Side by side

Uptime Cairn vs Uptime Monitor

Both stand on website monitoring software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Uptime Cairn

Free plan APILinuxSelf-hosted+1

Uptime Cairn offers broad monitoring, alerting, reporting, and status-page features in a self-hosted package. Its lack of a hosted tier and the listed unshipped features matter if you need those capabilities.

Visit Uptime Cairn

Uptime Monitor

Free plan APISelf-hostedWeb

Uptime Monitor provides broad protocol monitoring, grouped health views, status pages, and alert routing in a self-hosted package. Its retention periods differ by data granularity, while deployment and ongoing infrastructure remain your responsibility.

Visit Uptime Monitor

The facts

	Uptime Cairn	Uptime Monitor
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	API, Linux, Self-hosted, Web	API, Self-hosted, Web
Lowest paid plan	Free or on request	Not published
Plans published	1	None
Maker	Not published	Not published
Website	uptimecairn.dev	uptime-monitor.org
On website monitoring software	#18 of 55	#36 of 55

Uptime Cairn: what it does well

Supports a wide range of network and service checks.
Status pages allow custom domains and branding.
Provides a REST API and scheduled reports.
No features are held back for a paid tier.

What to know first

There is no hosted tier.
Multi-region probing, SSO, and synthetic browser flows have not shipped.
The site recommends a reverse proxy before internet exposure.

Uptime Monitor: what it does well

Monitors 17 protocols
Self-hosted with no external tracking
Real-time WebSocket status updates
Responsive, customizable status pages
Distributed checks from multiple locations

What to know first

Requires self-hosted deployment
Raw pulse history lasts 24 hours
Uses GPL-3.0 licensing
Configuration and infrastructure are user-managed

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