UptimeSignal

What UptimeSignal is

UptimeSignal is a synthetic monitoring service for developers who need to check websites, APIs, webhooks, and other HTTP endpoints from outside their own infrastructure. Its checks measure response time and inspect HTTP status and response body, along with SSL certificates, DNS resolution, and TLS handshakes. Email, Slack, Discord, Telegram, and webhook alerts are available on every plan, including notifications when a service recovers. To reduce false alarms, UptimeSignal waits for two consecutive failures before alerting.

Each plan includes unlimited public status pages with incident timelines, component groups, and uptime history bars. Webhooks can update component status, open incidents, and resolve issues; named integrations include GitHub Actions, GitLab CI, Jenkins, and PagerDuty. A REST API and MCP server let compatible AI agents create monitors, check uptime, and manage alerts and status pages. The free plan allows commercial use and has no credit card requirement. Pro adds faster checks, 90-day uptime history, priority support, custom domains, and the option to remove UptimeSignal branding. It also includes lightweight error and event tracking sent by JSON HTTP request; the maker describes this as distinct from a full APM or tracing suite.

Who it suits

UptimeSignal suits developers who want external checks for websites, APIs, webhooks, or other HTTP endpoints, alongside public status pages and multi-channel alerts. Its free commercial plan can fit smaller monitoring needs, while Pro is for users who need more monitors, faster intervals, custom domains, or event tracking.

Limits

Free includes 25 monitors with five-minute check intervals, and its status pages use a UptimeSignal subdomain with UptimeSignal branding. Pro is billed annually at $120/year and includes unlimited monitors, one-minute intervals, and 90-day uptime history.

Getting started

1. Open https://uptimesignal.io/.
2. Choose the Free plan or Pro plan.
3. Use the web service or API to create monitors for endpoints.
4. Set up email, Slack, Discord, Telegram, or webhook alerts.
5. Create a public status page; choose Pro for a custom domain or removal of UptimeSignal branding.

Verdict

Choose UptimeSignal if you want endpoint monitoring and unlimited public status pages, with alert channels included even on the free plan. Pro is the route to unlimited monitors, one-minute checks, custom domains, and lightweight event tracking. The free plan has 25 monitors and five-minute intervals, and its status pages use a UptimeSignal subdomain with branding.