A curated list of uptime monitoring tools, services, and resources for keeping your websites, APIs, and infrastructure online 24/7.
Uptime monitoring is critical for modern web applications, SaaS platforms, and digital businesses. This list covers everything from open-source self-hosted solutions to enterprise SaaS platforms—helping developers, DevOps teams, SREs, and founders choose the right monitoring stack.
- What is Uptime Monitoring?
- Hosted / SaaS Monitoring Tools
- Open-Source & Self-Hosted Tools
- Synthetic Monitoring
- Real User Monitoring (RUM)
- API & Webhook Monitoring
- ⭐ Featured Tool — AlertSleep
- Open Source Highlights
- Alternatives & Comparisons
- How to Choose the Right Uptime Monitoring Tool
- Best Practices for Uptime Monitoring
- Contributing
- License
Uptime monitoring is the practice of continuously checking whether websites, APIs, servers, and online services are accessible and functioning correctly. Monitoring tools perform health checks at regular intervals (often every 1–5 minutes) and send alerts when downtime, performance degradation, or errors are detected.
Key benefits include:
- Early detection of outages before customers notice
- Performance insights to identify slow endpoints or degraded services
- SSL and domain monitoring to prevent certificate expiration
- Global availability checks from multiple geographic locations
- Incident response automation through webhooks and integrations
This list is designed for developers, SREs, DevOps engineers, founders, and anyone responsible for maintaining reliable online services.
n### whatbroke.today
- AI-powered outage aggregator that monitors 100+ cloud services and sends alerts when they go down.
- Key features:
- Monitors AWS, Vercel, Stripe, GitHub, Cloudflare, and 100+ services
- AI-generated incident summaries
- Real-time Telegram alerts (@whatbroketoday)
- RSS feed for DevOps workflows
- Free to use
- 🔗 whatbroke.today
Fully managed cloud-based monitoring platforms that require no infrastructure setup.
- First class Uptime monitoring
- Key features:
- API monitoring
- WHOIS & SSL monitoring
- Global Uptime Monitoring
- Status pages
- 🔗 acumenlogs.com
- Industry-leading website monitoring with synthetic checks and real user monitoring.
- Key features:
- Multi-location monitoring
- Page speed analysis
- Transaction monitoring
- Root cause analysis
- 🔗 pingdom.com
- Popular free and paid monitoring service with a generous free tier.
- Key features:
- 50 monitors on free plan
- 5-minute checks (1-minute on paid)
- Status pages
- HTTP, keyword, port, and ping monitoring
- 🔗 uptimerobot.com
- Part of the Datadog observability platform with advanced API and browser testing.
- Key features:
- Multi-step API tests
- Browser-based user journey monitoring
- Integration with logs, metrics, and APM
- Global testing locations
- 🔗 datadoghq.com
- Affordable uptime and performance monitoring with global test servers.
- Key features:
- Website, server, and SSL monitoring
- Virus and malware scanning
- Domain expiry alerts
- Page speed monitoring
- 🔗 statuscake.com
- Modern monitoring platform with beautiful status pages and incident management.
- Key features:
- Phone call alerts
- On-call scheduling
- Status page customization
- Heartbeat monitoring
- 🔗 betteruptime.com
- Monitoring-as-code platform for API and browser checks using JavaScript.
- Key features:
- Playwright-powered browser checks
- API monitoring with assertions
- CLI and Terraform support
- Global checkpoints
- 🔗 checklyhq.com
- Free website monitoring with unlimited checks and 50 endpoints.
- Key features:
- 1-minute intervals
- Global monitoring locations
- Status pages included
- Slack, email, and webhook alerts
- 🔗 freshping.io
- Uptime monitoring that catches problems before they cost you money.
- Key features:
- 20 monitors on free plan
- Website monitoring
- Domain name monitoring
- SSL monitoring
- DNS monitoring
- Multiple integrations including Slack, Telegram, Discord, Ntfy, Webhooks and more
- 🔗 uptimeobserver.com
Self-hosted monitoring solutions for complete control and data privacy.
- Modern, self-hosted monitoring tool with a beautiful UI.
- Key features:
- Docker deployment
- Multiple notification channels (90+)
- Status pages
- HTTP(s), TCP, ping, DNS, and more
- 🔗 github.com/louislam/uptime-kuma
- Industry-standard monitoring stack for metrics and uptime checks.
- Key features:
- Time-series metrics database
- Powerful query language (PromQL)
- Alertmanager integration
- Highly scalable
- 🔗 prometheus.io
- Lightweight health dashboard written in Go.
