large Enterprise Production (Rating ★★★): Prefer more mature commercial solutions; if self-hosting is required, consider Zabbix or Prometheus + Grafana.
Pricing
| Item | Cost | Notes |
|---|---|---|
| Software license | $0 | MIT open-source license, completely free |
| Server | Varies | Runs on a $5-10/month VPS at minimum |
| Domain (optional) | $10-15/year | For custom status page domain |
| SSL certificate | $0 | Free via Let's Encrypt |
FAQ
- How does Uptime Kuma differ from commercial monitoring tools? Uptime Kuma is completely open-source and free but requires self-hosting. Commercial tools (e.g., Better Stack, Pingdom) offer managed SaaS without self-maintenance but require paid subscriptions; compare in cloud monitoring services comparison.
- How many monitors can Uptime Kuma support? No hard limit; it depends on server performance. A standard VPS (2-core/2GB) can stably run 100+ monitors; see the Uptime Kuma deployment guide.
- Where is Uptime Kuma data stored? By default in a local SQLite database on the server, fully under user control; see the data compliance checklist.
- What alerting does Uptime Kuma offer? 90+ notification channels including Telegram, Discord, Slack, Pushover, Gotify, email (SMTP), Webhook, DingTalk, WeCom, and Bark. See monitoring & alerting.