Monitor. Detect. Resolve.
FourSight monitors your websites, APIs, and infrastructure from 4 global regions every 30 seconds. Get instant alerts via email, Slack, webhooks, or SMS — and keep your users informed with branded status pages.
No credit card required · 10 free monitors forever
7 Monitor Types, 4 Global Regions
Comprehensive monitoring for every layer of your stack — validated from multiple continents simultaneously.
HTTP(s) Monitoring
Monitor any URL with configurable methods, headers, and expected status codes. Validate response times from 4 global regions.
Keyword Monitoring
Verify specific content exists (or doesn't) on your pages. Catch defacements, missing content, or unexpected changes.
SSL Certificate Monitoring
Track certificate expiration, issuer changes, and validity. Get alerts before your certs expire.
DNS Monitoring
Verify DNS records resolve correctly across regions. Catch propagation issues and unauthorized changes.
Domain Expiry Monitoring
Never lose a domain. Get notified well before your domain registrations expire.
Ping Monitoring
ICMP-based monitoring to verify host reachability from multiple global vantage points.
Port Monitoring
Check that specific TCP ports are open and responding. Monitor databases, mail servers, and custom services.
Up and Running in Minutes
Three simple steps to global uptime monitoring.
Add Your Monitors
Enter URLs, domains, or IPs. Configure check types, intervals, and alert preferences.
We Check Globally
FourSight validates from 4 regions every 30 seconds. Multi-region consensus eliminates false positives.
Get Alerted Instantly
When downtime is confirmed, receive alerts via email, Slack, webhooks, or SMS within seconds.
Never Miss Downtime
Get notified through the channels your team already uses.
Instant email alerts with incident details and recovery notifications.
Slack
Real-time Slack notifications to your team's channels.
Webhooks
Push incident data to any endpoint for custom integrations.
SMS
Critical alerts via text message so you never miss downtime.
Everything You Need to Stay Online
Beyond monitoring — FourSight is a complete incident and status management platform.
Public Status Pages
Branded, customizable status pages to keep your users informed during incidents.
Maintenance Windows
Schedule maintenance periods to suppress alerts and show planned downtime on status pages.
Incident Management
Automatic incident creation, timeline tracking, and resolution workflows.
Multi-Region Consensus
Checks from 4 global regions prevent false positives. Incidents only trigger when multiple regions confirm.
Organizations & Teams
Invite team members, manage roles, and collaborate on monitoring across your organization.
30-Second Intervals
Check as frequently as every 30 seconds for near-instant downtime detection.
Simple, Transparent Pricing
Start free. Scale when you're ready. No surprises.
Free
For side projects and personal sites.
Starter
For indie devs & small SaaS teams.
Growth
For teams that need comprehensive monitoring.
Pro
For funded startups and agencies.
- Up to 250 monitors (expandable)
- All 7 monitor types
- 30-second check intervals
- Multi-region validation (4 regions)
- Email, Slack, Webhook & SMS alerts
- Up to 10 status pages with custom CSS
- 90-day history & charts
- Advanced incident timelines
- Unlimited escalation policies
- Maintenance windows (one-time & recurring)
- Multi-user orgs with role-based access
- Priority support
Scale
For agencies and serious SaaS teams.
- 500+ monitors
- All 7 monitor types
- 15-second check intervals
- Multi-region validation (4 regions)
- All alert channels + phone support
- Up to 25 status pages with custom domains
- 1-year history & charts
- SLA guarantee
- White-label status pages
- Unlimited escalation policies
- Multi-user orgs with role-based access
- Dedicated support