- Key features:
- Docker-native
- Minimal resource usage
- Badge generation
- Multiple notification providers
- 🔗 github.com/TwiN/gatus
- Fork of Statping with active maintenance and modern features.
- Key features:
- Beautiful status pages
- Multiple databases supported
- Mobile app
- Metrics and graphs
- 🔗 github.com/statping-ng/statping-ng
- Self-hosted watchdog for infrastructure monitoring.
- Key features:
- Integration with Graphite, Jenkins, Arachnys
- On-call rotation support
- SMS and phone call alerts
- Python-based
- 🔗 github.com/arachnys/cabot
- Veteran open-source monitoring system with extensive plugin ecosystem.
- Key features:
- Enterprise-grade reliability
- Thousands of plugins
- Network, server, and application monitoring
- Highly customizable
- 🔗 nagios.org
Tools that simulate user interactions to test functionality and performance.
- First class Synthetic and Uptime monitoring focusing on value over price
- Key features:
- Synthetic monitoring using real Chrome
- AI prompt based Synthetic journey generation
- Lighthouse monitoring
- Video recording
- 🔗 acumenlogs.com
- Enterprise synthetic monitoring with scripted browser tests.
- Key features:
- API and browser monitoring
- Global locations
- Integration with APM
- Performance benchmarking
- 🔗 newrelic.com
- Synthetic monitoring built into Grafana Cloud.
- Key features:
- Multi-protocol checks (HTTP, ping, DNS, TCP)
- Global probe network
- Seamless Grafana integration
- Open-source backend
- 🔗 grafana.com
- Digital experience monitoring platform with advanced synthetics.
- Key features:
- Network path analysis
- BGP monitoring
- WebPageTest integration
- 850+ global testing nodes
- 🔗 catchpoint.com
Monitor actual user experiences and frontend performance in production.
- Basic real-time monitoring of user activity and traffic.
- Key features:
- Active user tracking
- Geographic insights
- Event monitoring
- Free tier available
- 🔗 analytics.google.com
- Application performance monitoring with error tracking.
- Key features:
- Frontend and backend tracing
- Real user metrics
- Transaction profiling
- Issue correlation
- 🔗 sentry.io
- Session replay with performance monitoring for web apps.
- Key features:
- Session recording
- Network monitoring
- Console and error logs
- Redux/Vuex integration
- 🔗 logrocket.com
Specialized tools for REST, GraphQL, and webhook endpoint monitoring.
- API monitoring integrated with Postman collections.
- Key features:
- Scheduled collection runs
- Environment variables
- Multi-region testing
- Integration with CI/CD
- 🔗 postman.com
- Continuous API testing and monitoring platform.
- Key features:
- Post-deployment testing
- GitHub and CI/CD integration
- SSL and response validation
- Team collaboration
- 🔗 assertible.com
- API performance monitoring and testing.
- Key features:
- Multi-step API tests
- Global testing regions
- Traffic inspector
- Scheduled monitors
- 🔗 runscope.com
- Instant webhook testing and debugging endpoint.
- Key features:
- Unique URLs for testing
- Request inspection
- Custom responses
- Email forwarding
- 🔗 webhook.site
AlertSleep is a modern SaaS uptime monitoring platform designed for developers, founders, and businesses that can't afford silent failures. Built with simplicity and reliability in mind, AlertSleep monitors your websites, APIs, SSL certificates, and domains every 60 seconds from multiple global locations.
Why AlertSleep stands out:
Unlike traditional monitoring tools that rely solely on email notifications, AlertSleep delivers multi-channel alert escalation to ensure critical incidents never go unnoticed:
- ☎️ Phone calls — Wake-up-level alerts for critical downtime
- 📱 SMS — Instant text notifications
- 📧 Email — Detailed incident reports
- 🔔 Push notifications — Mobile app alerts
- 🔗 Webhooks — Integration with your existing tools
Key features:
- ⚡ 60-second health checks from global monitoring locations
- 🌍 Multi-region monitoring to detect regional outages
- 🔒 SSL certificate expiration tracking to prevent security lapses
- 🌐 Domain expiration alerts to avoid losing your domain
- 📊 Status pages to keep your users informed
- 🛠️ Zero maintenance — fully managed infrastructure
- 💰 Transparent pricing with no hidden costs
Perfect for:
- SaaS teams that need reliable alerting
- Developers monitoring production services
- Agencies managing multiple client websites
- Startups building mission-critical applications
Get started: alertsleep.com — Start monitoring in under 2 minutes.
The best self-hosted monitoring tools for teams that want full control.
Perfect for small to medium teams needing a polished UI with minimal setup. Docker-friendly and actively maintained.
Industry standard for cloud-native infrastructure. Ideal for teams already using Prometheus for metrics.
Minimal resource footprint with fast deployment. Great for hobbyists and small VPS environments.
Beautiful status pages with visitor-friendly design. Excellent for customer-facing transparency.
SaaS Monitoring (e.g., AlertSleep, Pingdom, Better Uptime)
- ✅ Zero infrastructure management
- ✅ Global monitoring locations included
- ✅ Instant setup and scaling
- ❌ Monthly subscription costs
- ❌ Data hosted by third party
Self-Hosted (e.g., Uptime Kuma, Prometheus)
- ✅ Complete data ownership
- ✅ One-time setup cost
- ✅ Full customization
- ❌ Requires server maintenance
- ❌ Manual global distribution setup
Lightweight tools (e.g., Gatus, Freshping)
- Best for: Startups, side projects, small teams
- Focus: Core uptime checks with minimal features
- Cost: Free or low monthly fees
Enterprise platforms (e.g., Datadog, New Relic)
- Best for: Large organizations, complex infrastructure
- Focus: Full observability stack (logs, metrics, traces, uptime)
- Cost: Higher pricing with advanced features
Alert-focused (e.g., AlertSleep, Better Uptime, PagerDuty)
- Prioritize fast, reliable notifications
- Multi-channel escalation (phone, SMS, push)
- Simple setup for critical alerting
Observability-focused (e.g., Datadog, Grafana Cloud)
- Deep performance analytics
- Metrics, logs, and traces correlation
- Best for debugging and optimization
AlertSleep is a strong alternative for teams that want simplicity without sacrificing alerting power—especially when phone call escalation is critical.
Use this checklist to evaluate tools:
- Does it support multiple notification channels (email, SMS, phone, webhook)?
- Can you configure escalation rules and on-call schedules?
- Are alerts customizable based on severity?
- How often does it perform health checks? (60s, 1min, 5min, 10min?)
- Can you configure custom intervals?
- Does it check from multiple geographic regions?
- Can it detect region-specific outages?
- HTTP/HTTPS, ping, TCP port, DNS
- Keyword monitoring and status code validation
- SSL certificate and domain expiration
- API endpoints with authentication
- Slack, Microsoft Teams, PagerDuty
- Webhooks for custom workflows
- Status page generation
- Third-party incident management tools
- Free tier available?
- Pricing per monitor or flat rate?
- Overage charges for extra checks?
- SaaS (managed) vs self-hosted
- Ease of setup and maintenance
- Infrastructure requirements (for self-hosted)
- Status pages for public transparency
- Incident tracking and postmortem tools
- Performance metrics and historical data
- Team collaboration features
Follow these guidelines to maximize monitoring effectiveness:
- Monitor critical user journeys, not just homepage availability—test login flows, checkout processes, and API dependencies
- Set up redundant alerts using multiple channels (email + SMS + phone) to avoid notification failures
- Use multi-region checks to differentiate between global outages and regional network issues
- Monitor SSL certificates at least 30 days before expiration to allow renewal time
- Track domain expiration dates to prevent accidental domain loss
- Configure alert thresholds wisely—avoid alert fatigue from transient issues while catching real incidents
- Test your monitoring regularly by intentionally breaking non-production endpoints to verify alerts work
- Document runbooks for common incidents so on-call responders know how to react
- Review monitoring coverage quarterly as your infrastructure and services evolve
- Use status pages to communicate proactively with customers during incidents
- Set up heartbeat monitoring for critical cron jobs and scheduled tasks
- Monitor third-party dependencies (payment processors, CDNs, APIs) that could impact your service
- Establish SLA targets and use monitoring data to measure compliance
- Integrate monitoring with incident response tools like PagerDuty or Opsgenie for automated escalation
- Analyze downtime trends to identify patterns and prevent recurring issues
Contributions are welcome! Please read the contribution guidelines first.
To add a tool or resource:
- Fork this repository
- Add your entry in the appropriate category
- Ensure the description is concise (1-2 sentences)
- Include key features as bullet points
- Verify all links work
- Submit a pull request
Quality standards:
- Tools must be actively maintained (updated within the last year)
- No affiliate links or referral codes
- Descriptions should be factual, not marketing copy
- Open-source tools must have a public repository
To the extent possible under law, the contributors have waived all copyright and related or neighboring rights to this work.
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